Table of Contents
- About this manual
- Chapter 1. Important safety information
- Chapter 2. Important service information
- Chapter 3. Product overview
- Chapter 4. Service checkout and symptom-to-FRU index
- Chapter 5. Troubleshooting, diagnostics, and recovery
- Chapter 6. Hardware removal and installation
- Handling static-sensitive devices
- Service tool kit
- Major FRUs and CRUs
- System board
- Removing and installing hardware
- External options
- Computer stand
- Rear cover
- Optical drive
- Optical drive holder
- System board shield
- VESA mount bracket cover
- VESA mount bracket
- Storage drive and storage drive bracket
- System fan
- Heat sink
- Bump cover
- M.2 solid-state drive
- Microprocessor
- Serial connector module
- Cable cover
- Memory module
- Wi-Fi card
- Coin-cell battery
- Cover presence switch (intrusion switch)
- E-Privacy button board (M90a)
- Card reader
- System board
- Internal speakers
- I/O brackets (M90a)
- Integrated camera and microphone module
- Main frame
- Front decoration cover
- Wi-Fi antennas
- LCD bracket and LCD panel
- Appendix A. Notices and trademarks
Lenovo M90a User Manual
Displayed below is the user manual for M90a by Lenovo which is a product in the All-in-One PCs/Workstations category. This manual has pages.
Related Manuals
M70a and M90a
Hardware Maintenance Manual
Read this first
Before using this documentation and the product it supports, ensure that you read and understand the
following:
• Chapter 1 “Important safety information” on page 1
• Safety and Warranty Guide
• Setup Guide
Third Edition (January 2021)
© Copyright Lenovo 2021.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.
Contents
About this manual . . . . . . . . . . . . iii
Chapter 1. Important safety
information. . . . . . . . . . . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 2
Safety inspection guide . . . . . . . . . . . . . 3
Handling electrostatic discharge-sensitive
devices . . . . . . . . . . . . . . . . . . . 4
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multi-lingual translations) . . . . . . 4
Chapter 2. Important service
information. . . . . . . . . . . . . . . 27
Strategy for replacing FRUs . . . . . . . . . . 27
Strategy for replacing a hard disk drive or a
solid-state drive . . . . . . . . . . . . . 27
Important notice for replacing a system
board . . . . . . . . . . . . . . . . . 27
How to use error codes . . . . . . . . . . 28
Strategy for replacing FRUs for CTO, special-bid,
and standard models. . . . . . . . . . . . . 28
Product definition . . . . . . . . . . . . 28
FRU identification . . . . . . . . . . . . 28
Chapter 3. Product overview . . . . . 29
Front . . . . . . . . . . . . . . . . . . . 29
Rear . . . . . . . . . . . . . . . . . . . 31
Chapter 4. Service checkout and
symptom-to-FRU index . . . . . . . . 33
Service checkout . . . . . . . . . . . . . . 33
Problem determination tips . . . . . . . . 33
Symptom-to-FRU index . . . . . . . . . . . 34
Hard disk drive boot error . . . . . . . . . 34
Power supply problems . . . . . . . . . . 35
Beep symptoms . . . . . . . . . . . . . 35
POST error codes . . . . . . . . . . . . 35
Miscellaneous error conditions . . . . . . . 36
Undetermined problems . . . . . . . . . 38
Chapter 5. Troubleshooting,
diagnostics, and recovery . . . . . . . 41
Basic procedure for resolving computer
problems . . . . . . . . . . . . . . . . . 41
Troubleshooting . . . . . . . . . . . . . . 41
Startup problems . . . . . . . . . . . . 42
Screen problems . . . . . . . . . . . . 43
Audio problems . . . . . . . . . . . . . 44
Network problems . . . . . . . . . . . . 44
Performance problems . . . . . . . . . . 47
Storage drive problems . . . . . . . . . . 48
CD or DVD problems . . . . . . . . . . . 48
Serial connector problems . . . . . . . . . 49
USB device problems . . . . . . . . . . 49
Software problems. . . . . . . . . . . . 50
Diagnostics . . . . . . . . . . . . . . . . 50
Lenovo diagnostic tools . . . . . . . . . . 50
Recovery . . . . . . . . . . . . . . . . . 50
Restore system files and settings to an earlier
point . . . . . . . . . . . . . . . . . 50
Restore your files from a backup . . . . . . 50
Reset your computer . . . . . . . . . . . 50
Use advanced options . . . . . . . . . . 51
Windows automatic recovery. . . . . . . . 51
Create and use a recovery USB device . . . . 51
Update the device driver . . . . . . . . . 52
Chapter 6. Hardware removal and
installation . . . . . . . . . . . . . . . 53
Handling static-sensitive devices . . . . . . . . 53
Service tool kit . . . . . . . . . . . . . . . 53
Major FRUs and CRUs . . . . . . . . . . . . 54
System board . . . . . . . . . . . . . . . 59
Removing and installing hardware . . . . . . . 60
External options . . . . . . . . . . . . . 61
Computer stand . . . . . . . . . . . . . 61
Rear cover . . . . . . . . . . . . . . . 65
Optical drive . . . . . . . . . . . . . . 66
Optical drive holder . . . . . . . . . . . 69
System board shield . . . . . . . . . . . 71
VESA mount bracket cover . . . . . . . . 74
VESA mount bracket . . . . . . . . . . . 76
Storage drive and storage drive bracket . . . 78
System fan . . . . . . . . . . . . . . . 83
Heat sink . . . . . . . . . . . . . . . 85
Bump cover . . . . . . . . . . . . . . 88
M.2 solid-state drive . . . . . . . . . . . 90
Microprocessor . . . . . . . . . . . . . 94
Serial connector module . . . . . . . . . 100
Cable cover . . . . . . . . . . . . . . 102
Memory module . . . . . . . . . . . . . 104
Wi-Fi card . . . . . . . . . . . . . . . 107
Coin-cell battery. . . . . . . . . . . . . 110
Cover presence switch (intrusion switch) . . . 113
E-Privacy button board (M90a) . . . . . . . 115
© Copyright Lenovo 2021 i
Card reader . . . . . . . . . . . . . . 116
System board. . . . . . . . . . . . . . 119
Internal speakers . . . . . . . . . . . . 122
I/O brackets (M90a) . . . . . . . . . . . 124
Integrated camera and microphone
module . . . . . . . . . . . . . . . . 127
Main frame . . . . . . . . . . . . . . . 130
Front decoration cover . . . . . . . . . . 133
Wi-Fi antennas . . . . . . . . . . . . . 136
LCD bracket and LCD panel . . . . . . . . 139
Appendix A. Notices and
trademarks. . . . . . . . . . . . . . . 143
ii M70a and M90a Hardware Maintenance Manual
About this manual
This manual provides service and reference information for ThinkCentre® computers listed on the front cover.
Illustrations in this manual might look different from your product.
Use this manual along with the advanced diagnostic tests to troubleshoot problems.
Important: This manual is intended only for trained service technicians who are familiar with ThinkCentre
computers. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively.
Before servicing a ThinkCentre computer, be sure to read and understand Chapter 1 “Important safety
information” on page 1.
© Copyright Lenovo 2021 iii
iv M70a and M90a Hardware Maintenance Manual
Chapter 1. Important safety information
General safety
Follow these rules to ensure general safety:
• Observe good housekeeping in the area of the machines during and after maintenance.
• When lifting any heavy object:
1. Ensure you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the
muscles in your back.
Attention: Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects that you
think are too heavy for you.
• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.
• Before you start the machine, ensure that other service representatives and the customer's personnel are
not in a hazardous position.
• Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the
machine.
• Keep your tool case away from walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves
are fastened or rolled up above your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, approximately
8 centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Remember: Metal objects are good electrical conductors.
• Wear safety glasses when you are: hammering, drilling, soldering, cutting wire, attaching springs, using
solvents, or working in any other conditions that might be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that
is worn or defective.
• Reinstall all covers correctly before returning the machine to the customer.
CAUTION:
Keep fingers and other parts of your body away from hazardous, moving parts. If you suffer an injury,
seek medical care immediately.
CAUTION:
Avoid contact with hot components inside the computer. During operation, some components
become hot enough to burn the skin. Before you open the computer cover, turn off the computer,
disconnect power, and wait approximately 10 minutes for the components to cool.
© Copyright Lenovo 2021 1
Electrical safety
CAUTION:
Electrical current from power, telephone, and communication cables can be hazardous. To avoid
personal injury or equipment damage, disconnect the attached power cords, telecommunication
systems, networks, and modems before you open the computer covers, unless instructed otherwise
in the installation and configuration procedures.
Observe the following rules when working on electrical equipment.
Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft
material that does not insulate you when working with live electrical currents. Many customers have, near
their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.
Do not use this type of mat to protect yourself from electrical shock.
• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
• Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing Field Replaceable Units (FRUs)
• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the machine and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
Remember: Another person must be there to switch off the power, if necessary.
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your
pocket or behind your back.
Remember: There must be a complete circuit to cause electrical shock. By observing the above rule,
you may prevent a current from passing through your body.
– When using a tester, set the controls correctly and use the approved probe leads and accessories for
that tester.
– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages; these instructions are in
the safety sections of maintenance information. Use extreme care when measuring high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check that it has been powered-off.
• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,
nongrounded power extension cables, power surges, and missing safety grounds.
• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and machine damage.
2M70a and M90a Hardware Maintenance Manual
• Do not service the following parts with the power on when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
and similar units. (This practice ensures correct grounding of the units.)
• If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.
Safety inspection guide
The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these
products. Each machine, as it was designed and built, had required safety items installed to protect users
and service personnel from injury. This guide addresses only those items. However, good judgment should
be used to identify potential safety hazards due to attachment of features or options not covered by this
inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal
electrical shock).
• Explosive hazards, such as a damaged CRT face or bulging capacitor
• Mechanical hazards, such as loose or missing hardware
The guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and the
power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power-off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external ground pin and frame ground.
b. The power cord should be the appropriate type as specified in the parts listings.
c. Insulation must not be frayed or worn.
4. Remove the cover.
5. Check for any obvious alterations. Use good judgment as to the safety of any alterations.
6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or
other liquids, or signs of fire or smoke damage.
7. Check for worn, frayed, or pinched cables.
Chapter 1.Important safety information 3
8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered
with.
Handling electrostatic discharge-sensitive devices
Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to
electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.
Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the
person handling the part are all at the same charge.
Notes:
1. Use product-specific ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.
When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people while handling the part.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when
you are wearing a wrist strap.
• Use the black side of a grounded work mat to provide a static-free work surface. The mat is especially
useful when handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the specific
service requirement.
Note: The use of a grounding system is desirable but not required to protect against ESD damage.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
– Use an ESD common ground or reference point when working on a double-insulated or battery-
operated system. You can use coax or connector-outside shells on these systems.
– Use the round ground-prong of the ac plug on ac-operated computers.
Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a certified electrician.
Safety notices (multi-lingual translations)
The caution and danger safety notices in this section are provided in the following languages:
• English
• Arabic
• Brazilian/Portuguese
• Chinese (simplified)
• Chinese (traditional)
• French
• German
• Hebrew
4M70a and M90a Hardware Maintenance Manual
• Italian
• Korean
• Spanish
DANGER
Electrical current from power, telephone and communication cables is hazardous.
To avoid a shock hazard:
• Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
• Connect all power cords to a properly wired and grounded electrical outlet.
• Connect to properly wired outlets any equipment that will be attached to this product.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• Disconnect the attached power cords, telecommunications systems, networks, and modems
before you open the device covers, unless instructed otherwise in the installation and configuration
procedures.
• Connect and disconnect cables as described in the following tables when installing, moving, or
opening covers on this product or attached devices.
To Connect To Disconnect
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlet.
5. Turn device ON.
1. Turn everything OFF.
2. First, remove power cords from outlet.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
CAUTION:
When replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery
recommended by the manufacturer. If your system has a module containing a lithium battery, replace
it only with the same module type made by the same manufacturer. The battery contains lithium and
can explode if not properly used, handled, or disposed of. Do not:
• Throw or immerse into water
• Heat to more than 100°C (212°F)
• Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
Chapter 1.Important safety information 5
CAUTION:
When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are
installed, note the following:
• Do not remove the covers. Removing the covers of the laser product could result in exposure to
hazardous laser radiation. There are no serviceable parts inside the device.
• Use of controls or adjustments or performance of procedures other than those specified herein
might result in hazardous radiation exposure.
DANGER
Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following:
Laser radiation when open. Do not stare into the beam, do not view directly with optical
instruments, and avoid direct exposure to the beam.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CAUTION:
Use safe practices when lifting.
CAUTION:
The power control button on the device and the power switch on the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one power cord. To
remove all electrical current from the device, ensure that all power cords are disconnected from the
power source.
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6M70a and M90a Hardware Maintenance Manual
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
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8M70a and M90a Hardware Maintenance Manual
PERIGO
A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa.
Para evitar risco de choque elétrico:
• Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste
produto durante uma tempestade com raios.
• Conecte todos os cabos de alimentação a tomadas elétricas corretamente instaladas e aterradas.
• Todo equipamento que for conectado a este produto deve ser conectado a tomadas corretamente
instaladas.
• Quando possível, utilize apenas uma das mãos para conectar ou desconectar cabos de sinal.
• Nunca ligue nenhum equipamento quando houver evidência de fogo, água ou danos estruturais.
• Antes de abrir tampas de dispositivos, desconecte cabos de alimentação, sistemas de telecomunicação,
redes e modems conectados, a menos que especificado de maneira diferente nos procedimentos de
instalação e configuração.
• Conecte e desconecte os cabos conforme descrito na tabela apresentada a seguir ao instalar, mover ou
abrir tampas deste produto ou de dispositivos conectados.
Para Conectar: Para Desconectar:
1. DESLIGUE Tudo.
2. Primeiramente, conecte todos os cabos aos
dispositivos.
3. Conecte os cabos de sinal aos conectores.
4. Conecte os cabos de alimentação às tomadas.
5. LIGUE os dispositivos.
1. DESLIGUE Tudo.
2. Primeiramente, remova os cabos de alimentação das
tomadas.
3. Remova os cabos de sinal dos conectores.
4. Remova todos os cabos dos dispositivos.
CUIDADO:
Ao substituir a bateria de lítio, utilize apenas uma bateria com Número de Peça 45C1566 ou um tipo de
bateria equivalente recomendado pelo Se o seu sistema possui um módulo com uma bateria de lítio,
substitua-o apenas por um módulo do mesmo tipo e do mesmo fabricante. A bateria contém lítio e
pode explodir se não for utilizada, manuseada ou descartada de maneira correta.
Não:
• Jogue ou coloque na água
• Aqueça a mais de 100°C (212°F)
• Conserte nem desmonte
Descarte a bateria conforme requerido pelas leis ou regulamentos locais.
PRECAUCIÓN:
Chapter 1.Important safety information 9
Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de fibra ótica
ou transmissores) estiverem instalados, observe o seguinte:
• Não remova as tampas. A remoção das tampas de um produto a laser pode resultar em exposição
prejudicial à radiação de laser. Não existem peças que podem ser consertadas no interior do dispositivo.
• A utilização de controles ou ajustes ou a execução de procedimentos diferentes dos especificados aqui
pode resultar em exposição prejudicial à radiação.
PERIGO
Alguns produtos a laser contêm diodo de laser integrado da Classe 3A ou da Classe 3B. Observe o seguinte:
Radiação a laser quando aberto. Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e
evite exposição direta ao feixe.
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
CUIDADO:
Utilize procedimentos de segurança para levantar equipamentos.
CUIDADO:
O botão de controle de alimentação do dispositivo e o botão para ligar/desligar da fonte de alimentação não
desligam a corrente elétrica fornecida ao dispositivo. O dispositivo também pode ter mais de um cabo de
alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de
alimentação estejam desconectados da fonte de alimentação.
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10 M70a and M90a Hardware Maintenance Manual
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DANGER
Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter
un danger.
Pour éviter tout risque de choc électrique :
• Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration
de ce produit au cours d'un orage.
• Branchez tous les cordons d'alimentation sur un socle de prise de courant correctement câblé et mis à la
terre.
• Branchez sur des socles de prise de courant correctement câblés tout équipement connecté à ce produit.
• Lorsque cela est possible, n'utilisez qu'une seule main pour connecter ou déconnecter les câbles
d'interface.
• Ne mettez jamais un équipement sous tension en cas d'incendie ou d'inondation, ou en présence de
dommages matériels.
• Avant de retirer les carters de l'unité, mettez celle-ci hors tension et déconnectez ses cordons
d'alimentation, ainsi que les câbles qui la relient aux réseaux, aux systèmes de télécommunication et aux
modems (sauf instruction contraire mentionnée dans les procédures d'installation et de configuration).
• Lorsque vous installez, que vous déplacez, ou que vous manipulez le présent produit ou des
périphériques qui lui sont raccordés, reportez-vous aux instructions ci-dessous pour connecter et
déconnecter les différents cordons.
14 M70a and M90a Hardware Maintenance Manual
Connexion Déconnexion
1. Mettez les unités HORS TENSION.
2. Commencez par brancher tous les cordons sur les
unités.
3. Branchez les câbles d'interface sur des
connecteurs.
4. Branchez les cordons d'alimentation sur des prises.
5. Mettez les unités SOUS TENSION.
1. Mettez les unités HORS TENSION.
2. Débranchez les cordons d'alimentation des prises.
3. Débranchez les câbles d'interface des connecteurs.
4. Débranchez tous les câbles des unités.
ATTENTION:
Remplacer la pile au lithium usagée par une pile de référence identique exclusivement, (référence
45C1566), ou suivre les instructions du fabricant qui en définit les équivalences. Si votre système est
doté d'un module contenant une pile au lithium, vous devez le remplacer uniquement par un module
identique, produit par le même fabricant. La pile contient du lithium et peut exploser en cas de
mauvaise utilisation, de mauvaise manipulation ou de mise au rebut inappropriée.
Ne pas :
• la jeter à l'eau,
• l'exposer à des températures supérieures à 100°C,
• chercher à la réparer ou à la démonter.
Ne pas mettre la pile à la poubelle. Pour la mise au rebut, se reporter à la réglementation en vigueur.
ATTENTION:
Si des produits à laser (tels que des unités de CD-ROM, de DVD-ROM, des unités à fibres optiques, ou
des émetteurs) sont installés, prenez connaissance des informations suivantes :
• Ne retirez pas le carter. En ouvrant l'unité de CD-ROM ou de DVD-ROM, vous vous exposez au
rayonnement dangereux du laser. Aucune pièce de l'unité n'est réparable.
• Pour éviter tout risque d'exposition au rayon laser, respectez les consignes de réglage et
d'utilisation des commandes, ainsi que les procédures décrites dans le présent manuel.
DANGER
Certains produits à laser contiennent une diode à laser intégrée de classe 3A ou 3B. Prenez
connaissance des informations suivantes:
Rayonnement laser lorsque le carter est ouvert. Evitez toute expositiondirecte au rayon laser. Evitez
de regarder fixement le faisceau ou del'observer à l'aide d'instruments optiques.
Chapter 1.Important safety information 15
≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb)
ATTENTION:
Soulevez la machine avec précaution.
ATTENTION:
L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent
pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs
cordonsd'alimentation. Pour mettre l'unité hors tension, vous devez déconnectertous les cordons de
la source d'alimentation.
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VORSICHT
An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen.
Aus Sicherheitsgründen:
• Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen. Ferner keine Installations-,
Wartungs- oder Rekonfigurationsarbeiten durchführen.
• Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt
anschließen.
• Alle angeschlossenen Geräte ebenfalls an Schutzkontaktsteckdosen mit ordnungsgemäß
geerdetem Schutzkontakt anschließen.
• Die Signalkabel nach Möglichkeit einhändig anschließen oder lösen, um einen Stromschlag durch
Berühren von Oberflächen mit unterschiedlichem elektrischem Potenzial zu vermeiden.
• Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen.
16 M70a and M90a Hardware Maintenance Manual
• Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken
und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und
Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind.
• Zum Installieren, Transportieren und Öffnen der Abdeckungen des Computers oder der
angeschlossenen Einheiten die Kabel gemäß der folgenden Tabelle anschließen und abziehen.
Zum Anschließen der Kabel gehen Sie wie folgt vor Zum Abziehen der Kabel gehen Sie wie folgt vor
1. Schalten Sie alle Einheiten AUS.
2. Schließen Sie erst alle Kabel an die Einheiten an.
3. Schließen Sie die Signalkabel an die Buchsen an.
4. Schließen Sie die Netzkabel an die Steckdose an.
5. Schalten Sie die Einheit EIN.
1. Schalten Sie alle Einheiten AUS.
2. Ziehen Sie zuerst alle Netzkabel aus den
Netzsteckdosen.
3. Ziehen Sie die Signalkabel aus den Buchsen.
4. Ziehen Sie alle Kabel von den Einheiten ab.
CAUTION:
Eine verbrauchte Lithiumbatterie nur durch eine Batterie mit der Teilenummer 45C1566 oder eine
gleichwertige, vom Hersteller empfohlene Batterie ersetzen. Enthält das System ein Modul mit einer
Lithiumbatterie, dieses nur durch ein Modul desselben Typs und von demselben Hersteller ersetzen. Die
Batterie enthält Lithium und kann bei unsachgemäßer Verwendung, Handhabung oder Entsorgung
explodieren.
Die Batterie nicht:
• mit Wasser in Berührung bringen.
• über 100 C erhitzen.
• reparieren oder zerlegen.
Die örtlichen Bestimmungen für die Entsorgung von Sondermüll beachten.
ACHTUNG:
Bei der Installation von Lasergeräten (wie CD-ROM-Laufwerken, DVD- aufwerken, Einheiten mit
Lichtwellenleitertechnik oder Sendern) Folgendes beachten:
• Die Abdeckungen nicht entfernen. Durch Entfernen der Abdeckungen des Lasergeräts können
gefährliche Laserstrahlungen freigesetzt werden. Das Gerät enthält keine zu wartenden Teile.
• Werden Steuerelemente, Einstellungen oder Durchführungen von Prozeduren anders als hier
angegeben verwendet, kann gefährliche Laserstrahlung auftreten.
VORSICHT
Einige Lasergeräte enthalten eine Laserdiode der Klasse 3A oder 3B. Beachten Sie Folgendes:
Chapter 1.Important safety information 17
Laserstrahlung bei geöffneter Verkleidung. Nicht in den Strahl blicken. Keine Lupen oder Spiegel
verwenden. Strahlungsbereich meiden.
≥18 kg ≥32 kg ≥55 kg
ACHTUNG:
Arbeitsschutzrichtlinien beim Anheben der Maschine beachten.
ACHTUNG:
Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht
unterbrochen. Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein. Um die
Stromversorgung für die Einheit vollständig zu unterbrechen, müssen alle zum Gerät führenden
Netzkabel vom Netz getrennt werden.
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18 M70a and M90a Hardware Maintenance Manual
1
2
PERICOLO
La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere
pericolosa.
Per evitare il rischio di scosse elettriche:
20 M70a and M90a Hardware Maintenance Manual
• Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la
riconfigurazione del prodotto durante un temporale.
• Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a
terra.
• Collegare alle prese elettriche appropriate tutte le apparecchiature che verranno utilizzate per
questo prodotto.
• Se possibile, utilizzare solo una mano per collegare o scollegare i cavi di segnale.
• Non accendere assolutamente apparecchiature in presenza di incendi, perdite d'acqua o danno
strutturale.
• Scollegare i cavi di alimentazione, i sistemi di telecomunicazione, le reti e il modem prima di aprire i
coperchi del dispositivo, salvo istruzioni contrarie relative alle procedure di installazione e
configurazione.
• Collegare e scollegare i cavi come descritto nella seguente tabella quando vengono effettuate
operazioni di installazione, spostamento o apertura dei coperchi di questo prodotto o delle unità
collegate.
Per collegarsi Per scollegarsi
1. SPEGNERE le apparecchiature.
2. Innanzitutto, collegare tutti i cavi alle unità.
3. Collegare i cavi di segnale ai connettori.
4. Collegare i cavi di alimentazione alla presa.
5. Accendere l'unità.
1. SPEGNERE le apparecchiature.
2. Innanzitutto, rimuovere i cavi di alimentazione dalla
presa.
3. Rimuovere i cavi di segnale dai connettori.
4. Rimuovere tutti i cavi dalle unità.
ATTENZIONE:
Quando si sostituisce la batteria al litio, utilizzare solo il Numero parte 45C1566 o un tipo di batteria
equivalente consigliato dal produttore. Se sul sistema è presente un modulo che contiene una batteria
al litio, sostituirlo solo con un tipo di modulo dello stesso tipo della stessa casa di produzione. La
batteria contiene litio e può esplodere se usata, maneggiata o smaltita in modo non corretto.
Non:
• Gettare o immergere la batteria nell'acqua
• Riscaldarla ad una temperatura superiore ai 100 gradi C (212 gradi F)
• Smontarla, ricaricarla o tentare di ripararla
Le batterie usate vanno smaltite in accordo alla normativa in vigore (DPR 915/82 e successive
disposizioni e disposizioni locali).
ATTENZIONE:
Quando vengono installati prodotti laser (quali CD-ROM, unità DVD-ROM, unità a fibre ottiche o
trasmittenti), tener presente quanto segue:
Chapter 1.Important safety information 21
• Non rimuovere gli sportelli. L'apertura di un'unità laser può determinare l'esposizione a radiazioni
laser pericolose. All'interno dell'unità non vi sono parti su cui effettuare l'assistenza tecnica.
• L'utilizzo di controlli, regolazioni o l'esecuzione di procedure non descritti nel presente manuale
possono provocare l'esposizione a radiazioni pericolose.
PERICOLO
Alcune unità laser contengono un diodo laser di Classe 3A o Classe 3B. Tener presente quanto segue:
Aprendo l'unità vengono emesse radiazioni laser. Non fissare il fascio, non guardarlo direttamente
con strumenti ottici ed evitare l'esposizione al fascio.
≥18 kg ≥32 kg ≥55 kg
ATTENZIONE:
Prestare attenzione nel sollevare l'apparecchiatura.
ATTENZIONE:
Il pulsante di controllo dell'alimentazione presente sull'unità e l'interruttore dell'alimentatore non
disattivano l'alimentazione corrente fornita all'unità. E' possibile che l'unità disponga di più cavi di
alimentazione. Per disattivare l'alimentazione dall'unità, accertarsi che tutti i cavi di alimentazione
siano scollegati dalla fonte di alimentazione.
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22 M70a and M90a Hardware Maintenance Manual
1
2
PELIGRO
La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede ser
peligrosa.
Para evitar el riesgo de descarga eléctrica:
• No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o
reconfiguración de este producto durante una tormenta eléctrica.
• Conecte todos los cables de alimentación a tomas de corriente debidamente cableadas y
conectadas a tierra.
• Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente
debidamente cableadas.
• Siempre que sea posible, utilice una sola mano para conectar o desconectar los cables de señal.
24 M70a and M90a Hardware Maintenance Manual
• No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales.
• Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los
módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo
contrario en los procedimientos de instalación y configuración.
• Conecte y desconecte los cables, como se describe en la tabla siguiente, cuando instale, mueva o
abra las cubiertas de este producto o de los dispositivos conectados.
Para conectar Para desconectar
1. APÁGUELO todo.
2. En primer lugar, conecte todos los cables a los
dispositivos.
3. Conecte los cables de señal a los conectores.
4. Enchufe los cables de alimentación a las tomas de
corriente.
5. Encienda el dispositivo.
1. APÁGUELO todo.
2. En primer lugar, desenchufe los cables de
alimentación de las tomas de corriente.
3. Desconecte los cables de señal de los conectores.
4. Desconecte todos los cables de los dispositivos.
PRECAUCIÓN:
Cuando sustituya una batería de litio, utilice solamente una batería número de pieza 45C1566 u otra
de tipo equivalente recomendada por el fabricante. Si su sistema dispone de un módulo que contiene
una batería de litio, reemplácelo sólo con el mismo tipo de módulo, del mismo fabricante. La batería
contiene litio y puede explotar si no se utiliza, manipula o desecha correctamente.
No debe:
• Arrojarla al agua o sumergirla en ella
• Exponerla a temperaturas superiores a 100°C (212°F)
• Repararla o desmontarla
Deshágase de la batería según especifiquen las leyes o normas locales.
PRECAUCIÓN:
Cuando haya productos láser (como unidades de CD-ROM, unidades de DVD, dispositivos de fibra
óptica o transmisores) instalados, tenga en cuenta lo siguiente:
• No quite las cubiertas. Si quita las cubiertas del producto láser, podría quedar expuesto a radiación
láser peligrosa. Dentro del dispositivo no existe ninguna pieza que requiera servicio técnico.
• Si usa controles o ajustes o realiza procedimientos que no sean los especificados aquí, podría
exponerse a radiaciones peligrosas.
PELIGRO
Chapter 1.Important safety information 25
Algunos productos láser tienen incorporado un diodo láser de clase 3A o clase 3B. Tenga en cuenta lo
siguiente:
Cuando se abre, queda expuesto a radiación láser. No mire directamente al rayo láser, ni siquiera con
instrumentos ópticos, y evite exponerse directamente al rayo láser.
≥18 kg ≥32 kg ≥55 kg
PRECAUCIÓN:
Adopte procedimientos seguros al levantar el equipo.
PRECAUCIÓN:
El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de
alimentación no desconectan la corriente eléctrica suministrada al dispositivo. Además, el dispositivo
podría tener más de un cable de alimentación. Para suprimir toda la corriente eléctrica del dispositivo,
asegúrese de que todos los cables de alimentación estén desconectados de la toma de corriente.
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26 M70a and M90a Hardware Maintenance Manual
Chapter 2. Important service information
Strategy for replacing FRUs
Before replacing parts:
Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before you replace any FRUs
listed in this manual.
After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before you
complete the service action.
To download and install software fixes, drivers, and UEFI BIOS, go to https://pcsupport.lenovo.com and follow
the instructions on the screen.
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:
• If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the
original FRU before you continue.
• Some computers have both a processor board and a system board. If you are instructed to replace either
the processor board or the system board, and replacing one of them does not correct the problem,
reinstall that board, and then replace the other one.
• If an adapter or a device consists of more than one FRU, any of the FRUs might be the cause of the error.
Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
Strategy for replacing a hard disk drive or a solid-state drive
Always try to run a low-level format operation before replacing a hard disk drive or a solid-state drive. This
will cause all customer data on the drive to be lost. Ensure that the customer has a current backup of the
data before you perform this task.
Attention: The drive startup sequence in the computer you are servicing might have been changed. Be
extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect
drive, data or programs can be overwritten.
Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper handling of a system board can
cause damage to those components, and may cause a system malfunction.
After replacing the system board, use the Golden Key U1 tool to bind the model type, serial number, and
Brand ID of the computer with the new system board. Refer to https://support.lenovo.com/us/en/solutions/
ht507251 for instructions.
Attention: When handling a system board:
• Do not drop a system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending a system board and hard pushing to prevent cracking at each Ball Grid Array (BGA)
chipset.
© Copyright Lenovo 2021 27
How to use error codes
Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed,
begin the diagnosis with the first error code. Whatever causes the first error code might also cause false error
codes. If no error code is displayed, see whether the error symptom is listed in the “Symptom-to-FRU Index”
section.
Strategy for replacing FRUs for CTO, special-bid, and standard models
This topic provides information about the model types and FRU identification.
Product definition
This topic introduces different model types and how to identify each type.
Dynamic Configure To Order (CTO) model
This model provides the ability for a customer to configure a Lenovo solution from a Web site, and have this
configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and
eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.
The model is “CTO1” and the default country code is “WW” (example: 20AACTO1WW).
Special-bid model
This model is a unique configuration that has been negotiated between Lenovo and the customer. A unique
MTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided
to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not
designate a specific country or region. The custom model factsheet for the MTM indicates which country the
special-bid MTM is set up for. Special-bid offering is not generally announced.
Standard model
Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the
machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country
code. The country code assigned is alphabetic and represents a designated country or region (example:
20AA0009UK).
FRU identification
To identify FRUs for a product, do the following:
1. Go to: https://support.lenovo.com/partslookup
2. Type the Machine Type in the corresponding field to get a general FRU list, or type the Serial Number for
more detailed FRU information.
28 M70a and M90a Hardware Maintenance Manual
Chapter 3. Product overview
Front
1. Integrated camera activity
indicator* This indicator is on when the camera is in use.
2. Microphones* Capture or record sound and voice.
3. Integrated camera or IR
camera shield* Slide to cover the camera lens whenever you need.
4. Integrated camera or IR
camera*
• Take pictures or record videos by clicking Camera from the Start menu.
• Log in to your computer with face authentication.
If you use other apps that support photographing, video chatting, and video
conference, the camera starts automatically when you enable the camera-
required feature from the app.
5. Multi-touch screen* Enable you to use your computer with simple touch gestures.
6. System status indicator
The indicator shows the system status of your computer.
• Blinking for three times: The computer is initially connected to power.
• On: The computer is on.
• Off: The computer is off or in hibernation mode.
• Blinking rapidly: The computer is entering hibernation mode.
• Breathing (blinking slowly): The computer is in sleep or modern standby
mode.
7. Storage drive activity indicator This indicator is on when the storage drive is in use.
8. Microphone mute/unmute
indicator* This indicator is on when the microphones are muted.
© Copyright Lenovo 2021 29
9. E-Privacy button*
Press the button to enable the E-Privacy mode. In this mode, your screen
prevents visual hackers from stealing sideways glances at your screen, while
providing a crisp, clear view for intended users. To exit from the mode, press the
button again.
10. Microphone mute/unmute
control* Mute or unmute the integrated microphones in the computer mode.
11. USB-C™ connector (USB 3.2
Gen 1)
• Charge USB-C compatible devices with the output voltage and current of 5 V
and 3 A.
• Transfer data at USB 3.2 speed, up to 5 Gbps.
• Connect to USB-C accessories to help expand your computer functionality. To
purchase USB-C accessories, go to https://www.lenovo.com/accessories.
12. USB 3.2 connector Gen 2 Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB
storage device, or USB printer.
13. USB 3.2 connectors Gen 2
(M90a) or USB 3.2 connector
Gen 1 (M70a)
Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB
storage device, or USB printer.
14. Headset connector Connect a headset or headphones to your computer.
15. Optical drive eject/close
button* Eject or close the optical drive tray.
16. Optical drive activity
indicator* This indicator is on when the optical drive is in use.
17. SD-card slot*
Supported cards:
• Secure Digital (SD) card
• Secure Digital eXtended-Capacity (SDXC) UHS-1 card
• Secure Digital High-Capacity (SDHC) UHS-1 card
Note: Your computer does not support the content protection for recordable
media (CPRM) feature for the SD card.
18. Power button
Press to turn on the computer.
To turn off the computer, open the Start menu, click Power, and then select
Shut down.
* for selected models
30 M70a and M90a Hardware Maintenance Manual
Rear
1. Security-lock slot Lock your computer to a desk, table, or other fixtures through a Kensington-style
cable lock.
2. Cable cover eject button Press the button to access the covered connectors and cables.
Note: For easy access, do not cover the button with any external parts.
3. Cable clip Press the clip to route the cables connected to the computer.
4. USB 3.2 connector Gen 1 (with
keyboard smart power on
feature)
Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB
storage device, or USB printer.
Note: When a USB keyboard is connected, you can turn on the computer by
pressing Alt+P on the keyboard.
5. USB 3.2 connectors Gen 1 (3) Connect USB-compatible devices, such as a USB keyboard, USB mouse, USB
storage device, or USB printer.
6. Ethernet connector
Connect to a local area network (LAN). When the green indicator is on, the
computer is connected to a LAN. When the yellow indicator blinks, data is being
transmitted.
7. Serial connector* Connect an external modem, a serial printer, or other devices that use a serial
connector.
8. Power cord connector Connect the power cord to your computer for power supply.
9. DisplayPort® 1.2 out connector
Send audio and video signals from the computer to another audio or video device,
such as a high-performance monitor. For more information, see https://
www.vesa.org/wp-content/uploads/2010/12/DisplayPort-DevCon-Presentation-DP-
1.2-Dec-2010-rev-2b.pdf.
10. VESA® threaded holes Use the matched screws (M4 x 8 mm, 4 pcs) when you install the computer on a
wall with the VESA mount.
Chapter 3.Product overview 31
* for selected models
32 M70a and M90a Hardware Maintenance Manual
Chapter 4. Service checkout and symptom-to-FRU index
This chapter provides information about general service checkout and symptom-to-FRU index.
Service checkout
Attention: The drives in the computer you are servicing might have been rearranged or the drive startup
sequence changed. Be extremely careful during write operations such as copying, saving, or formatting.
Data or programs can be overwritten if you select an incorrect drive.
General error messages appear if a problem or conflict is found by a program, the operating system, or both.
For an explanation of these messages, refer to the information supplied with that software package.
Use the following procedure to help determine the cause of the problem:
1. Turn off the computer and all external devices.
2. Check all cables and power cords.
3. Set all display controls to the middle position.
4. Turn on all external devices.
5. Turn on the computer.
• Look for displayed error codes.
• Listen for beep codes.
• Look for readable instructions or a main menu on the display.
If you did not receive the correct response, proceed to step 6 on page 33.
If you do receive the correct response, proceed to step 7 on page 33.
6. Look at the following conditions and follow the instructions:
• If you hear beep codes during POST, go to “Beep symptoms” on page 35.
• If the computer displays a POST error, go to “POST error codes” on page 35.
• If the computer hangs and no error is displayed, continue at step 7 on page 33.
7. Run the Diagnostic programs. See “Diagnostics” on page 50.
• If you receive an error, replace the part that the diagnostic program calls out.
• If the test stops and you cannot continue, replace the last device tested.
Problem determination tips
Due to the variety of hardware and software combinations that can be encountered, use the following
information to assist you in problem determination. If possible, have this information available when
requesting assistance from Service Support and Engineering functions.
• Machine type and model
• Processor or hard disk drive upgrades
• Failure symptom
– Do diagnostics indicate a failure?
– What, when, where, single, or multiple systems?
– Is the failure repeatable?
– Has this configuration ever worked?
© Copyright Lenovo 2021 33
– If it has been working, what changes were made prior to its failing?
– Is this the original reported failure?
• Diagnostics version
– Type and version level
• Hardware configuration
– Print (print screen) configuration currently in use
– BIOS level
• Operating system software
– Type and version level
Notes: To eliminate confusion, identical systems are considered identical only if they:
1. Are the exact machine type and models
2. Have the same BIOS level
3. Have the same adapters/attachments in the same locations
4. Have the same address jumpers/terminators/cabling
5. Have the same software versions and levels
6. Have the same Diagnostic Diskettes (version)
7. Have the same configuration options set in the system
8. Have the same setup for the operating system control files
Comparing the configuration and software set-up between “working and non-working” systems will often
lead to problem resolution.
Symptom-to-FRU index
The Symptom-to-FRU index lists error symptoms and possible causes. The most likely cause is listed first.
Always begin with “Service checkout” on page 33. This index can also be used to help you decide which
FRUs to have available when servicing a computer. If you are unable to correct the problem using this index,
go to “Undetermined problems” on page 38.
Notes:
• The Symptom-to-FRU index is not specific to any machine type and are applicable to all ThinkCentre computers.
• If you have both an error message and an incorrect audio response, diagnose the error message first.
• If you cannot run the diagnostic tests or you get a diagnostic error code when running a test, but did receive a
POST error message, diagnose the POST error message first.
• If you did not receive any error message, look for a description of your error symptoms in the first part of this index.
Hard disk drive boot error
A hard disk drive boot error can have the following causes.
Error FRU/Action
The start-up drive is not in the boot sequence in
configuration.
Check the configuration and ensure that the start-up drive
is in the boot sequence.
No operating system installed on the boot drive. Install an operating system on the boot drive.
34 M70a and M90a Hardware Maintenance Manual
Error FRU/Action
The boot sector on the startup drive is corrupted. The drive must be formatted. Do the following:
1. Attempt to back up the data on the failing hard disk
drive.
2. Using the operating system programs, format the
hard disk drive.
The drive is defective. Replace the hard disk drive.
Power supply problems
If you suspect a power problem, use the following procedures.
Check/Verify FRU/Action
Check the following for proper installation.
• Power cord
• On/Off switch connector
• On/Off switch power supply connector
• System board power supply connectors
• Microprocessor connection
Reseat connectors
Check the power cord for continuity. Power cord
Check the power-on switch for continuity. Power-on switch
Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST.
The following table describes the beep symptoms.
Beep symptom FRU/Action
2 short beeps: common POST error Common POST error code. See the detailed failure
information in “POST error codes” on page 35.
3 short and 1 long beeps: DRAM memory error Perform the following actions in order:
1. Make sure that the memory modules are properly
seated in the memory slots.
2. Replace the memory modules.
3. Replace the system board (for trained service
personnel only).
POST error codes
Each time you turn on the system, it performs a series of tests that check the operation of the system and
some options. This series of tests are called the Power-On Self-Test, or POST. POST checks the following
operations:
• Some basic system-board operations
• Memory operation
• Video operation
Chapter 4.Service checkout and symptom-to-FRU index 35
• Whether the boot drive is working
If the POST detects a problem, an error message appears on the screen. A single problem might cause
several error messages to appear. When you correct the cause of the first error message, the other error
messages probably will not appear on the screen the next time.
Error code POST error message Description/Action
0135 CPU fan failure
System fan failure
This error message is displayed when
a fan fails and the system might be
overheating.
Press F1 to enter the BIOS setup and
then press F10 to exit and restart the
computer.
0211 Keyboard not found This error message is displayed when
no keyboard is detected.
0164 Memory configuration change has
occurred
This error message is displayed when
a memory module has been installed,
removed, or replaced.
Press F1 to enter the BIOS setup and
then press F10 to exit and restart the
computer.
1762 Storage SATA device configuration
change has occurred
Device configuration change includes
SATA device change and M.2 storage
drive change.
Press F1 to enter the BIOS setup and
then press F10 to exit and restart the
computer.
Miscellaneous error conditions
Message/Symptom FRU/Action
Changing display colors Display/Monitor
Computer will not power-off. 1. Power Switch
2. System Board
3. Riser card, if installed.
Computer will not RPL from server 1. Ensure that the network is in startup sequence as the
first device or the first device after diskette.
2. Ensure that the network adapter is enabled for RPL.
3. Network adapter (Advise network administrator of
new MAC address)
36 M70a and M90a Hardware Maintenance Manual
Message/Symptom FRU/Action
Computer will not perform a Wake On LAN® (if applicable) 1. Check the power supply and signal cable
connections to the network adapter.
2. Ensure that the operating system settings are set to
enable Wake on LAN.
3. Ensure that the Wake On LAN feature is enabled in
Setup/Power.
4. Ensure that the network administrator is using the
correct MAC address.
5. Ensure no interrupt or I/O address conflicts.
6. Network adapter (advise network administrator of
new MAC address)
Dead computer. 1. Power Supply
2. System Board
Diskette drive in-use light remains on or does not light
when drive is active. 1. Diskette Drive
2. System Board
3. Diskette Drive Cable
Blank screen except for flashing cursor. 1. System Board
2. Primary Hard Disk Drive
3. Hard Disk Drive Cable
Incorrect memory size during POST 1. Run the Memory tests.
2. Memory Module
3. System Board
"Insert a Diskette" icon appears with a known-good
diagnostics diskette in the first 3.5-inch diskette drive. 1. System Board
2. Diskette Drive Cable
3. Network Adapter
Intensity or color varies from left to right of characters and
color bars 1. Display
2. Video adapter (if present)
3. System Board
No power or fan not running See “Power supply problems” on page 35.
Non-system disk or disk error-type message with a
known-good diagnostic diskette. 1. Diskette Drive
2. System Board
3. Diskette Drive Cable
Other display symptoms not listed above (including blank
or illegible display) 1. Display
2. System Board
Power-on indicator or hard disk drive in-use light not on,
but computer works correctly 1. Power switch/LED assembly
2. System Board
Printer problems 1. Printer
2. System Board
Chapter 4.Service checkout and symptom-to-FRU index 37
Message/Symptom FRU/Action
Program loads from the hard disk with a known-good
diagnostics diskette in the first 3.5-inch diskette drive 1. Run the Setup Utility program and check the Startup
sequence.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
RPL computer cannot access programs from its own hard
disk. 1. If the network administrator is using LCCM Hybrid
RPL, check the startup sequence:
a. First device - network
b. Second device - hard disk
2. Hard disk drive
RPL computer does not RPL from server 1. Check the startup sequence.
2. Check the network adapter LED status.
Serial or parallel connector device failure (system board
connector) 1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
Serial or parallel connector device failure (adapter
connector) 1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
Some or all keys on the keyboard do not work 1. Keyboard
2. Keyboard Cable
3. System Board
Undetermined problems
This section provides instructions on how to find out the failing devices or adapters.
1. Turn off the computer.
2. Remove or disconnect the following components (if installed) one at a time.
a. External devices (modem, printer, or mouse)
b. Any adapters
c. Memory modules
d. Extended video memory
e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Turn on the computer to retest the system.
38 M70a and M90a Hardware Maintenance Manual
40 M70a and M90a Hardware Maintenance Manual
Chapter 5. Troubleshooting, diagnostics, and recovery
This chapter provides solutions to resolve computer problems. Use the basic procedure as a starting point
for resolving computer problems.
Basic procedure for resolving computer problems
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
1. Check that:
a. The cables for all connected devices are connected correctly and securely.
b. All components have been reassembled correctly.
c. All connected devices that require ac power are connected to properly grounded and working
electrical outlets.
d. All connected devices are enabled in UEFI BIOS.
2. Use an antivirus program (if any) to see if the computer has been infected by a virus. If the program
detects a virus, remove the virus.
3. See Chapter 5 “Troubleshooting, diagnostics, and recovery” on page 41 to resolve the problem you are
experiencing, run the diagnostic program, and recover your operating system.
4. If the problem persists, contact Lenovo.
Troubleshooting
Use the troubleshooting information to find solutions to problems that have definite symptoms.
© Copyright Lenovo 2021 41
Startup problems
Problem Solution
The computer does not start up when you
press the power button.
• Ensure that the power cord is correctly connected to the rear of the
computer and to a working electrical outlet.
• If the computer has a secondary power switch on the rear of the
computer, ensure that it is switched on.
• The power indicator on the front of the computer is on.
• The computer voltage matches the voltage available at the
electrical outlet for your country or region.
The operating system does not start up from
the correct storage drive or fails to start up
• Ensure that all storage drive signal cables and power cables are
connected correctly.
• Ensure that the storage drive the computer starts up from is listed
as the first startup device in UEFI BIOS.
• In rare cases, the storage drive with the operating system might get
corrupted or damaged. In such cases, you might need to replace
the storage drive.
• If the computer is installed with an Optane memory:
– Ensure that the Optane memory is not removed.
– Ensure that the Optane memory is not damaged. Check the
Optane memory using diagnostic tools.
The computer beeps multiple times before
the operating system starts up. Ensure that no keys are stuck.
42 M70a and M90a Hardware Maintenance Manual
Screen problems
Problem Solution
The screen goes blank while the computer is
on.
• The computer voltage matches the voltage available at the
electrical outlet for your country or region.
• Press a key to exit the screen saver.
• Press the power button to wake the computer from sleep or
hibernation mode.
• The brightness and contrast is set correctly.
• If the screen goes blank when some programs start, install the
device drivers for the programs. Refer to the documentation for the
affected program to check whether any device drivers are required.
The image appears to be flickering.
• The screen might be affected by interference from nearby
equipment. Magnetic fields around other devices, such as
transformers, appliances, fluorescent lights, and other monitors,
might be causing the problem. Move fluorescent desk lighting or
any equipment that produces magnetic fields farther away from the
screen. If the problem persists, turn off the computer. Then, adjust
the placement of the computer and other devices so that they are
at least 305 mm (12 inches) apart. Turn on the computer.
• Reset the refresh rate.
1. Right-click a blank area on the desktop.
2. Click Display settings. On the Display tab, click Advanced
display settings ➙ Display adapter properties for Display 1.
3. Click the Monitor tab, and then reset the refresh rate to be the
highest and noninterlaced.
The image is discolored.
• The screen might be affected by interference from nearby
equipment. Move fluorescent desk lighting or any equipment that
produces magnetic fields farther away from the screen.
• Turn off the computer. Then, adjust the placement of the computer
and other devices so that they are at least 305 mm (12 inches)
apart. Turn on the computer.
Chapter 5.Troubleshooting, diagnostics, and recovery 43
Audio problems
Problem Solution
The audio cannot be heard on the Windows®
operating system.
• If you are using powered external speakers that have an On/Off
control, ensure that:
– The On/Off control is set to the On position.
– The speaker power cable is connected to a properly grounded,
functional ac electrical outlet.
• If your external speakers have a volume control, ensure that the
volume is not set too low.
• Click the volume icon in the Windows notification area on the
taskbar. Check the speaker and volume settings. Do not mute the
speaker or set the volume at a very low level.
• If your computer has a front audio panel, ensure that the volume is
not set too low.
• Ensure that your external speakers (and headphones, if used) are
connected to the correct audio connector on the computer. Most
speaker cables are color-coded to match the audio connector.
Note: When external-speaker or headphone cables are connected
to the audio connector, the internal speaker, if present, is disabled.
In most cases, if an audio adapter is installed in one of the
expansion slots, the audio function built into the system board is
disabled. Therefore, you must use the audio connectors on the
audio adapter.
• Ensure that the program you are running is designed for use in the
Microsoft Windows operating system. If the program is designed to
run in DOS, the program does not use the Windows sound feature.
The program must be configured to use SoundBlaster Pro or
SoundBlaster emulation.
• Ensure that the audio device drivers are correctly installed.
The sound does not come from the headset
or headphones.
Select the headset or headphones as the default audio output device
in advanced sound settings.
The sound comes from one of the external
speakers.
• Ensure that the speaker cable is inserted completely into the
connector on the computer.
• Ensure that the cable that connects the left speaker to the right
speaker is securely connected.
• Ensure that the balance settings are set correctly.
1. Right-click the volume icon in the Windows notification area
on the taskbar. Then, click Open Volume Mixer and select the
desired speaker.
2. Click the speaker icon on top of the volume control, and then
click the Levels tab.
Network problems
Note: The Wi-Fi® and Bluetooth features are optional.
44 M70a and M90a Hardware Maintenance Manual
Problem Solution
The computer cannot connect to an Ethernet
LAN.
• Connect the cable from the Ethernet connector to the RJ45
connector of the hub.
• Enable the Ethernet LAN feature in UEFI BIOS.
• Enable the Ethernet LAN adapter.
1. Go to Control Panel and view by large icons or small icons.
2. Click Network and Sharing Center ➙ Change adapter
settings.
3. Right-click the Ethernet LAN adapter icon and click Enable.
• Update or reinstall the Ethernet LAN driver.
• Install all networking software that is necessary for your network
environment. Check with your LAN administrator for the necessary
networking software.
• Set the same duplex for the switch port and the adapter. If you
configured the adapter for full duplex, ensure that the switch port is
also configured for full duplex. Setting a wrong duplex mode might
degrade performance, cause data loss, or result in lost
connections.
When a Gigabit Ethernet model computer is
used at a speed of 1000 Mbps, the Ethernet
LAN connection fails or errors occur.
Connect the network cable to the Ethernet connector using Category
5 wiring and a 100 BASE-T hub/switch (not 100 BASE-X).
The Wake On LAN (WOL) feature does not
work. Enable the Wake On LAN feature in UEFI BIOS.
The Wi-Fi feature does not work.
• Enable the Wi-Fi feature in UEFI BIOS.
• Enable all Wi-Fi devices.
1. Right-click the Start button to open the Start context menu.
2. Click Device Manager. Type the administrator password or
provide confirmation, if prompted.
3. Expand Network adapters to display all network devices.
4. Right-click each Wi-Fi device, and then click Enable device.
• Enable the Wi-Fi feature in Windows Settings.
1. Open the Start menu.
2. Click Settings ➙ Network & Internet ➙ Wi-Fi.
3. Enable the Wi-Fi feature.
• Update or reinstall the Wi-Fi driver.
Chapter 5.Troubleshooting, diagnostics, and recovery 45
Problem Solution
The Bluetooth feature does not work.
• Enable the Bluetooth feature in UEFI BIOS.
• Enable all Bluetooth devices.
1. Right-click the Start button to open the Start context menu.
2. Click Device Manager. Type the administrator password or
provide confirmation if prompted.
3. Expand Bluetooth to display all Bluetooth devices. Right-click
each Bluetooth device, and then click Enable device.
4. Expand Network adapters to display all network devices.
Right-click each Bluetooth device, and then click Enable
device.
• Turn on the Bluetooth radio.
1. Open the Start menu.
2. Click Settings ➙ Devices ➙ Bluetooth & other devices.
3. Turn on the Bluetooth switch to enable the Bluetooth feature.
• Update or reinstall the Bluetooth driver.
Sound does not come from the Bluetooth
headset or headphones.
Select the Bluetooth headset or headphones as the default audio
output device in advanced sound settings.
46 M70a and M90a Hardware Maintenance Manual
Performance problems
Problem Solution
Excessive fragmented files exist on the
storage drives.
Note: Depending on the volume of the storage drives and amount of
data stored on the storage drives, the disk-defragmentation process
might take up to several hours.
1. Close any open programs and windows.
2. Open the Start menu.
3. Click Windows System ➙ File Explorer ➙ This PC.
4. Right-click your C drive and then click Properties.
5. Click the Tools tab.
6. Click Optimize. Select the drive as desired, and then click
Optimize.
7. Follow the on-screen instructions.
The free storage drive space is insufficient.
• Clean out your Inbox, Sent Items, and Deleted Items folders from
your e-mail application.
• Clean up your C drive.
1. Open the Start menu.
2. Click Windows System ➙ File Explorer ➙ This PC.
3. Right-click your C drive and then click Properties.
4. Check the amount of free space, and then click Disk Cleanup.
5. A list of unnecessary file categories is displayed. Select the
category you want to delete, and then click OK.
• Disable some Windows features or remove some unnecessary
programs.
1. Go to Control Panel and view by large icons or small icons.
2. Click Programs and Features.
3. Do one of the following:
– To disable some Windows features, click Turn Windows
features on or off. Follow the on-screen instructions.
– To remove some unnecessary programs, select the
program you want to remove, and then click Uninstall/
Change or Uninstall.
The free memory space is insufficient.
• Right-click a blank area on the taskbar and open Task Manager.
Then, end some tasks you are not performing.
• Install additional memory modules.
Chapter 5.Troubleshooting, diagnostics, and recovery 47
Storage drive problems
Problem Solution
Some or all storage drives are missing from
the BIOS menu.
• Ensure that the signal cables and power cables for all the storage
drives are connected correctly.
• Ensure that the computer is configured correctly to support the
storage drives.
– If the computer is installed with SATA storage drives, ensure
that the SATA storage drive enablement module (one to five
storage drives) is installed.
– If the computer is installed with SAS storage drives, ensure that
the SAS storage drive enablement module (one to five storage
drives) or the LSI MegaRAID SAS adapter is installed.
CD or DVD problems
Problem Solution
A CD or DVD does not work.
• Ensure that the optical drive supports the CD or DVD.
• Ensure that the disc is inserted correctly, with its label up.
• Ensure that the disc you are using is clean. To remove dust or
fingerprints, wipe the disc clean with a soft cloth from the center to
the outside. Wiping a disc in a circular motion might cause loss of
data.
• Ensure that the power cable and signal cable are securely
connected to the drive.
• Ensure that the disc you are using is not scratched or damaged.
Try inserting another disc that you know works.
• If you have multiple CD or DVD drives installed (or a combination of
CD and DVD drives), try inserting the disc into the other drive. In
some cases, only one of the drives is connected to the audio
subsystem.
A bootable recovery medium, such as the
Product Recovery CD, cannot be used to
start your computer.
Ensure that the CD or DVD drive is set as the top priority of the boot
priority order in UEFI BIOS.
Note: On some computer models, the startup sequence is
permanently set and cannot be changed.
A black screen is displayed instead of the
DVD video.
• Restart the DVD player program.
• Try a lower screen resolution or color depth.
• Close any open files, and then restart the computer.
A DVD movie does not play.
• Ensure that the disc surface is clean and not scratched.
• Check the disc or packaging for regional coding. You might need
to purchase a disc with coding for the region where you are using
the computer.
No audio or only an intermittent audio comes
out while a DVD movie is playing.
• Check the volume control settings on the computer and on your
speakers.
• Ensure that the disc surface is clean and not scratched.
• Check all cable connections to and from the speakers.
• Use the DVD menu for the video to select a different audio track.
48 M70a and M90a Hardware Maintenance Manual
Problem Solution
The playback is slow or choppy. • Disable any background programs, such as AntiVirus or Desktop
Themes.
• Ensure that video resolution is less than 1152 x 864 pixels.
A message indicating invalid disc or no disc
found is displayed.
• Ensure that the disc is in the drive with the shiny side of the disc
facing down.
• Ensure that video resolution is less than 1152 x 864 pixels.
• Ensure that the DVD or CD is inserted into an appropriate optical
drive. For example, do not insert a DVD into a CD-only drive.
Serial connector problems
Problem Solution
The serial connector cannot be accessed.
• Connect the serial cable from the serial connector on the computer
to the serial device. If the serial device has its own power cord,
connect the power cord to a grounded electrical outlet.
• Turn on the serial device and keep the device online.
• Install any programs supplied with the serial device. Refer to the
documentation that comes with the serial device for more
information.
• If you added one serial-connector adapter, ensure that the adapter
is installed correctly.
USB device problems
Problem Solution
A USB device cannot be accessed.
• Connect the USB cable from the USB connector to the USB
device. If the USB device has its own power cord, connect the
power cord to a grounded electrical outlet.
• Turn on the USB device and keep the device online.
• Install any device drivers or programs supplied with the USB
device. Refer to the documentation that comes with the USB
device for more information.
• Disconnect and reconnect the USB connector to reset the USB
device.
• Ensure that the Smart USB Protection function is disabled in UEFI
BIOS.
Chapter 5.Troubleshooting, diagnostics, and recovery 49
Software problems
Problem Solution
Some programs do not work as expected.
1. Check whether the problem is caused by a program.
a. Ensure that the software is compatible with the computer.
Refer to the information supplied with the software for more
information.
b. Verify that other software works correctly on the computer.
c. Verify that the software you are using works on another
computer.
2. If the problem is caused by a program:
• Refer to the printed documentation that comes with the
program or the help system of the program.
• Update the program.
• Uninstall the program and then reinstall it. To download a
program that is preinstalled on your computer, go to https://
pcsupport.lenovo.com and follow the on-screen instructions.
Diagnostics
Use diagnostic solutions to test hardware components and report operating-system-controlled settings that
interfere with the correct operation of your computer.
Lenovo diagnostic tools
For information about Lenovo diagnostic tools, go to:
https://pcsupport.lenovo.com/lenovodiagnosticsolutions
Recovery
This section introduces the recovery information of the Windows 10 operating system. Ensure that you read
and follow the on-screen recovery instructions. The data on your computer might be deleted during the
recovery process. To avoid data loss, make a backup copy of all the data that you want to keep.
Restore system files and settings to an earlier point
1. Go to Control Panel and view by large icons or small icons.
2. Click Recovery ➙ Open System Restore. Then, follow the on-screen instructions.
Restore your files from a backup
Note: If you use the File History tool to restore your files from a backup, ensure that you backed up your
data earlier with the tool.
1. Go to Control Panel and view by large icons or small icons.
2. Click File History ➙ Restore personal files. Then, follow the on-screen instructions.
Reset your computer
In the resetting process, you can choose to keep your files or remove them when you reinstall the operating
system.
Note: The items in the graphical user interface (GUI) might change without notice.
50 M70a and M90a Hardware Maintenance Manual
1. Open the Start menu, and then click Settings ➙ Update & Security ➙ Recovery.
2. In the Reset this PC section, click Get started.
3. Follow the on-screen instructions to reset your computer.
Use advanced options
1. Open the Start menu, and then click Settings ➙ Update & security ➙ Recovery.
2. In the Advanced startup section, click Restart now ➙ Troubleshoot ➙ Advanced options.
3. Select a preferred option, and then follow the on-screen instructions.
Windows automatic recovery
Note: Ensure that your computer is connected to ac power during the recovery process.
The Windows recovery environment on your computer operates independently from the Windows 10
operating system. It enables you to recover or repair the operating system even if the Windows 10 operating
system fails to start.
After two consecutive failed boot attempts, the Windows recovery environment starts automatically. Then,
you can choose repair and recovery options by following the on-screen instructions.
Create and use a recovery USB device
It is recommended that you create a recovery USB drive as early as possible as a backup for the Windows
recovery programs. With the recovery USB drive, you can troubleshoot and fix the problems even if the
preinstalled Windows recovery programs are damaged. If you did not create a recovery USB drive as a
precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo.
For a list of the Lenovo Support phone numbers for your country or region, go to:
https://pcsupport.lenovo.com/supportphonelist
Create a recovery USB drive
Attention: The creation process deletes anything stored on the USB drive. To avoid data loss, make a
backup copy of all the data that you want to keep.
1. Ensure that your computer is connected to ac power.
2. Prepare a USB drive with capacity of at least 16 GB. The actual USB capacity required depends on the
size of the recovery image.
3. Connect the prepared USB drive to the computer.
4. Type recovery in the search box. Then, click Create a recovery drive.
5. Click Yes in the User Account Control window to allow the Recovery Media Creator program to start.
6. In the Recovery Drive window, follow the on-screen instructions to create a recovery USB drive.
Use the recovery USB drive
If your computer cannot be started, go to Chapter 5 “Troubleshooting, diagnostics, and recovery” on page
41 first to try to solve the problem by yourself. If the problem persists, use the recovery USB drive to recover
your computer.
1. Ensure that your computer is connected to ac power.
2. Connect the recovery USB drive to the computer.
3. Turn on or restart the computer. When the logo screen is displayed, press F12. The Boot Menu window
opens.
Chapter 5.Troubleshooting, diagnostics, and recovery 51
4. Select the recovery USB drive as the boot device.
5. Click Troubleshoot to display optional recovery solutions.
6. Select a recovery solution as desired. Then, follow the on-screen instructions to complete the process.
Update the device driver
Attention: Reinstalling device drivers will change the current configuration of the computer.
You should download the latest driver for a component when you notice poor performance from that
component or when you added a component. This action might eliminate the driver as the potential cause of
a problem. Download and install the latest driver by one of the following methods:
• From the Vantage app:
Open the Vantage app to check the available update packages. If the latest UEFI BIOS update package is
available, follow the on-screen instructions to download and install the package.
• From the Lenovo Support Web site:
Go to https://pcsupport.lenovo.com and select the entry for your computer. Then, follow the on-screen
instructions to download and install necessary drivers and software.
• From Windows Update:
Note: The device drivers provided by Windows Update might not be tested by Lenovo. It is
recommended that you get device drivers from Lenovo.
1. Open the Start menu.
2. Click Settings ➙ Update & Security ➙ Windows Update.
3. Follow the on-screen instructions.
52 M70a and M90a Hardware Maintenance Manual
Chapter 6. Hardware removal and installation
This chapter provides instructions on how to remove and install hardware for your computer.
Handling static-sensitive devices
Do not open the static-protective package containing the new part until the defective part has been removed
and you are ready to install the new part. Static electricity, although harmless to you, can seriously damage
computer components and options.
When you handle options and other computer components, take these precautions to avoid static-electricity
damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always handle options and other computer components carefully. Handle PCI/PCIe cards, memory
modules, system boards, and microprocessors by the edges. Never touch any exposed circuitry.
• Prevent others from touching the options and other computer components.
• Touch the static-protective package containing the part to a metal expansion-slot cover or other
unpainted metal surface on the computer for at least two seconds. This reduces static electricity from the
package and your body before you install or replace a new part.
• When possible, remove the new part from the static-protective package, and install it directly in the
computer without setting the part down. When this is not possible, place the static-protective package on
a smooth, level surface and place the part on the package.
• Do not place the part on the computer cover or other metal surface.
Service tool kit
Ensure that the following common service tool kit is prepared before you service the computer.
No. Tool name Tool type
1 Phillips-head screwdriver Common tool
2 Pry tools Common tool
3Conductive tweezers Common tool
4 Isolated tweezers Common tool
5Silicone grease Consumable tool
6 Polyamide tape Consumable tool
7Mylar tape Consumable tool
8 Eraser Consumable tool
9 Electrical tape Consumable tool
10 Double-sided tape Consumable tool
11 Conductive tape Consumable tool
Note: The silicone grease can be applied to the surfaces of the microprocessor and heat sink to eliminate air
gaps.
© Copyright Lenovo 2021 53
Major FRUs and CRUs
Your computer contains the following types of CRUs and FRUs:
• Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by
trained service technicians at an additional cost.
• Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill
level. Trained service technicians can also provide service to install or replace the parts under the type of
warranty designated for the customer’s machine.
• FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers
choose to replace the FRUs by themselves, the product warranty might be affected.
Major FRUs and CRUs of M70a
54 M70a and M90a Hardware Maintenance Manual
Number Description Self-service CRU Optional-service CRU
1UltraFlex IV Stand* Yes No
2UltraFlex IV Stand base* Yes No
3Full-function monitor stand* Yes No
4Full-function monitor base* Yes No
5VESA mount bracket cover No Yes
6VESA mount bracket No Yes
7Cable cover No No
8Integrated camera and microphone module* No No
9Bump cover No No
10 Main frame No No
11 LCD bracket No No
12 LCD panel No No
13 Wi-Fi antennas No No
14 Front decorative cover No No
15 LCD backlight cable No No
16 Touch board cable No No
17 LCD LVDS cable No No
18 Speakers No No
19 Storage drive* No Yes
20 Storage drive cable* No No
21 Storage drive bracket No Yes
22 Cover presence switch (intrusion switch)* No No
23 Serial connector module* No No
24 Memory module No Yes
25 Wi-Fi card shield* No No
26 Wi-Fi card* No No
27 M.2 solid-state drive* No Yes
28 Microprocessor No No
29 System board No No
30 Card reader board* No No
31 Coin-cell battery No No
32 System fan No No
33 Heat sink No No
34 System board shield No Yes
35 Optical drive holder* No Yes
36 Optical drive bracket* No Yes
Chapter 6.Hardware removal and installation 55
Number Description Self-service CRU Optional-service CRU
37 Optical drive* No Yes
38 Optical drive cable* No No
39 Rear cover No Yes
40 Power cord Yes No
41 Power adapter Yes No
42 Keyboard* Yes No
43 Mouse* Yes No
* for selected models
For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go
to:
http://www.lenovo.com/serviceparts-lookup
56 M70a and M90a Hardware Maintenance Manual
Major FRUs and CRUs of M90a
Number Description Self-service CRU Optional-service CRU
1UltraFlex IV Stand* Yes No
2UltraFlex IV Stand base* Yes No
3Full-function monitor stand* Yes No
4Full-function monitor base* Yes No
5VESA mount bracket cover No Yes
6VESA mount bracket No Yes
7Cable cover No No
8Integrated camera and microphone module* No No
9Bump cover No No
10 Main frame No No
Chapter 6.Hardware removal and installation 57
Number Description Self-service CRU Optional-service CRU
11 Side I/O brackets No No
12 LCD bracket No No
13 LCD panel No No
14 Speakers No No
15 Wi-Fi antennas No No
16 Front decorative cover No No
17 LCD backlight cable No No
18 Touch board cable No No
19 LCD LVDS cable No No
20 Storage drive* No Yes
21 Storage drive cable* No No
22 Storage drive bracket No Yes
23 E-Privacy button board* No No
24 Cover presence switch (intrusion switch)* No No
25 Serial connector module* No No
26 Memory module No Yes
27 System board No No
28 Microprocessor No No
29 Wi-Fi card shield* No No
30 Wi-Fi card* No No
31 M.2 solid-state drive* No Yes
32 Card reader board* No No
33 Coin-cell battery No No
34 System fan No No
35 Heat sink No No
36 System board shield No Yes
37 Optical drive holder* No Yes
38 Optical drive bracket* No Yes
39 Optical drive* No Yes
40 Optical drive cable* No No
41 Rear cover No Yes
42 Power cord Yes No
43 Power adapter Yes No
44 Keyboard* Yes No
45 Mouse* Yes No
58 M70a and M90a Hardware Maintenance Manual
* for selected models
For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go
to:
http://www.lenovo.com/serviceparts-lookup
System board
Figure 1. M70a system board
1 LCD LVDS connector 2 Integrated camera and microphone module connector
3 Microprocessor socket 4 Serial (COM1) connector
5 Touch board connector 6 Memory slots
7 M.2 solid-state drive slot 8 M.2 Wi-Fi card slot
9 Optical drive connector 10 Clear CMOS (Complementary Metal Oxide
Semiconductor) / Recovery jumper
11 ME disable header 12 Cover presence switch connector (intrusion switch
connector)
13 Internal speaker connector 14 Storage drive connector
15 Card reader connector 16 LCD backlight connector
17 Coin-cell battery 18 System fan connector
Chapter 6.Hardware removal and installation 59
Figure 2. M90a system board
1 LCD backlight connector 2 LCD LVDS connector
3 Integrated camera and microphone module connector 4 Microprocessor socket
5 Serial (COM1) connector 6 Memory slots
7 M.2 solid-state drive slot 8 M.2 Wi-Fi card slot
9 Coin-cell battery 10 Touch board connector
11 Optical drive connector 12 Internal speaker connector
13 E-Privacy connector 14 Cover presence switch connector (intrusion switch
connector)
15 Card reader connector 16 Storage drive connector
17 ME disable header 18 Clear CMOS (Complementary Metal Oxide
Semiconductor) / Recovery jumper
19 System fan connector
Removing and installing hardware
This section provides instructions on how to remove and install hardware for your computer. You can expand
the capabilities of your computer and maintain your computer by removing or installing hardware.
Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter
1 “Important safety information” on page 1.
60 M70a and M90a Hardware Maintenance Manual
External options
You can connect external options to your computer, such as external speakers, a printer, or a scanner. For
some external options, you must install additional software in addition to making the physical connection.
When installing an external option, see Chapter 3 “Product overview” on page 29 to identify the required
connector. Then, use the instructions that come with the option to help you make the connection and install
any required software or device drivers.
Computer stand
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Turn off the computer and remove all connected devices and cables.
2. Disconnect the computer from ac power and all connected cables.
3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay
it down so that the screen is against the surface and the computer cover is facing up.
4. Depending on your computer stand, refer to one of the following to replace the computer stand.
• Full-function monitor stand
Figure 3. Removing the full-function monitor stand
Chapter 6.Hardware removal and installation 61
Figure 4. Removing the full-function monitor stand base
Figure 5. Installing the full-function monitor stand base
62 M70a and M90a Hardware Maintenance Manual
Figure 8. Removing the UltraFlex IV Stand base
Figure 9. Installing the UltraFlex IV Stand base
64 M70a and M90a Hardware Maintenance Manual
Figure 10. Installing the UltraFlex IV Stand
5. Place the computer in an upright position.
6. Reconnect the ac power adapter and all disconnected cables to the computer.
Rear cover
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
CAUTION:
Before you open the rear cover, turn off the computer and wait several minutes until the computer is
cool.
Replacement procedure
1. Turn off the computer and remove all connected devices and cables.
2. Disconnect the computer from ac power and all connected cables.
3. Unlock any locking device that secures the computer cover.
4. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay
it down so that the screen is against the surface and the computer cover is facing up.
5. Remove the computer stand. See “Computer stand” on page 61.
6. Replace the rear cover.
Chapter 6.Hardware removal and installation 65
Figure 11. Removing the rear cover
Figure 12. Installing the rear cover
7. Reinstall the computer stand. See “Computer stand” on page 61.
8. Place the computer in an upright position.
9. If a locking device is available, use it to lock the computer.
10. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Optical drive
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
66 M70a and M90a Hardware Maintenance Manual
3. Disconnect the power and signal cable from the optical drive.
4. Depending on your computer model, refer to one of the following to replace the optical drive.
• M70a
Figure 13. Removing the optical drive
Figure 14. Removing the optical drive bracket
Figure 15. Installing the optical drive bracket
Chapter 6.Hardware removal and installation 67
Figure 16. Installing the optical drive
• M90a
Figure 17. Removing the optical drive
Figure 18. Removing the optical drive bracket
68 M70a and M90a Hardware Maintenance Manual
Figure 19. Installing the optical drive bracket
Figure 20. Installing the optical drive
5. Reconnect the power and signal cable to the optical drive.
6. Reinstall the removed parts.
7. Place the computer in an upright position.
8. If a locking device is available, use it to lock the computer.
9. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Optical drive holder
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Depending on your computer model, refer to one of the following to replace the optical drive holder.
• M70a
Chapter 6.Hardware removal and installation 69
Figure 21. Removing the optical drive holder
Figure 22. Installing the optical drive holder
• M90a
70 M70a and M90a Hardware Maintenance Manual
Figure 23. Removing the optical drive holder
Figure 24. Installing the optical drive holder
5. Place the computer in an upright position.
6. If a locking device is available, use it to lock the computer.
7. Reconnect the external cables and power cords to the corresponding connectors on the computer.
System board shield
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
Chapter 6.Hardware removal and installation 71
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Depending on your computer model, refer to one of the following to replace the system board shield.
• M70a
Figure 25. Removing the system board shield
Figure 26. Installing the system board shield
72 M70a and M90a Hardware Maintenance Manual
6. Reinstall the removed parts.
7. Place the computer in an upright position.
8. If a locking device is available, use it to lock the computer.
9. Reconnect the external cables and power cords to the corresponding connectors on the computer.
VESA mount bracket cover
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
CAUTION:
Before you open the VESA mount bracket cover, turn off the computer and wait several minutes until
the computer is cool.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Depending on your computer model, refer to one of the following to replace the VESA mount bracket
cover.
• M70a
Figure 30. Opening the cable cover
74 M70a and M90a Hardware Maintenance Manual
Figure 34. Removing the VESA mount bracket cover
Figure 35. Installing the VESA mount bracket cover
7. Reinstall the removed parts.
8. Place the computer in an upright position.
9. If a locking device is available, use it to lock the computer.
10. Reconnect the external cables and power cords to the corresponding connectors on the computer.
VESA mount bracket
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
76 M70a and M90a Hardware Maintenance Manual
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Depending on your computer model, refer to one of the following to replace the VESA mount bracket.
• M70a
Figure 36. Removing the VESA mount bracket
Figure 37. Installing the VESA mount bracket
• M90a
Chapter 6.Hardware removal and installation 77
Figure 38. Removing the VESA mount bracket
Figure 39. Installing the VESA mount bracket
8. Reinstall the removed parts.
9. Place the computer in an upright position.
10. If a locking device is available, use it to lock the computer.
11. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Storage drive and storage drive bracket
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
78 M70a and M90a Hardware Maintenance Manual
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Depending on your computer model, refer to one of the following to replace the storage drive and the
storage drive bracket.
• M70a
Figure 40. Removing the storage drive and the bracket
Figure 41. Removing the storage drive from the bracket
Chapter 6.Hardware removal and installation 79
Figure 42. Disconnecting the storage drive cable
Figure 43. Connecting the storage drive cable
Figure 44. Installing the storage drive to the bracket
80 M70a and M90a Hardware Maintenance Manual
Figure 48. Disconnecting the storage drive cable
Figure 49. Connecting the storage drive cable
Figure 50. Installing the storage drive to the bracket
82 M70a and M90a Hardware Maintenance Manual
Figure 51. Installing the storage drive and the bracket
7. Reinstall the removed parts.
8. Place the computer in an upright position.
9. If a locking device is available, use it to lock the computer.
10. Reconnect the external cables and power cords to the corresponding connectors on the computer.
System fan
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Disconnect the system fan cable from the system board.
7. Depending on your computer model, refer to one of the following to replace the system fan.
• M70a
Chapter 6.Hardware removal and installation 83
Figure 52. Removing the system fan
Figure 53. Installing the system fan
• M90a
84 M70a and M90a Hardware Maintenance Manual
Figure 54. Removing the system fan
Figure 55. Installing the system fan
8. Connect the new system fan cable to the system board.
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Heat sink
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Chapter 6.Hardware removal and installation 85
The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several
minutes until the computer is cool.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Depending on your computer model, refer to one of the following to replace the heat sink.
Notes:
• Carefully remove the screws from the system board to avoid any possible damage to the system
board. The screws cannot be removed from the heat sink.
• You might have to gently twist the heat sink to free it from the microprocessor.
• Do not touch the thermal grease while handling the heat sink.
• M70a
Figure 56. Removing the heat sink
86 M70a and M90a Hardware Maintenance Manual
Figure 59. Installing the heat sink
Figure 60. Tightening the heat sink screws
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Bump cover
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
88 M70a and M90a Hardware Maintenance Manual
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Depending on your computer model, refer to one of the following to replace the bump cover.
• M70a
Figure 61. Removing the bump cover
Figure 62. Installing the bump cover
Chapter 6.Hardware removal and installation 89
• M90a
Figure 63. Removing the bump cover
Figure 64. Installing the bump cover
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
M.2 solid-state drive
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
90 M70a and M90a Hardware Maintenance Manual
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Depending on your computer model, refer to one of the following to replace the M.2 solid-state drive.
• M70a
– For M.2 solid-state drive (2280) models
Figure 65. Removing the M.2 solid-state drive
Figure 66. Installing the M.2 solid-state drive
– For M.2 solid-state drive (2242) models
Chapter 6.Hardware removal and installation 91
Figure 67. Removing the M.2 solid-state drive
Figure 68. Installing the M.2 solid-state drive
• M90a
– For M.2 solid-state drive (2280) models
92 M70a and M90a Hardware Maintenance Manual
Figure 71. Removing the M.2 solid-state drive
Figure 72. Installing the M.2 solid-state drive
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Microprocessor
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
94 M70a and M90a Hardware Maintenance Manual
CAUTION:
The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait
several minutes until the computer is cool.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the heat sink. See “Heat sink” on page 85.
9. Depending on your computer model, refer to one of the following to replace the microprocessor.
Notes:
• Your microprocessor and socket might look different from the one illustrated.
• Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom.
• Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be
kept as clean as possible.
• M70a
Figure 73. Releasing the handle
Chapter 6.Hardware removal and installation 95
Figure 74. Opening the retainer
Figure 75. Removing the microprocessor
Figure 76. Installing the microprocessor
96 M70a and M90a Hardware Maintenance Manual
Figure 79. Releasing the handle
Figure 80. Opening the retainer
Figure 81. Removing the microprocessor
98 M70a and M90a Hardware Maintenance Manual
Figure 84. Securing the retainer with the handle
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Serial connector module
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Disconnect the serial connector cable from the system board.
9. Depending on your computer model, refer to one of the following to replace the serial connector module.
• M70a
100 M70a and M90a Hardware Maintenance Manual
Figure 88. Installing the serial connector module
10. Connect the new serial connector cable to the system board.
11. Reinstall the removed parts.
12. Place the computer in an upright position.
13. If a locking device is available, use it to lock the computer.
14. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Cable cover
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Before you open the cable cover door, turn off the computer and wait several minutes until the computer is
cool.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the serial connector module. See “Serial connector module” on page 100.
9. Depending on your computer model, refer to one of the following to replace the cable cover.
• M70a
102 M70a and M90a Hardware Maintenance Manual
Figure 92. Installing the cable cover
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Memory module
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
Ensure that you follow the installation order for memory modules shown in the following figure.
104 M70a and M90a Hardware Maintenance Manual
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Depending on your computer model, refer to one of the following to replace a memory module.
• M70a
Figure 95. Removing a memory module
Figure 96. Installing a memory module
• M90a
106 M70a and M90a Hardware Maintenance Manual
Figure 97. Removing a memory module
Figure 98. Installing a memory module
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Wi-Fi card
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Chapter 6.Hardware removal and installation 107
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Depending on your computer model, refer to one of the following to replace the Wi-Fi card.
• M70a
Figure 99. Removing the Wi-Fi card shield
Figure 100. Disconnecting the Wi-Fi antenna cables
Figure 101. Removing the Wi-Fi card
Figure 102. Installing the Wi-Fi card
108 M70a and M90a Hardware Maintenance Manual
Figure 108. Installing the Wi-Fi card
Figure 109. Connecting the Wi-Fi antenna cables
Figure 110. Installing the Wi-Fi card shield
9. Reinstall the removed parts.
10. Place the computer in an upright position.
11. If a locking device is available, use it to lock the computer.
12. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Coin-cell battery
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
DANGER
If the coin-cell battery is incorrectly replaced, there is danger of an explosion. The coin-cell battery
contains a small amount of harmful substance. To avoid possible injury:
• Replace only with a battery of the type recommended by Lenovo.
• Keep the battery away from fire.
• Do not expose it to excessive heat.
• Do not expose it to water or rain.
• Do not short-circuit it.
• Do not drop, crush, puncture the battery, or make it subject to strong forces. Battery abuse or
mishandling can cause the battery to overheat, which can cause gasses or flame to "vent" from
the battery or coin-cell battery.
Note: To dispose of the coin-cell battery, refer to “Lithium coin-cell battery notice” in the Safety and
Warranty Guide.
110 M70a and M90a Hardware Maintenance Manual
Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel connector assignments (configurations). A coin-cell battery keeps this information active
when you turn off the computer.
The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell
battery lasts forever. If the coin-cell battery fails, the date and time information is lost. An error message is
displayed when you turn on the computer.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Depending on your computer model, refer to one of the following to replace the coin-cell battery.
• M70a
Figure 111. Removing the coin-cell battery
Chapter 6.Hardware removal and installation 111
Figure 112. Installing the coin-cell battery
• M90a
Figure 113. Removing the coin-cell battery
112 M70a and M90a Hardware Maintenance Manual
Figure 114. Installing the coin-cell battery
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Cover presence switch (intrusion switch)
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
7. Disconnect the cover presence switch cable (intrusion switch cable) from the system board.
8. Depending on your computer model, refer to one of the following to replace the cover presence switch
(intrusion switch).
• M70a
Chapter 6.Hardware removal and installation 113
Figure 115. Removing the cover presence switch (intrusion switch)
Figure 116. Installing the cover presence switch (intrusion switch)
• M90a
Figure 117. Removing the cover presence switch (intrusion switch)
114 M70a and M90a Hardware Maintenance Manual
Figure 118. Installing the cover presence switch (intrusion switch)
9. Connect the new cover presence switch cable (intrusion switch cable) to the system board.
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
E-Privacy button board (M90a)
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the M90a storage drive. See “Storage drive and storage drive bracket” on page 78.
7. Disconnect the e-Privacy cable from the system board.
8. Replace the e-Privacy button board.
Chapter 6.Hardware removal and installation 115
Figure 119. Removing the e-Privacy button board
Figure 120. Installing the e-Privacy button board
9. Connect the new e-Privacy cable to the system board.
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Card reader
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
116 M70a and M90a Hardware Maintenance Manual
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
7. Disconnect the card reader cable from the system board.
8. Depending on your computer model, refer to one of the following to replace the card reader.
• M70a
Figure 121. Removing the card reader
Figure 122. Installing the card reader
• M90a
Chapter 6.Hardware removal and installation 117
Figure 123. Removing the card reader
Figure 124. Installing the card reader
9. Connect the new card reader cable to the system board.
10. Reinstall the removed parts.
11. Place the computer in an upright position.
12. If a locking device is available, use it to lock the computer.
13. Reconnect the external cables and power cords to the corresponding connectors on the computer.
118 M70a and M90a Hardware Maintenance Manual
System board
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
12. Remove the microprocessor. See “Microprocessor” on page 94.
13. Remove the serial connector module. See “Serial connector module” on page 100.
14. Remove cable cover. See “Cable cover” on page 102.
15. Remove all memory modules. See “Memory module” on page 104.
16. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
17. Remove the card reader. See “Card reader” on page 116.
18. Record the cable routing and cable connections, and then disconnect all cables from the system board.
See “System board” on page 59.
19. Depending on your computer model, refer to one of the following to replace the system board.
Notes:
• Handle the system board carefully by its edges.
• The failing system board must be returned with a microprocessor socket cover to protect the pins
during shipping and handling.
• M70a
Chapter 6.Hardware removal and installation 119
Figure 125. Removing the system board
Figure 126. Installing the system board
Figure 127. Installing the system board screws
• M90a
120 M70a and M90a Hardware Maintenance Manual
Figure 128. Removing the system board
Figure 129. Installing the system board
Figure 130. Installing the system board screws
20. Route and connect all the cables to the new system board.
21. Reinstall the removed parts.
22. Place the computer in an upright position.
Chapter 6.Hardware removal and installation 121
23. If a locking device is available, use it to lock the computer.
24. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Internal speakers
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the serial connector module. See “Serial connector module” on page 100.
9. Remove cable cover. See “Cable cover” on page 102.
10. Disconnect the internal speaker cable from the system board.
11. Depending on your computer model, refer to one of the following to replace the internal speakers.
• M70a
Figure 131. Removing the internal speakers
122 M70a and M90a Hardware Maintenance Manual
12. Connect the new internal speaker cable to the system board.
13. Reinstall the removed parts.
14. Place the computer in an upright position.
15. If a locking device is available, use it to lock the computer.
16. Reconnect the external cables and power cords to the corresponding connectors on the computer.
I/O brackets (M90a)
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure of the left I/O bracket
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the serial connector module. See “Serial connector module” on page 100.
9. Remove the cable cover. See “Cable cover” on page 102.
10. Remove the internal speakers. See “Internal speakers” on page 122.
11. Replace the left I/O bracket.
Figure 135. Removing the left I/O bracket
124 M70a and M90a Hardware Maintenance Manual
Figure 136. Installing the left I/O bracket
12. Reinstall the removed parts.
13. Place the computer in an upright position.
14. If a locking device is available, use it to lock the computer.
15. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Replacement procedure of the right I/O bracket
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the card reader. See “Card reader” on page 116.
19. Remove the system board. See “System board” on page 119.
20. Replace the right I/O bracket.
Chapter 6.Hardware removal and installation 125
Figure 137. Removing the right I/O bracket
Figure 138. Removing the right I/O bracket from the main frame
Figure 139. Installing the right I/O bracket to the main frame
126 M70a and M90a Hardware Maintenance Manual
Figure 140. Installing the right I/O bracket
21. Reinstall the removed parts.
22. Place the computer in an upright position.
23. If a locking device is available, use it to lock the computer.
24. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Integrated camera and microphone module
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Disconnect the integrated camera and microphone module cable from the system board.
9. Depending on your computer model, refer to one of the following to replace the integrated camera and
microphone module.
CAUTION:
Do not pull out the integrated camera and microphone module cable with force; otherwise, the
cable may be damaged.
• M70a
Chapter 6.Hardware removal and installation 127
Figure 141. Removing the shield of the integrated camera and microphone module
Figure 142. Removing the integrated camera and microphone module
Figure 143. Installing the integrated camera and microphone module
128 M70a and M90a Hardware Maintenance Manual
Figure 147. Installing the integrated camera and microphone module
Figure 148. Installing the shield of the integrated camera and microphone module
10. Connect the new integrated camera and microphone module cable to the system board.
11. Reinstall the removed parts.
12. Place the computer in an upright position.
13. If a locking device is available, use it to lock the computer.
14. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Main frame
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
130 M70a and M90a Hardware Maintenance Manual
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the cover presence switch (intrusion switch). See “Cover presence switch (intrusion switch)” on
page 113.
19. Remove the M90a e-Privacy button board. See “E-Privacy button board (M90a)” on page 115.
20. Remove the card reader. See “Card reader” on page 116.
21. Remove the system board. See “System board” on page 119.
22. Remove the internal speakers. See “Internal speakers” on page 122.
23. Remove the M90a I/O brackets. See “I/O brackets (M90a)” on page 124.
24. Remove the integrated camera and microphone module. See “Integrated camera and microphone
module” on page 127.
25. Depending on your computer model, refer to one of the following to replace the main frame.
CAUTION:
Do not lift the top of the LCD panel so that the integrated camera and microphone module will not
be broken.
• M70a
Chapter 6.Hardware removal and installation 131
Figure 149. Removing the main frame
Figure 150. Installing the main frame
• M90a
132 M70a and M90a Hardware Maintenance Manual
Figure 151. Removing the main frame
Figure 152. Installing the main frame
26. Reinstall the removed parts.
27. Place the computer in an upright position.
28. If a locking device is available, use it to lock the computer.
29. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Front decoration cover
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
Chapter 6.Hardware removal and installation 133
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the cover presence switch (intrusion switch). See “Cover presence switch (intrusion switch)” on
page 113.
19. Remove the M90a e-Privacy button board. See “E-Privacy button board (M90a)” on page 115.
20. Remove the card reader. See “Card reader” on page 116.
21. Remove the system board. See “System board” on page 119.
22. Remove the internal speakers. See “Internal speakers” on page 122.
23. Remove the M90a I/O brackets. See “I/O brackets (M90a)” on page 124.
24. Remove the integrated camera and microphone module. See “Integrated camera and microphone
module” on page 127.
25. Remove the main frame. See “Main frame” on page 130.
26. Depending on your computer model, refer to one of the following to replace the front decoration cover.
• M70a
Figure 153. Removing the front decoration cover
134 M70a and M90a Hardware Maintenance Manual
28. Place the computer in an upright position.
29. If a locking device is available, use it to lock the computer.
30. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Wi-Fi antennas
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the cover presence switch (intrusion switch). See “Cover presence switch (intrusion switch)” on
page 113.
19. Remove the M90a e-Privacy button board. See “E-Privacy button board (M90a)” on page 115.
20. Remove the card reader. See “Card reader” on page 116.
21. Remove the system board. See “System board” on page 119.
22. Remove the internal speakers. See “Internal speakers” on page 122.
23. Remove the M90a I/O brackets. See “I/O brackets (M90a)” on page 124.
24. Remove the integrated camera and microphone module. See “Integrated camera and microphone
module” on page 127.
25. Remove the main frame. See “Main frame” on page 130.
26. Depending on your computer model, refer to one of the following to replace the Wi-Fi antennas.
• M70a
136 M70a and M90a Hardware Maintenance Manual
Figure 160. Routing the Wi-Fi antennas and cables
• M90a
Figure 161. Releasing the Wi-Fi antennas and cables
Figure 162. Removing the Wi-Fi antennas
138 M70a and M90a Hardware Maintenance Manual
Figure 163. Installing the Wi-Fi antennas
Figure 164. Routing the Wi-Fi antennas and cables
27. Reinstall the removed parts.
28. Place the computer in an upright position.
29. If a locking device is available, use it to lock the computer.
30. Reconnect the external cables and power cords to the corresponding connectors on the computer.
LCD bracket and LCD panel
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
Chapter 6.Hardware removal and installation 139
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove the cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the cover presence switch (intrusion switch). See “Cover presence switch (intrusion switch)” on
page 113.
19. Remove the M90a e-Privacy button board. See “E-Privacy button board (M90a)” on page 115.
20. Remove the card reader. See “Card reader” on page 116.
21. Remove the system board. See “System board” on page 119.
22. Remove the internal speakers. See “Internal speakers” on page 122.
23. Remove the M90a I/O brackets. See “I/O brackets (M90a)” on page 124.
24. Remove the integrated camera and microphone module. See “Integrated camera and microphone
module” on page 127.
25. Remove the main frame. See “Main frame” on page 130.
26. Remove the front decorative cover. See “Front decoration cover” on page 133.
27. Remove the Wi-Fi antennas. See “Wi-Fi antennas” on page 136.
28. Record the cable routing and cable connections, and then disconnect all cables from the LCD panel.
29. Depending on your computer model, refer to one of the following to replace the LCD bracket and LCD
panel.
• M70a
140 M70a and M90a Hardware Maintenance Manual
Figure 167. Removing the LCD bracket and LCD panel
Figure 168. Installing the LCD bracket and LCD panel
30. Route and connect all the cables to the new LCD panel.
31. Reinstall the removed parts.
32. Place the computer in an upright position.
33. If a locking device is available, use it to lock the computer.
34. Reconnect the external cables and power cords to the corresponding connectors on the computer.
142 M70a and M90a Hardware Maintenance Manual
Appendix A. Notices and trademarks
Notices
Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult
your local Lenovo representative for information on the products and services currently available in your
area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that
Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service
that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user's
responsibility to evaluate and verify the operation of any other product, program, or service.
Lenovo may have patents or pending patent programs covering subject matter described in this document.
The furnishing of this document does not give you any license to these patents. You can send license
inquiries, in writing, to:
Lenovo (United States), Inc.
8001 Development Drive
Morrisville, NC 27560
U.S.A.
Attention: Lenovo Director of Licensing
LENOVO PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow
disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to
you.
Changes are made periodically to the information herein; these changes will be incorporated in new editions
of the publication. To provide better service, Lenovo reserves the right to improve and/or modify the
products and software programs described in the manuals included with your computer, and the content of
the manual, at any time without additional notice.
The software interface and function and hardware configuration described in the manuals included with your
computer might not match exactly the actual configuration of the computer that you purchase. For the
configuration of the product, refer to the related contract (if any) or product packing list, or consult the
distributor for the product sales. Lenovo may use or distribute any of the information you supply in any way it
believes appropriate without incurring any obligation to you.
The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or
third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the
materials for this Lenovo product, and use of those Web sites is at your own risk.
© Copyright Lenovo 2021 143
Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been made
on development-level systems and there is no guarantee that these measurements will be the same on
generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.
This document is copyrighted by Lenovo and is not covered by any open source license, including any Linux
agreement(s) which may accompany software included with this product. Lenovo may update this document
at any time without notice.
For the latest information or any questions or comments, contact or visit the Lenovo Web site:
https://support.lenovo.com
Trademarks
LENOVO, LENOVO logo, THINKCENTRE, and THINKCENTRE logo are trademarks of Lenovo. Intel, Intel
SpeedStep, Optane, and Thunderbolt are trademarks of Intel Corporation or its subsidiaries in the U.S. and/
or other countries. Microsoft, Windows, Direct3D, BitLocker, and Cortana are trademarks of the Microsoft
group of companies. DisplayPort and VESA are trademarks of the Video Electronics Standards Association.
Wi-Fi, Wi-Fi Alliance, WiGig, and Miracast are registered trademarks of Wi-Fi Alliance. USB-C is a trademark
of USB Implementers Forum. All other trademarks are the property of their respective owners. © 2021
Lenovo.
144 M70a and M90a Hardware Maintenance Manual
