About this manual
Chapter 1. Safety information
Chapter 2. Important service information
- Strategy for replacing FRUs
- Strategy for replacing FRUs for CTO, special-bid, and standard models
  - Product definition
  - FRU identification
Chapter 3. General checkout
Chapter 4. Related service information
Chapter 5. Use the keyboard shortcuts
Chapter 6. Locations
Chapter 7. FRU replacement notices
Chapter 8. Removing or replacing a FRU
Appendix A. Notices
Appendix B. Abbreviation table

Lenovo L14 User Manual

Displayed below is the user manual for L14 by Lenovo which is a product in the Notebooks category. This manual has pages.

Related Manuals

Lenovo L14 Manual

L14 Gen 2 and L15 Gen 2

Hardware Maintenance Manual

Note: Before using this information and the product it supports, be sure to read the general information

under Appendix A “Notices” on page 119.

Third Edition (May 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. Safety information . . . . . . 1

General safety . . . . . . . . . . . . . . . . 1

Electrical safety . . . . . . . . . . . . . . . . 1

Safety inspection guide . . . . . . . . . . . . . 2

Handling devices that are sensitive to electrostatic

discharge . . . . . . . . . . . . . . . . . . 3

Grounding requirements . . . . . . . . . . . . 4

Safety notices (multilingual translations) . . . . . . 4

Chapter 2. Important service

information . . . . . . . . . . . . . . . 21

Strategy for replacing FRUs . . . . . . . . . . 21

Strategy for replacing a hard disk drive or a

solid-state drive . . . . . . . . . . . . . 21

Important notice for replacing a system

board . . . . . . . . . . . . . . . . . 22

How to use error message . . . . . . . . . 22

Strategy for replacing FRUs for CTO, special-bid,

and standard models. . . . . . . . . . . . . 22

Product definition . . . . . . . . . . . . 22

FRU identification . . . . . . . . . . . . 23

Chapter 3. General checkout . . . . . 25

What to do first . . . . . . . . . . . . . . . 25

Checkout guide . . . . . . . . . . . . . . . 26

Diagnosing problems . . . . . . . . . . . 26

Quick test programs . . . . . . . . . . . 27

UEFI diagnostic program . . . . . . . . . 27

Bootable diagnostic programs . . . . . . . 27

Power system checkout . . . . . . . . . . . 28

Checking the ac power adapter . . . . . . . 28

Checking the built-in battery and operational

charging . . . . . . . . . . . . . . . . 29

Checking the coin-cell battery . . . . . . . 29

Chapter 4. Related service

information . . . . . . . . . . . . . . . 31

Reset or restore Windows . . . . . . . . . . . 31

Passwords. . . . . . . . . . . . . . . . . 31

Power-on password . . . . . . . . . . . 31

Hard disk password . . . . . . . . . . . 31

Supervisor password . . . . . . . . . . . 32

System management password. . . . . . . 32

How to remove the power-on password . . . 32

How to remove the hard disk password. . . . 33

How to remove the system management

password . . . . . . . . . . . . . . . 33

Power management . . . . . . . . . . . . . 34

Sleep mode . . . . . . . . . . . . . . 34

Hibernation mode . . . . . . . . . . . . 35

Symptom-to-FRU index . . . . . . . . . . . 35

Numeric error codes . . . . . . . . . . . 36

Error messages . . . . . . . . . . . . . 37

Beep errors. . . . . . . . . . . . . . . 37

No-beep symptoms . . . . . . . . . . . 39

LCD-related symptoms . . . . . . . . . . 39

Intermittent problems . . . . . . . . . . . 40

Undetermined problems . . . . . . . . . 40

Chapter 5. Use the keyboard

shortcuts . . . . . . . . . . . . . . . . 43

Chapter 6. Locations . . . . . . . . . 47

Locating computer controls, connectors, and

indicators . . . . . . . . . . . . . . . . . 47

Front view . . . . . . . . . . . . . . . 47

Side view . . . . . . . . . . . . . . . 49

Bottom view . . . . . . . . . . . . . . 51

Locating FRUs and CRUs . . . . . . . . . . . 51

Major FRUs and CRUs (for L14 Gen 2) . . . . 53

Major FRUs and CRUs (for L15 Gen 2) . . . . 56

LCD FRUs . . . . . . . . . . . . . . . 59

Miscellaneous parts . . . . . . . . . . . 60

Connector and cable guide . . . . . . . . 61

Looking up FRU information . . . . . . . . . . 66

Chapter 7. FRU replacement

notices . . . . . . . . . . . . . . . . . 67

Service tool kit . . . . . . . . . . . . . . . 67

Screw notices . . . . . . . . . . . . . . . 67

Retaining serial numbers . . . . . . . . . . . 68

Restoring the serial number of the system

unit . . . . . . . . . . . . . . . . . . 68

Retaining the UUID. . . . . . . . . . . . 69

Reading or writing the ECA information . . . . 70

Chapter 8. Removing or replacing a

FRU. . . . . . . . . . . . . . . . . . . 71

General guidelines. . . . . . . . . . . . . . 71

Before servicing the computer . . . . . . . . . 72

Disabling the built-in battery . . . . . . . . 72

Removing the nano-SIM card and nano-SIM-

card tray . . . . . . . . . . . . . . . . 72

Removing the microSD card . . . . . . . . 72

1010 Keyboard . . . . . . . . . . . . . . . 73

1020 Base cover assembly . . . . . . . . . . 74

1030 Wireless-LAN card . . . . . . . . . . . 76

1040 Wireless-WAN card (for selected models) . . 76

1050 Memory module . . . . . . . . . . . . 77

1060 I/O bracket . . . . . . . . . . . . . . 78

1070 Storage drive . . . . . . . . . . . . . 79

1080 USB and audio card bracket (for L15 Gen

2) . . . . . . . . . . . . . . . . . . . . 81

1090 USB and audio card . . . . . . . . . . . 82

1100 Speaker assembly . . . . . . . . . . . 83

1110 Thermal fan assembly . . . . . . . . . . 84

1120 Built-in battery . . . . . . . . . . . . . 86

1130 Coin-cell battery . . . . . . . . . . . . 86

1140 NFC cable, NFC module and NFC antenna . . 87

1150 Trackpad cable and Trackpad . . . . . . . 89

1160 Fingerprint reader cable, bracket and

module . . . . . . . . . . . . . . . . . . 91

1170 Power button card with cable . . . . . . . 94

1180 Smart card reader,cable and bracket . . . . 96

1190 System board . . . . . . . . . . . . . 99

1200 LCD unit . . . . . . . . . . . . . . . 103

2010 LCD bezel . . . . . . . . . . . . . . . 107

2020 LCD panel and LCD elastic adhesive

tapes . . . . . . . . . . . . . . . . . . . 108

2030 Camera/microphone module . . . . . . . 110

2040 Camera/LCD cable . . . . . . . . . . . 111

2050 Hinges . . . . . . . . . . . . . . . . 113

2060 Wireless antenna assembly . . . . . . . . 115

Appendix A. Notices . . . . . . . . . . 119

Appendix B. Abbreviation table . . . . 121

ii L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

About this manual

This manual contains service and reference information for the following ThinkPad® products.

ThinkPad L14 Gen 2 Machine Types (MT): 20X1, 20X2, 20X5 and 20X6

ThinkPad L15 Gen 2 Machine Types (MT): 20X3, 20X4, 20X7 and 20X8

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 ThinkPad products. Use

this manual along with the advanced diagnostic tests to troubleshoot problems effectively.

• Depending on the model, some hardware configuration and software programs might not be available on

the computer. Some statements in this manual might not be applicable to the computer.

• Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety

information” on page 1 and Chapter 2 “Important service information” on page 21.

• ThinkPad L14 Gen 2 and ThinkPad L15 Gen 2 might be shipped with different microprocessors, namely

Intel® and Advanced Micro Devices (AMD). Hereby Intel models and AMD models are used to distinguish

computer models with different microprocessors.

iv L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 1. Safety information

This chapter presents following safety information that you need to be familiar with before you service a

ThinkPad notebook computer.

• “General safety” on page 1

• “Electrical safety” on page 1

• “Safety inspection guide” on page 2

• “Handling devices that are sensitive to electrostatic discharge” on page 3

• “Grounding requirements” on page 4

• “Safety notices (multilingual translations)” on page 4

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. Make sure that 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. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you

think is 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, make sure that other service technicians 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 toolcase 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. Make sure 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, about 8

centimeters (3 inches) from the end.

• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.

Attention: 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.

• Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan

louvers or cover them with labels or stickers.

Electrical safety

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 main units

• 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.

Attention: 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.

Attention: An electrical shock can occur only when there is a complete circuit. By observing the above

rule, you may prevent a current from passing through your body.

– When using testers, 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; Instructions for these

precautions 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.

• 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

– Similar units as listed above

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 purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each

machine was designed and built, required safety items were installed to protect users and service

technicians from injury. This guide addresses only those items. You should use good judgment to identify

potential safety hazards due to attachment of non-ThinkPad 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.

2L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

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 cathode ray tube (CRT) face or a bulging capacitor

• Mechanical hazards, such as loose or missing hardware

To determine whether there are any potentially unsafe conditions, use the following checklist at the

beginning of every service task. 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. Turn 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 the frame ground.

b. The power cord should be the authorized type specified for your computer. Go to: https://

support.lenovo.com/partslookup

c. Insulation must not be frayed or worn.

4. Check for cracked or bulging batteries.

5. Remove the cover.

6. Check for any obvious non-ThinkPad alterations. Use good judgment as to the safety of any non-

ThinkPad alterations.

7. 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.

8. Check for worn, frayed, or pinched cables.

9. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered

with.

Handling devices that are sensitive to electrostatic discharge

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.

• 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 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 to guard against ESD damage is desirable but not necessary.

– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.

Chapter 1.Safety information 3

– When working on a double-insulated or battery-operated system, use an ESD common ground or

reference point. 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 (multilingual translations)

The safety notices in this section are provided in the following languages:

• English

• Arabic

• Brazilian Portuguese

• French

• German

• Hebrew

• Japanese

• Korean

• Spanish

• Traditional Chinese

DANGER

4L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

DANGER

Chapter 1.Safety information 5

6L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

PERIGO

Chapter 1.Safety information 7

PERIGO

8L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

PERIGO

DANGER

Chapter 1.Safety information 9

DANGER

VORSICHT

10 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

VORSICHT

Chapter 1.Safety information 11

VORSICHT

12 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 1.Safety information 13

14 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 1.Safety information 15

16 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 1.Safety information 17

18 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 1.Safety information 19

20 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 2. Important service information

This chapter introduces following important service information that applies to all machine types supported

by this manual:

• “Strategy for replacing FRUs” on page 21

– “Strategy for replacing a hard disk drive or a solid-state drive” on page 21

– “Important notice for replacing a system board” on page 22

– “How to use error message” on page 22

• “Strategy for replacing FRUs for CTO, special-bid, and standard models” on page 22

– “Product definition” on page 22

– “FRU identification” on page 23

Important:

• If the computer is equipped with both a hard disk drive and an M.2 solid-state drive, do not use the M.2

solid-state drive as a bootable device. The M.2 solid-state drive is designed and developed for “cache”

function purpose only.

• Advise customers to contact the Lenovo Customer Support Center if they need any assistance in

obtaining or installing any software fixes, drivers, and Unified Extensible Firmware Interface basic input

output system (UEFI BIOS) downloads. Telephone numbers for Lenovo Support are available at: https://

pcsupport.lenovo.com/supportphonelist

• System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo

authorized service technicians are available in the following support site:

https://www.lenovoservicetraining.com/ion/

Strategy for replacing FRUs

Before replacing parts:

Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing 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

completing the service action.

To download software fixes, drivers, and UEFI BIOS, go to https://support.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 before replacing a hard disk drive or a solid-state drive. This will cause all

customer data on the drive to be lost. Be sure that the customer has a current backup of the data before

doing this task.

Attention: The drive startup sequence in the computer you are servicing may 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 Maintenance Utility 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/

HT506954 for instructions on how to do that. As an alternative, you also can use the Golden Key U1 tool for

that purpose. 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 BGA (Ball Grid Array)

chipset.

How to use error message

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 may also cause false error

codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index

for the computer you are servicing.

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 is a unique configuration that has been negotiated between Lenovo and the customer. A unique

machine type model (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).

22 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

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.

Chapter 2.Important service information 23

24 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 3. General checkout

This chapter introduces following information:

• “What to do first” on page 25

• “Checkout guide” on page 26

– “Diagnosing problems” on page 26

– “Quick test programs” on page 27

– “UEFI diagnostic program” on page 27

– “Bootable diagnostic programs” on page 27

• “Power system checkout” on page 28

Before you go to the checkout guide, be sure to read the following important notes.

Important notes:

• Only certified trained personnel should service the computer.

• Before replacing any FRU, read the entire page on removing and replacing FRUs.

• When you replace FRUs, it is recommended use new nylon-coated screws.

• Be extremely careful during such write operations as copying, saving, or formatting. The sequence

of the drives in the computer that you are servicing might have been altered. If you select an incorrect

drive, data or programs might be overwritten.

• Replace a FRU only with another FRU of the correct model. When you replace a FRU, ensure that the

model of the machine and the FRU part number are correct by referring to the Web site: https://

support.lenovo.com/partslookup

• A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur

for a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation,

electrostatic discharge, or software errors. Consider replacing a FRU only when a problem recurs. If you

suspect that a FRU is defective, clear the error log and run the test again. If the error does not recur, do

not replace the FRU.

• Be careful not to replace a nondefective FRU.

What to do first

When you return a FRU, you must include the following information in the parts exchange form or parts return

form that you attach to it:

1. Name and phone number of service technician

2. Date of service

3. Date on which the machine failed

4. Date of purchase

5. Failure symptoms, error codes appearing on the display, and beep symptoms

6. Procedure index and page number in which the failing FRU was detected

7. Failing FRU name and part number

8. Machine type, model number, and serial number

9. Customer's name and address

Note: During the warranty period, the customer may be responsible for repair costs if the computer damage

was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper

maintenance by the customer. Following is a list of some common items that are not covered under warranty

and some symptoms that might indicate that the system was subjected to stress beyond normal use.

Before checking problems with the computer, determine whether the damage is covered under the warranty

by referring to the following list:

The following are not covered under warranty:

• LCD panel cracked from the application of excessive force or from being dropped

• Scratched (cosmetic) parts

• Distortion, deformation, or discoloration of the cosmetic parts

• Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force

• Damage caused by liquid spilled into the system

• Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an

incompatible card

• Improper disc insertion or use of an external optical drive

• Fuses blown by attachment of a nonsupported device

• Forgotten computer password (making the computer unusable)

• Sticky keys caused by spilling a liquid onto the keyboard

• Use of an incorrect ac power adapter on laptop products

The following symptoms might indicate damage caused by nonwarranted activities:

• Missing parts might be a symptom of unauthorized service or modification.

• Check for obvious damage to a hard disk drive. If the spindle of a hard disk drive becomes noisy, the hard

disk drive might have been dropped or subject to excessive force.

Checkout guide

Use the following procedures as a guide in identifying and correcting problems with the ThinkPad notebook

computers.

Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products,

prototype cards, or modified options can lead to false indications of errors and invalid system responses.

1. Identify the failing symptoms in as much detail as possible.

2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the

operation.

Diagnosing problems

Many computer problems can be solved without outside assistance. If you experience a problem with your

computer, the first place to start is the troubleshooting information in your computer documentation. If you

suspect a software problem, see the documentation, including readme files and help information systems,

that come with the operating system or program.

Lenovo Vantage is preinstalled on your computer. It supports the hardware scan function. It combines

diagnostic tests, system information collection, security status, and support information, along with hints and

tips for optimal system performance.

Note: If you are unable to isolate and repair the problem yourself after running the program, save and print

the log files created by the program. You need the log files when you speak to a Lenovo technical support

representative.

The troubleshooting information or the diagnostic programs might tell you that you need additional or

updated device drivers or other software. You can get the latest technical information and download device

drivers and updates from the Lenovo Support Web site at:

https://support.lenovo.com

For additional information, see the help system of the program.

26 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Quick test programs

Run quick test programs to troubleshoot and resolve computer problems, especially when the computer

does not have the Lenovo Vantage program installed.

To download and install a quick test program, go to https://www.lenovo.com/diags, and follow the instructions

on the Web site.

To run a test using quick test program, do the following:

1. Go to the C:\SWTOOLS\ldiag directory.

2. Double-click the lsc_lite.exe file.

3. When the User Account Control window opens, click Yes.

4. Select the device class to be tested.

5. Select the devices to be tested.

6. Select the test to be performed.

7. Follow the instructions on the screen to start the test. When a problem is detected, information

messages are displayed. Refer to the messages to troubleshoot the problem.

UEFI diagnostic program

A UEFI diagnostic program is preinstalled on the computer. It enables you to test memory modules and

internal storage devices, view system information, and check and recover bad sectors on internal storage

devices.

To run the UEFI diagnostic program, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page 28,

and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 35

for error code descriptions and troubleshooting hints.

2. When the logo screen is displayed, repeatedly press and release the F10 key. The main screen of the

UEFI diagnostic program is displayed.

3. Follow the instructions on the screen to use the diagnostic program.

The options on the main screen are as follows:

Table 1. Items on the main screen of the UEFI diagnostic program

Tests Tools

• Quick Memory Test

• Quick Storage Device Test

• LCD test

• PCI-e test

• Exit Application

• System Information

• Generate configuration file

• Execute from configuration file

• Recover Bad Sectors Tool*

* Recover Bad Sectors Tool is only available on computers that have hard disk drives installed.

Bootable diagnostic programs

If the computer you are servicing is not installed with the UEFI diagnostic program, you can download a

bootable diagnostic program from the Lenovo Support Web site. The bootable diagnostic programs enable

you to test computer memory and internal storage devices, view system information, and check and recover

the internal storage devices. To use the bootable diagnostic programs, you can create a bootable diagnostic

medium on a Universal Serial Bus (USB) device or CD.

Chapter 3.General checkout 27

To create a bootable diagnostic medium, do the following:

1. Go to https://www.lenovo.com/diags.

2. Click Lenovo Bootable Diagnostics.

3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or CD.

To use the diagnostic medium you have created, do one of the following:

• If you have created the bootable diagnostic medium on a USB device, do the following:

1. Attach the USB device to the computer.

2. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page

28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on

page 35 for error code descriptions and troubleshooting hints.

3. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu

window opens, release the F12 key.

4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will be

launched automatically.

5. Follow the instructions on the screen to use the diagnostic program.

• If you have created the bootable diagnostic medium on a CD, do the following:

1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page

28, and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on

page 35 for error code descriptions and troubleshooting hints.

2. Connect an external optical drive to the computer, and insert the CD into the optical drive.

3. Restart the computer.

4. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu

window opens, release the F12 key.

5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program will

be launched automatically.

6. Follow the instructions on the screen to use the diagnostic program.

Power system checkout

To verify if a battery or an ac power adapter is functional, do the following:

1. Turn off the computer.

2. Remove the battery pack.

3. Connect the ac power adapter. If the computer can be turned on, it means that the ac power adapter is

functional.

4. Turn off the computer.

5. Disconnect the ac power adapter and install the charged battery pack.

6. Turn on the computer. If the computer can be turned on, it means that the battery pack is functional.

If you suspect a power problem, see the appropriate one of the following power supply checkouts:

• “Checking the ac power adapter” on page 28

• “Checking the built-in battery and operational charging” on page 29

• “Checking the coin-cell battery” on page 29

Checking the ac power adapter

You are here because the computer fails only when the ac power adapter is used.

• If the power problem occurs only when the docking station or the port replicator is used, replace the

docking station or the port replicator.

28 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

• If the system status indicator does not blink three times when an ac power source is connected, check the

power cord of the ac power adapter for correct continuity and installation.

• If the computer does not charge during operation, go to “Checking the built-in battery and operational

charging” on page 29.

Note: Noise from the ac power adapter does not always indicate a defect.

Checking the USB-C type ac power adapter

To check the USB-C type ac power adapter, do the following:

1. Connect the computer to a power outlet and turn on the computer.

2. Start Lenovo Vantage program, and then click Hardware Settings ➙ Power. The ac power adapter

information is displayed.

Ensure that you use the USB-C type ac power adapter that is shipped with the computer to provide enough

power to the computer. Otherwise, a message will be displayed, prompting you that the computer will not be

charged or will be charged slowly.

Checking the built-in battery and operational charging

This computer supports only batteries specially designed for this specific system and manufactured by

Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed

for other systems. If an unauthorized battery or a battery designed for another systems is installed, the

system will not charge.

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and

provides no warranties for failures or damage arising out of their use.

Move your pointer to the battery-status icon in the Windows notification area to check the battery status. The

battery-status icon displays the percentage of battery power remaining and how long you can use your

computer before you must charge the battery.

To check whether the battery charges properly during operation, do the following:

1. Discharge the battery until the remained battery power is less than 50%.

2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows

notification area indicates that the battery is not charging, remove the battery and let it return to room

temperature.

Note: The built-in battery is NOT customer replaceable. Contact a qualified Lenovo technician to

replace the built-in battery.

3. Reinstall the battery. If the battery is still not charging, replace the battery pack.

4. Check the battery status icon again. If the same error still exists, replace the system board.

Checking the coin-cell battery

To check the coin-cell battery, do the following:

1. Remove the coin-cell battery. See “1130 Coin-cell battery” on page 86.

2. Measure the voltage of the coin-cell battery. See the following illustration.

Chapter 3.General checkout 29

Wire Voltage (V dc)

Red +2.5 to +3.2

Black Ground

• If the voltage is correct, replace the system board.

• If the voltage is not correct, replace the coin-cell battery.

• If the coin-cell battery discharges quickly after replacement, replace the system board.

30 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 4. Related service information

This chapter presents following information:

• “Reset or restore Windows” on page 31

• “Passwords” on page 31

• “Power management” on page 34

• “Symptom-to-FRU index” on page 35

Service Web site: When the latest maintenance diskette and the system program service diskette become

available, they will be posted on https://support.lenovo.com

Reset or restore Windows

To reset or restore Windows, refer to the information below：

• Use Lenovo recovery options.

1. Go to https://support.lenovo.com/HowToCreateLenovoRecovery.

2. Follow the on-screen instructions.

• Use Window recovery options.

1. Go to https://pcsupport.lenovo.com.

2. Detect your computer or manually select your computer model.

3. Click Diagnostics ➙ Operating system Diagnostics and then follow the on-screen instructions.

Passwords

As many as four passwords may be needed for any ThinkPad notebook computer: the power-on password,

the hard disk password, and the supervisor password, and the system management password.

If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the

computer is turned on. The computer does not start until the password is entered.

Note: If only a supervisor password is set, the password prompt will not be displayed when the operating

system is started.

Power-on password

A power-on password protects the system from being powered on by an unauthorized person. The

password must be entered before an operating system can be started. For instructions on how to remove the

power-on password, see “How to remove the power-on password” on page 32.

Hard disk password

There are two kinds of hard disk passwords:

• User hard disk password - for the user

• Master hard disk password - for the system administrator, who can use it to get access to the hard disk

even if the user has changed the user hard disk password

Note: There are two modes for the hard disk password: User only and Master + User. The Master + User

mode requires two hard disk passwords; the system administrator enters both in the same operation. The

system administrator then provides the user hard disk password to the system user.

Attention: If the user hard disk password has been forgotten, check whether a master hard disk password

has been set. If it has, it can be used for access to the hard disk drive. If no master hard disk password is

available, neither Lenovo nor Lenovo authorized service technicians provide any services to reset either the

user or the master hard disk password, or to recover data from the hard disk drive. The hard disk drive can

be replaced for a scheduled fee.

For how to remove the hard disk password, see “How to remove the hard disk password” on page 33.

Supervisor password

The supervisor password protects the system information stored in the ThinkPad Setup program. It provides

the following security features:

• If only a supervisor password is set, a password prompt is displayed when you try to start the ThinkPad

Setup program. Unauthorized users cannot change most of the system configuration options in the

ThinkPad Setup program without the password.

• The system administrator can use the supervisor password to access a computer even if the user of that

computer has set a power-on password. The supervisor password overrides the power-on password.

• The system administrator can set the same supervisor password on many ThinkPad notebook computers

to make administration easier.

Attention: If the supervisor password has been forgotten and cannot be made available to the service

technician, there is no service procedure to reset the password. The system board must be replaced for a

scheduled fee.

System management password

The system management password can also protect the system information stored in UEFI BIOS like a

supervisor password, but it has lower authority by default. The system management password can be set

through the UEFI BIOS menu or through Windows Management Instrumentation (WMI) with the Lenovo

client-management interface.

You can enable the system management password to have the same authority as the supervisor password

to control security related features. To customize the authority of the system management password through

the UEFI BIOS menu:

1. Enter the UEFI BIOS menu.

Note: When prompted to enter the password, enter the correct supervisor password if a supervisor

password has been set, or enter the correct system management password if no supervisor password

has been set. Otherwise, you cannot change the configurations in the following steps.

2. Select Security ➙ Password ➙ System Management Password Access Control.

3. Follow the on-screen instructions.

If you have set both the supervisor password and the system management password, the supervisor

password overrides the system management password. If you have set both the system management

password and the power-on password, the system management password overrides the power-on

password.

How to remove the power-on password

To remove a power-on password, do the following:

If no supervisor password has been set, do the following to remove the power-on password:

1. Turn off the computer and disconnect the ac power.

32 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

2. Disable the built-in battery. See “Disabling the built-in battery” on page 72.

3. Remove the base cover assembly. See “1020 Base cover assembly” on page 74.

4. Remove the built-in battery. For instructions on how to remove the built-in battery, see “1120 Built-in

battery” on page 86.

5. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see “1130 Coin-

cell battery” on page 86. Wait for a few seconds.

6. Reinstall the coin-cell battery. For instructions on how to install the coin-cell battery, see “1130 Coin-cell

battery” on page 86.

7. Reinstall the built-in battery. For instructions on how to install the built-in battery, see “1120 Built-in

battery” on page 86.

8. Turn on the computer and wait until the power-on self-test (POST) ends. After the POST ends, the

password prompt does not appear. The power-on password has been removed.

If a supervisor password or a system management password has been set and is known to the service

technician, do the following to remove the power-on password:

1. Turn on the computer.

2. When the logo screen comes up, immediately press F1.

3. Type the supervisor password to enter the ThinkPad Setup program.

4. Select Security.

5. Select Password.

6. Select Power-On Password.

7. Type the current supervisor password or the system management password in the Enter Current

Password field. then leave the Enter New Password field blank, and press Enter twice.

8. In the Changes have been saved window, press Enter.

9. Press F10 to save changes and exit the ThinkPad Setup program.

How to remove the hard disk password

Attention: If User only mode is selected and the user hard disk password has been forgotten and cannot be

made available to the service technician, neither Lenovo nor Lenovo authorized service technicians provide

any services to reset the user hard disk passwords or to recover data from the hard disk drive. To put the

system back to operational status, the only Lenovo and Lenovo-authorized service solution would be to

replace the hard disk drive or solid-state drive with a scheduled fee.

To remove a user hard disk password that has been forgotten, when the supervisor password and master

hard disk password are known, do the following:

1. Turn on the computer.

2. When the logo screen comes up, immediately press F1 to enter the ThinkPad Setup program.

3. Select Security.

4. Select Password.

5. Select Hard disk x password, where x is the letter of the hard disk drive. A pop-up window opens.

6. Select Master hard disk password.

7. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter

New Password field blank, and press Enter twice.

8. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the

master hard disk password have been removed.

How to remove the system management password

To remove a system management password, do the following:

Chapter 4.Related service information 33

If no supervisor password has been set, do the following to remove the system management password:

1. Turn off the computer and disconnect ac power.

2. Disable the built-in battery. See “Disabling the built-in battery” on page 72.

3. Remove the base cover assembly. See “1020 Base cover assembly” on page 74.

4. Remove the built-in battery. See “1120 Built-in battery” on page 86.

5. Remove the coin-cell battery. See “1130 Coin-cell battery” on page 86.

6. Reinstall the coin-cell battery.

7. Reinstall the built-in battery.

8. Reinstall the base cover assembly.

9. Reconnect ac power.

10. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does

not appear. The system management password has been removed.

If a supervisor password has been set and is known to the service technician, do the following to remove the

system management password:

1. Turn on the computer.

2. When the ThinkPad logo is displayed, immediately press F1.

3. Type the supervisor password to enter the ThinkPad Setup program.

4. Select Security.

5. Select Password.

6. Select System Management Password.

7. Type the current supervisor password in the Enter Current Password field. Then leave the Enter New

Password field blank, and press Enter twice.

8. In the Changes have been saved window, press Enter.

9. Press F10 to save changes and exit the ThinkPad Setup program. The system management password

has been removed.

Power management

To reduce power consumption, the computer has two power management modes: sleep and hibernation.

Sleep mode

When the computer enters sleep mode, the following events occur:

• The LCD is powered off.

• The hard disk drive or solid-state drive is powered off.

• The microprocessor stops.

To put your computer into sleep mode, do one of the following:

• Press Fn+4.

• Open the Start menu, click Power, and then click Sleep.

To return to normal operation, press the Fn key only.

In certain circumstances, the computer goes into sleep mode automatically:

• After a period of inactivity specified in power plan settings

• When the battery power is low

34 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Hibernation mode

In hibernation mode, the following occurs:

• The system status, random access memory (RAM), video random access memory (VRAM), and setup data

are stored on the hard disk drive or solid-state drive.

• The system is powered off.

Note: If the computer enters the hibernation mode while it is docked to the docking station or the port

replicator, do not undock it before resuming normal operation. If you do undock it and then try to resume

normal operation, you will get an error message, and you will have to restart the system.

If you have defined one of the following actions as the event that causes the system to go into hibernation

mode, perform that action.

• Closing the lid.

• Pressing the power button.

Also, the computer goes into hibernation mode automatically after a period of inactivity specified in power

plan settings.

When the power is turned on, the computer returns from hibernation mode and resumes operation. The

hibernation file in the boot record on the hard disk drive or solid-state drive is read, and system status is

restored from the hard disk drive or solid-state drive.

Symptom-to-FRU index

This section contains following information:

• “Numeric error codes” on page 36

• “Beep errors” on page 37

• “No-beep symptoms” on page 39

• “LCD-related symptoms” on page 39

• “Intermittent problems” on page 40

• “Undetermined problems” on page 40

The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most

likely cause is listed first, in boldface type.

Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or

action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the

computer. Do not replace a nondefective FRU.

This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced

next.

A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be

any number.

If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not

described there, go to “Intermittent problems” on page 40.

Note: For a device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual

for that device.

Chapter 4.Related service information 35

Numeric error codes

Table 2. Numeric error codes

Symptom or error FRU or action, in sequence

0177

Bad SVP data, stop POST task—The checksum of the

supervisor password in the EEPROM is not correct.

Replace the system board.

0183

Bad CRC of Security Settings in EFI Variable. Enter the

ThinkPad Setup program. – The checksum of the Security

settings in the EFI Variable is not correct.

1. Run the ThinkPad Setup program. The settings

will be corrected automatically. Then save the

current settings by pressing F10.

2. Replace the system board.

0187

EAIA data access error—The access to EEPROM is failed.

Replace the system board.

0188

Invalid RFID Serialization Information Area.

Replace the system board.

0189

Invalid RFID configuration information area—The

EEPROM checksum is not correct.

Replace the system board.

0190

Critical low-battery error

1. Charge the battery pack.

2. Replace the battery pack.

0191

System Security—Invalid Remote Change requested.

1. Run the ThinkPad Setup program, and then save

current setting by pressing F10.

2. Replace the system board.

0199

System Security— Security password retry count

exceeded.

1. Run the ThinkPad Setup program. The retry count

will be reset. Then save the current settings by

pressing F10.

2. Replace the system board.

0270

Real Time Clock Error— System Real Time Clock is not

functional.

Have the computer serviced.

0271

Check Date and Time settings— Neither the date nor the

time is set in the computer.

Set the date and time, using ThinkPad Setup.

1802

Unauthorized network card is plugged in—Turn off and

remove the network card.

1. Remove network card.

2. Replace the system board.

1820

More than one external fingerprint reader is attached.

Power off and remove all but the reader that you set up

within your main operating system.

Remove all but the reader that you set up for the

authentication.

2100

Detection error on HDD0 (Main HDD)

Have the hard disk drive serviced.

2101

Detection error on HDD1 (Main HDD)

1. Reseat the M.2 solid-state drive.

2. Replace the solid-state drive.

3. Replace the system board.

2102

Detection error on Storage Device0 (M.2 Main Slot)

1. Reseat the M.2 solid-state drive.

2. Replace the solid-state drive.

3. Replace the system board.

36 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Table 2. Numeric error codes (continued)

Symptom or error FRU or action, in sequence

2110

Read error on HDD0 (Main HDD)

1. Reseat the hard disk drive.

2. Replace the main hard disk drive.

3. Replace the system board.

2111

Read error on HDD1 (Main HDD)

1. Reseat the M.2 solid-state drive.

2. Replace the solid-state drive.

3. Replace the system board.

2112

Read error on Storage Device0 (M.2 Main Slot)

1. Reseat the M.2 solid-state drive.

2. Replace the solid-state drive.

3. Replace the system board.

2200

Machine Type and Serial Number are invalid.

Replace the system board.

2201

Machine UUID is invalid

Replace the system board.

Error messages

Table 3. Error messages

Symptom or error FRU or action, in sequence

Fan error. 1. Replace the thermal fan assembly.

2. Apply thermal grease.

3. Replace the system board.

Thermal sensing error. Replace the system board.

Bottom Cover Tamper Detection Error Replace the system board

Error: The non-volatile system UEFI variable storage is

nearly full.

Note: This error indicates that the operating system or

applications cannot create, modify, or delete data in the

non-volatile system UEFI variable storage due to

insufficient storage space after the POST.

Press F1 to enter ThinkPad Setup after the error message

is displayed. A dialog asks the user for confirmation to

clean up the storage. If the user selects “Yes”, all data

that were created by the operating system or applications

are deleted except global variables defined by the Unified

Extensible Firmware Interface Specification. If the user

selects “No”, all data is kept, but the operating system or

applications will not be able to create, modify, or delete

data in the storage.

If this error happens at a service center, Lenovo

authorized service personnel will clean up the non-volatile

system UEFI variable storage using the above solution.

Beep errors

Lenovo SmartBeep technology enables you to decode beep errors with your smartphone when a black

screen occurs with beeps from your computer. To decode the beep error with Lenovo SmartBeep

technology, do the following:

1. Go to https://support.lenovo.com/smartbeep or scan the following QR Code.

Chapter 4.Related service information 37

2. Download the proper diagnostic app and install it on your smartphone.

3. Run the diagnostic app and place the smartphone near the computer.

4. Press the Fn key on your computer to emit the beep again. The diagnostic app decodes the beep error

and shows possible solutions on the smartphone.

The following section describes some beep errors and the corresponding solutions.

Note: Do not attempt to service a product yourself unless instructed to do so by the Customer Support

Center or product documentation. Only use a Lenovo-authorized service provider to repair your product.

Error codes Solutions

0001: Reset error (platform reset not de-asserted) 1. Remove all power resources (the ac power adapter

and the removable battery). Reset the computer by

doing one of the following:

• For models with the emergency-reset hole,

insert a straightened paper clip into the

emergency-reset hole. Wait for one minute.

Then, reconnect all power resources and restart

the computer.

• For models without the emergency-reset hole,

press and hold the power button for about

seven seconds. Then, reconnect to all power

resources and restart the computer.

2. Replace the system board (service provider only).

0002: Internal bus error Replace the system board (service provider only).

0281: General embedded controller error Replace the system board (service provider only).

0282: Memory module error 1. Reinstall or replace the memory module.

2. Replace the system board (service provider only).

0283: PCI resource error 1. Remove PCIe devices (the M.2 card, PCIe card,

and so on) (service provider only).

2. Replace the system board (service provider only).

0284: TCG-compliant functionality-related error (might be

the BIOS code validation failure) Replace the system board (service provider only).

0285: TCG-compliant functionality-related error (might be

the TPM initialization failure) Replace the system board (service provider only).

0286: Integrated graphics error Replace the system board (service provider only).

38 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Error codes Solutions

0287: Discrete graphics error 1. Reinstall or replace the discrete graphics card

(service provider only).

2. Replace the system board (service provider only).

0288: Computer display error 1. Reconnect the display cable on both the system

board side and the computer display side (service

provider only).

2. Replace the system board (service provider only).

No-beep symptoms

Table 4. No-beep symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator on, LCD blank, and no

POST.

1. Run LCD Self Test.

2. Ensure that every connector is connected tightly and

correctly.

3. Reseat memory module.

4. Replace the system board.

No beep, power-on indicator on, and LCD blank during

POST. 1. Run LCD Self Test.

2. Reseat memory module.

3. Replace the system board.

The power-on password prompt appears. A power-on password or a supervisor password is set.

Type the password and press Enter.

The hard disk password prompt appears. A hard disk password is set. Type the password and

press Enter.

LCD-related symptoms

Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The

presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT

LCD technology, but excessive pixel problems can cause viewing concerns.If the LCD you are servicing has

two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more

visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.

Notes:

• This policy applies to all ThinkPad notebook computers purchased on 1 January, 2008 or later.

• Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot

guarantee that any replacement LCD will have zero pixel defects.

• One pixel consists of R, G, B sub-pixels.

LCD Self Test

When you turn on the computer and the LCD goes black, run LCD Self Test to help you determine whether

the LCD functions normally.

To run LCD Self Test:

1. Ensure that the computer is connected to ac power. Then, press the power button for about seven

seconds to turn off the computer.

Chapter 4.Related service information 39

2. Press Fn, left Ctrl, and the power button at the same time. If the computer displays five solid colors in

sequence across the entire screen, it indicates that the LCD functions normally.

3. The test lasts for about 20 seconds and then exits automatically. You also can press the power button to

exit the test.

Table 5. LCD-related symptoms

Symptom or error FRU or action, in sequence

No beep, power-on indicator on, and a blank LCD during

POST.

1. Run LCD Self Test.

2. Replace the system board.

• LCD backlight not working.

• LCD too dark.

• LCD brightness cannot be adjusted.

• LCD contrast cannot be adjusted.

1. Reseat the LCD cable.

2. Replace the LCD unit.

3. Replace the system board.

• LCD screen unreadable.

• Characters missing pixels.

• Screen abnormal.

• Wrong color displayed.

1. See important note for “LCD-related symptoms.”

2. Reseat all LCD cable.

3. Replace the LCD unit.

4. Replace the system board.

Horizontal or vertical lines displayed on LCD. Replace the LCD unit.

Intermittent problems

Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware

defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be

considered only when a problem recurs.

When analyzing an intermittent problem, do the following:

1. Run the diagnostic test for the system board in loop mode at least 10 times.

2. If no error is detected, do not replace any FRUs.

3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more

errors exist.

Undetermined problems

If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed, or if

the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs

that have no defects).

Verify that all attached devices are supported by the computer.

Verify that the power supply being used at the time of the failure is operating correctly. See “Power system

checkout” on page 28.

1. Turn off the computer.

2. Visually check each FRU for damage. Replace any damaged FRU.

3. Remove or disconnect all of the following devices:

a. Non-ThinkPad devices

b. Devices attached to the docking station or the port replicator

c. Printer, mouse, and other external devices

d. Battery pack

e. Hard disk drive or solid-state drive

f. External diskette drive or optical drive

g. Memory module

h. PC cards

40 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

4. Turn on the computer.

5. Determine whether the problem has been solved.

6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.

7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):

a. System board

b. LCD unit

Chapter 4.Related service information 41

42 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 5. Use the keyboard shortcuts

The special keys on the keyboard help you work more easily and effectively.

L14 Gen 2

L15 Gen 2

1. Numeric keypad Input numbers quickly when the Numeric Lock indicator is on (for L15 Gen 2 only).

2. Windows logo key

Open the Start menu.

For information about using this key with other keys, see the Windows help

information.

3. Caps Lock key

Switch the letter case between the upper case and lower case.

When the key indicator is on, you can type uppercase letters.

4. F1–F12 function keys

Invoke the special function printed as an icon on each key or standard function.

To choose whether to invoke the special function or standard function:

1. Go to Control Panel and view by Large icons or Small icons.

2. Click Keyboard or Lenovo - Keyboard Manager and select the option of your

preference.

Switch the function of the F1–F12 keys between the standard function and special

function printed as an icon on each key.

When the Fn Lock indicator is on:

• Press F1-F12 to use the standard function.

• Press Fn+F1-F12 to use the special function.

When the Fn Lock indicator is off:

• Press Fn+F1-F12 to use the standard function.

• Press F1-F12 to use the special function.

Mute or unmute the speakers.

When the key indicator is on, the speakers are muted.

If you mute the speakers and turn off your computer, the speakers remain muted

when you turn on your computer.

Volume down.

Volume up.

Mute or unmute the microphones.

When the key indicator is on, the microphones are muted.

Brightness down.

Brightness up.

Manage external displays.

Wireless on / off.

Open or collapse the notification center.

Answer incoming calls on Microsoft Teams.

Decline incoming calls on Microsoft Teams.

Invoke the function defined by yourself.

Open Lenovo Vantage and you can define different functions for the F12 key.

Open the calculator (for L15 Gen 2 only).

Put your computer to sleep mode (for L15 Gen 2 only).

44 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Open the Snipping Tool program.

Fn+Spacebar Switch between different keyboard backlight statuses if your computer supports

keyboard backlight.

Fn+B Equal the Break key on a conventional external keyboard.

Fn+K Equal the ScrLK or Scroll Lock key on a conventional external keyboard.

Fn+P Equal the Pause key on a conventional external keyboard.

Fn+S Equal the SysRq key on a conventional external keyboard.

Fn+4 Put the computer to sleep mode. To wake up the computer, press Fn or the power

button.

Fn+Left arrow key Equal the Home key.

Fn+Right arrow key Equal the End key.

Chapter 5.Use the keyboard shortcuts 45

46 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 6. Locations

This chapter introduces the locations of the hardware components on your computer.

Locating computer controls, connectors, and indicators

Front view

L14 Gen 2

L15 Gen 2

Infrared (IR) camera* / Camera* Webcam privacy shutter*

Microphone Touch screen*

TrackPoint® pointing stick Fingerprint reader*

TrackPoint buttons Power button

Near field communication (NFC) label* Trackpad

* for selected models

Webcam privacy shutter

Slide the webcam privacy shutter to cover or uncover the camera lens. It is designed to protect your privacy.

48 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Side view

Intel models

USB-C® (Thunderbolt™ 4) power

connector USB-C (Thunderbolt 4) connector

USB 3.2 connector Gen 1 HDMI™ connector

Nano-SIM-card tray* microSD-card slot

Audio connector Always On USB 3.2 connector Gen 1

Smart-card slot* Security-lock slot

Ethernet connector

* for selected models

Chapter 6.Locations 49

AMD models

USB-C (3.2 Gen 2) power connector USB-C (3.2 Gen 2) connector

USB 3.2 connector Gen 1 HDMI connector

Nano-SIM-card tray* microSD-card slot

Audio connector Always On USB 3.2 connector Gen 1

Smart-card slot* Security-lock slot

Ethernet connector

* for selected models

50 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Bottom view

L14 Gen 2

L15 Gen 2

Speaker

Locating FRUs and CRUs

This topic introduces the following service parts:

• “Major FRUs and CRUs (for L14 Gen 2)” on page 53

• “LCD FRUs” on page 59

• “Miscellaneous parts” on page 60

Chapter 6.Locations 51

Notes:

• 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.

• Each FRU is available for all types or models, unless otherwise specified.

• CRU statement for customers:

You can resolve some problems with your product with a replacement part you can install yourself, called a

“Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others are

designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-service

CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to

the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU

information and replacement instructions are shipped with your product and are available from Lenovo at any time

upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic

version of this manual can be found at https://support.lenovo.com. Click Documentation and then follow the on-

screen instructions to find the manual for your product. You might be required to return the defective part that is

replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will

be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not

receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited

Warranty documentation for full details.

ThinkPad computers contain the following types of CRUs:

– 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.

52 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Major FRUs and CRUs (for L14 Gen 2)

Table 6. Major FRUs and CRUs

No. FRU description Self-service CRU Optional-service CRU

1LCD unit No No

2Keyboard No Yes

3Power button card with cable No No

4Memory module No Yes

Chapter 6.Locations 53

Table 6. Major FRUs and CRUs (continued)

No. FRU description Self-service CRU Optional-service CRU

5WLAN card No No

6WWAN card* or short M.2 solid-state drive* No Yes

7Thermal fan assembly (for Intel models) No No

8Heatsink (for AMD models) No No

9Thermal fan (for AMD models) No No

10 System board (for models without hard disk drive) No No

11 USB and audio card No Yes

12 Long M.2 solid-state drive* No Yes

13 Thermal pad* No No

14 Speaker assembly No No

15 Base cover assembly No Yes

16 Smart card reader bracket* No No

17 Smart card reader cable* No No

18 Smart card reader* No No

19 Dummy smart card reader* No No

20 Built-in battery No No

21 NFC antenna* No No

22 NFC module* No No

23 NFC cable* No No

24 Hard disk drive assembly* No Yes

25 Hard disk drive cable* No Yes

26 Coin-cell battery No No

27 System board (for models with hard disk drive) No No

28 Fingerprint reader cable* No No

29 Fingerprint reader module* No No

30 Fingerprint reader bracket* No No

31 Nano-SIM-card tray* Yes No

32 I/O bracket No No

33 Keyboard bezel assembly No No

34 Trackpad No No

35 Trackpad cable No No

aPower cord Yes No

bac power adapter Yes No

cMiscellaneous parts kits ( “Miscellaneous parts” on page

60)

No No

54 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Table 6. Major FRUs and CRUs (continued)

No. FRU description Self-service CRU Optional-service CRU

dLabel kit No No

eLenovo factory recovery USB key* No No

* for selected models

Note: The Lenovo factory recovery USB key e is used to restore the Microsoft Windows operating system.

It might not come with the computer, and a user might order it from https://pcsupport.lenovo.com/

lenovorecovery, though additional shipping and handling fees might apply.

Chapter 6.Locations 55

Major FRUs and CRUs (for L15 Gen 2)

Table 7. Major FRUs and CRUs

No. FRU description Self-service CRU Optional-service CRU

1LCD unit No No

2Keyboard No Yes

3Power button card with cable No No

4USB and audio card bracket No No

56 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Table 7. Major FRUs and CRUs (continued)

No. FRU description Self-service CRU Optional-service CRU

5Memory module No Yes

6WLAN card No No

7WWAN card* or short M.2 solid-state drive* No Yes

8Thermal fan assembly (for Intel models) No No

9Heatsink (for AMD models) No No

10 Thermal fan (for AMD models) No No

11 System board (for models without hard disk drive) No No

12 USB and audio card No Yes

13 Long M.2 solid-state drive* No Yes

14 Thermal pad* No No

15 Speaker assembly No No

16 Base cover assembly No Yes

17 Smart card reader bracket* No No

18 Smart card reader cable* No No

19 Smart card reader* No No

20 Dummy smart card reader* No No

21 Built-in battery No No

22 NFC antenna* No No

23 NFC module* No No

24 NFC cable* No No

25 Hard disk drive assembly* No Yes

26 Hard disk drive cable* No Yes

27 Coin-cell battery No No

28 System board (for models with hard disk drive) No No

29 Fingerprint reader cable* No No

30 Fingerprint reader module* No No

31 Fingerprint reader bracket* No No

32 Nano-SIM-card tray* Yes No

33 I/O bracket No No

34 Keyboard bezel assembly No No

35 Trackpad No No

36 Trackpad cable No No

aPower cord Yes No

bac power adapter Yes No

Chapter 6.Locations 57

Table 7. Major FRUs and CRUs (continued)

No. FRU description Self-service CRU Optional-service CRU

cMiscellaneous parts kits ( “Miscellaneous parts” on page

60)

No No

dLabel kit No No

eLenovo factory recovery USB key* No No

* for selected models

Note: The Lenovo factory recovery USB key e is used to restore the Microsoft Windows operating system.

It might not come with the computer, and a user might order it from https://pcsupport.lenovo.com/

lenovorecovery, though additional shipping and handling fees might apply.

58 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

LCD FRUs

Table 8. LCD FRUs

No. FRU descriptions Self-service

CRU

Optional-service

CRU

1LCD bezel assembly (for L15 Gen 2) No No

2LCD bezel (for L14 Gen 2) No No

3LCD panel No No

4Microphone rubbers No No

5Microphone board* No No

Chapter 6.Locations 59

Table 8. LCD FRUs (continued)

No. FRU descriptions Self-service

CRU

Optional-service

CRU

6Infrared camera/microphone module* No No

7Conventional camera/microphone module* No No

8Antenna kit No No

9Conventional camera/microphone module cable assembly* No No

10 Long hinges* No No

11 LCD rear-cover assembly No No

12 LCD strip cover (for selected L14 Gen 2 models) No No

13 Short hinges (for selected L14 Gen 2 models) No No

14 LCD elastic adhesive tapes No No

15 Infrared camera/microphone module cable assembly* No No

* for selected models

Miscellaneous parts

Table 9. Miscellaneous part

FRU descriptions Self-service

CRU

Optional-service

CRU

Screw kit for L14 Gen 2:

• Screw M2 x L2.5, black (2)

• Screw M2 x L3, silver (18)

• Screw M2 x L5, black (3)

• Screw M2.5 x L2.5, black (12)

• Screw M2.5 x L4.5, silver (6)

• Screw M2 x L2.4+2.2, black (4)

• Screw M2 x L2.3, silver (4)

• Spec

Screw kit for L15 Gen 2:

• Screw M2 x L3, silver (21)

• Screw M2 x L2.5, black (1)

• Screw M2 x L5, black (3)

• Screw M2 x L2.3, silver (4)

• Screw M2 x L2.4+2.2, black (4)

• Screw M2.5 x L2.5, black (6)

• Screw M2.5 x L4.5, silver (6)

• Spec

No No

Label Kit No No

60 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Connector and cable guide

This section provides information to help Lenovo authorized service technicians identify connectors and

cables for replacement purpose. To view each FRU and the exploded illustration of the computer, see “Major

FRUs and CRUs (for L14 Gen 2)” on page 53, “Major FRUs and CRUs (for L15 Gen 2)” on page 56 and “LCD

FRUs” on page 59.

Note: Depending on the model, some connectors or cables might not be available.

System board connectors and cables (for models with hard disk drive)

Table 10. System board

No. Connector/feature Internal cable required Cable connection

1LCD connector (internal) LCD/camera cable Connect one end to the LCD

panel, one end to the camera/

microphone combo card, and

another end to this connector.

2Power button card connector

(internal)

Power button card cable The power button card comes with

cable. Connect the cable to this

connector.

3WLAN-card slot (internal) No Insert the WLAN card into this slot.

4WWAN-card slot (internal) No Insert the WWAN card into this

slot.

5USB-C connector (external) No Connect USB-C compatible

devices to this connector.

6USB-C connector (external) No Connect USB-C compatible

devices to this connector.

7Docking-station connector

(external)

No Connect a supported docking

station to your computer through

this connector.

Chapter 6.Locations 61

Table 10. System board (continued)

No. Connector/feature Internal cable required Cable connection

8Always On USB 3.2 connector

Gen 1 (external)

No Connect USB-A compatible

devices to this connector.

9HDMI connector (external) No Connect HDMI compatible devices

to this connector.

10 Coin-cell battery connector

(internal)

No The coin-cell battery comes with a

cable. Connect the cable to this

connector.

11 MicroSD-card slot (external) No Insert a MicroSD card into this

slot.

12 Ethernet connector (external) No Connect the Ethernet cable to this

connector.

13 Smart card reader connector

(internal)

Smart card reader cable Connect one end to the smart card

reader and the other end to this

connector.

14 NFC connector (internal) NFC cable Connect one end to the NFC

module and the other end to this

connector.

15 Memory module connectors

(internal)

No Connect memory modules to

these connectors.

16 Built-in battery connector (internal) No Connect the built-in battery to this

connector.

17 Trackpad connector (internal) Trackpad cable Connect one end to the trackpad

and the other end to this

connector.

18 Fingerprint reader connector

(internal)

Fingerprint reader cable Connect one end to the fingerprint

reader module and the other end

to this connector.

19 Speaker assembly connector

(internal)

No The speaker assembly comes with

cable. Connect the cable to this

connector.

20 HDD cable connector (internal) HDD cable Connect the HDD cable to this

connector.

21 USB and audio card connector

(internal)

No Connect the USB and audio card

directly to this connector.

22 Thermal fan connector (internal) Thermal fan assembly cable The thermal fan assembly comes

with the cable. Connect the cable

to this connector.

23 Nano-SIM-card slot (external) No Insert a nano-SIM card into the

nano-SIM-card tray. Then, insert

the tray with the card into this slot.

24 Keyboard connector (internal) Keyboard assembly cable The keyboard assembly comes

with the cable. Connect the cable

to this connector.

25 TrackPoint pointing stick

connector (internal)

TrackPoint pointing stick cable The TrackPoint pointing stick

comes with the cable. Connect the

cable to this connector.

62 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

System board connectors and cables (for models without hard disk drive)

Table 11. System board

No. Connector/feature Internal cable required Cable connection

1LCD connector (internal) LCD/camera cable Connect one end to the LCD

panel, one end to the camera/

microphone combo card, and

another end to this connector.

2Power button card connector

(internal)

Power button card cable The power button card comes

with cable. Connect the cable to

this connector.

3WLAN-card slot (internal) No Insert the WLAN card into this slot.

4WWAN-card slot (internal) No Insert the WWAN card into this

slot.

5USB-C connector (external) No Connect USB-C compatible

devices to this connector.

6USB-C connector (external) No Connect USB-C compatible

devices to this connector.

7Docking-station connector

(external)

No Connect a supported docking

station to your computer through

this connector.

8Always On USB 3.2 connector Gen

1 (external)

No Connect USB-A compatible

devices to this connector.

9HDMI connector (external) No Connect HDMI compatible

devices to this connector.

10 Coin-cell battery connector

(internal)

No The coin-cell battery comes with a

cable. Connect the cable to this

connector.

Chapter 6.Locations 63

Table 11. System board (continued)

No. Connector/feature Internal cable required Cable connection

11 MicroSD-card slot (external) No Insert a MicroSD card into this

slot.

12 Ethernet connector (external) No Connect the Ethernet cable to this

connector.

13 Smart card reader connector

(internal)

Smart card reader cable Connect one end to the smart

card reader and the other end to

this connector.

14 NFC connector (internal) NFC cable Connect one end to the NFC

module and the other end to this

connector.

15 Memory module connectors

(internal)

No Connect memory modules to

these connectors.

16 Built-in battery connector (internal) No Connect the built-in battery to this

connector.

17 Trackpad connector (internal) Trackpad cable Connect one end to the trackpad

and the other end to this

connector.

18 Fingerprint reader connector

(internal)

Fingerprint reader cable Connect one end to the fingerprint

reader module and the other end

to this connector.

19 Speaker assembly connector

(internal)

No The speaker assembly comes with

cable. Connect the cable to this

connector.

20 Solid-state drive slot (internal) No Insert the solid-state drive into this

slot.

21 USB and audio card connector

(internal)

No Connect the USB and audio card

directly to this connector.

22 Thermal fan connector (internal) Thermal fan assembly cable The thermal fan assembly comes

with the cable. Connect the cable

to this connector.

23 Nano-SIM-card slot (external) No Insert a nano-SIM card into the

nano-SIM-card tray. Then, insert

the tray with the card into this slot.

24 Keyboard connector (internal) Keyboard assembly cable The keyboard assembly comes

with the cable. Connect the cable

to this connector.

25 TrackPoint pointing stick

connector (internal)

TrackPoint pointing stick cable The TrackPoint pointing stick

comes with the cable. Connect the

cable to this connector.

64 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

USB and audio card connectors (for L14 Gen 2)

Table 12. USB and audio card

No. Connector/feature Internal cable required Cable connection

1Audio connector (external) No Connect headphones or a headset

with a 3.5-mm (0.14-inch) 4-pole

plug to the audio connector.

2USB 3.2 connector Gen 1

(external)

No Insert USB-A compatible devices

into the USB connector.

3USB and audio card connector

(internal)

No Connect the USB and audio card

to the system board directly.

USB and audio card connectors (for L15 Gen 2)

Table 13. USB and audio card

No. Connector/feature Internal cable required Cable connection

1USB and audio card connector

(internal)

No Connect the USB and audio card

to the system board directly.

2USB 3.2 connector Gen 1

(external)

No Insert USB-A compatible devices

into the USB connector.

3Audio connector (external) No Connect headphones or a headset

with a 3.5-mm (0.14-inch) 4-pole

plug to the audio connector.

Chapter 6.Locations 65

Looking up FRU information

For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to:

https://support.lenovo.com/partslookup

66 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 7. FRU replacement notices

This chapter presents notices related to removing and replacing parts. Read this chapter carefully before

replacing any FRU.

CRU statement for customers:

You can resolve some problems with your product with a replacement part you can install yourself, called a

“Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others are

designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-

service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the

CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship

the CRU to you. CRU information and replacement instructions are shipped with your product and are

available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware

Maintenance Manual. An electronic version of this manual can be found at https://support.lenovo.com. Click

Documentation and then follow the on-screen instructions to find the manual for your product. You might be

required to return the defective part that is replaced by the CRU. When return is required: (1) return

instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you

might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30)

days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full

details.

Service tool kit

Ensure that the following service tool kit is prepared before you service a ThinkPad notebook computer.

No. Tool name Tool type

1 Phillips-head screwdriver Common tool

2 Torx-head screwdriver Common tool

3Conductive tweezers Common tool

4 Hexagonal socket Common tool

5Silicone grease Consumable tool

6 Polyamide tape Consumable tool

7 Mylar 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 heatsink to eliminate air

gaps. The hexagonal socket is used to pick up the antenna connectors.

Screw notices

Loose screws can cause a reliability problem. In the ThinkPad notebook computer, this problem is

addressed with special nylon-coated screws that have the following characteristics:

• They maintain tight connections.

• They do not easily come loose, even with shock or vibration.

• They are harder to tighten.

Do the following when you service this machine:

• Keep the screw kit in your tool bag. For the part number of the screw kit, go to https://support.lenovo.com/

partslookup.

• It is recommended to use new screws.

• It is recommended to use each screw only once.

Tighten screws as follows:

• Plastic to plastic

Turn an additional 90 degrees after the screw head touches the surface of the plastic part.

• Logic card to plastic

Turn an additional 180 degrees after the screw head touches the surface of the logic card.

Notes:

• Ensure that you use the correct screw. It is recommended to use new screws for replacements. If you

have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table

for each step.

• Ensure that torque screwdrivers are calibrated correctly following country specifications.

Retaining serial numbers

This topic provides instructions on the following:

• “Restoring the serial number of the system unit” on page 68

• “Retaining the UUID” on page 69

Restoring the serial number of the system unit

When the computer was manufactured, the EEPROM on the system board was loaded with the serial

numbers of the system and all major components. These numbers need to remain the same throughout the

life of the computer.

If you replace the system board, you must restore the serial number of the system unit to its original value.

68 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

The serial number of the system unit is written on the label attached to the bottom of the computer.

If you cannot find the serial number of the system unit on the bottom of the computer, try the following

method to get the number:

1. Connect a USB memory key to the computer.

2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a

Maintenance Key.

Note: Only an authorized Lenovo service technician can access the above Web site.

3. Restart the computer.

4. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is

displayed.

5. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for

Asset ID screen is displayed.

6. Type 2 under Enter the action desired, then press Enter. The serial number of each device in your

computer is displayed; the serial number of the system unit is listed as follows:

20- Serial number

7. Record the serial number of the system unit.

After you replace the system board, do the following to restore the serial number of the system unit:

1. Connect the Maintenance Key to the computer.

2. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is

displayed.

3. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for

Asset ID screen is displayed.

4. Type 1 under Enter the action desired, then press Enter. Then follow the instructions on the screen to

restore the serial number of the system unit.

Retaining the UUID

The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at

production and stored in the EEPROM of your system board.

The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two

computers in the world have the same number.

When you replace the system board, perform the following steps to create a new UUID for the system board

if the system board does not have a UUID:

1. Connect a USB memory key to the computer.

2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a

Maintenance Key.

Note: Only an authorized Lenovo service technician can access the above Web site.

3. Restart the computer.

4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface

is displayed.

5. Type 2 under Enter the action desired, then press Enter. The Auto UUID generation utility interface is

displayed.

6. Type y under Change UUID. OK? [Y/N], then press Enter. A new UUID is created and written. If a valid

UUID already exists, it is not overwritten.

Chapter 7.FRU replacement notices 69

Reading or writing the ECA information

Information about Engineering Change Announcements (ECA) is stored in the EEPROM of the system board.

The electronic storage of this information simplifies the procedure to check if the ECA has been previously

applied to a machine. The machine does not need to be disassembled to check for the ECA application.

To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write

function on the LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key.

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and

then restart the computer.

2. From the main menu, select 6. Set ECA Information.

3. To read the ECA information, select 2. Read ECA/rework number from EEPROM and follow the

instructions on the screen; To read box build date, select 5. Read box build date from EEPROM, and

follow the instructions on the screen.

After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's

application. Use the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance

Key to update the EEPROM.

Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed to be the

same as the machine type of the machine that had the ECA applied to it.

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and

then restart the computer.

2. From the main menu, select 6. Set ECA Information.

3. To write the ECA information, select 1. Write ECA/rework number from EEPROM, and follow the

instruction; To write box build date, select 4. Write box build date from EEPROM, and follow the

instruction on the screen.

If the system board is being replaced, try to read the ECA information from the old system board and transfer

the information to the new system. If the system board is inoperable, this will not be possible.

70 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Chapter 8. Removing or replacing a FRU

This chapter provides instructions on how to remove or replace a FRU.

CRU statement for customers:

You can resolve some problems with your product with a replacement part you can install yourself, called a

“Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others are

designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-

service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the

CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship

the CRU to you. CRU information and replacement instructions are shipped with your product and are

available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware

Maintenance Manual. An electronic version of this manual is available for downloading at https://

support.lenovo.com. You might be required to return the defective CRU. When return is required: (1) return

instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you

might be charged for the replacement CRU if Lenovo does not receive the defective part within thirty (30)

days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full

details.

General guidelines

When removing or replacing a FRU, be sure to observe the following general guidelines:

1. Do not try to service any computer unless you have been trained and certified. An untrained person runs

the risk of damaging parts.

2. Before replacing any FRU, review Chapter 7 “FRU replacement notices” on page 67.

3. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs

are listed at the beginning of each FRU replacement section. Remove them in the order in which they are

listed.

4. Follow the correct sequence in the steps for removing a FRU, as given in the illustrations by the numbers

in square callouts.

5. When turning a screw, turn it in the direction as given by the arrow in the illustration.

6. When removing a FRU, move it in the direction as given by the arrow in the illustration.

7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to

replacement.

8. When replacing a FRU, use the correct screws as shown in the replacement procedures.

DANGER

Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, and

then disconnect any interconnecting cables.

Attention:

• After replacing a FRU, do not turn on the computer until you have made sure that all screws, springs, and

other small parts are in place and none are loose inside the computer. Verify this by shaking the computer

gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits.

• The system board is sensitive to, and can be damaged by, electrostatic discharge (ESD). Before touching

it, establish personal grounding by touching a ground point with one hand or by using an electrostatic

discharge strap.

Before servicing the computer

Carefully read this topic before servicing the computer.

Disabling the built-in battery

Before replacing any FRU, ensure that you disable Fast Startup first and then disable the built-in battery.

To disable Fast Startup, do the following:

1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small

icons.

2. Click Power Options, and then click Choose what the power buttons do on the left pane.

3. Click Change settings that are currently unavailable at the top.

4. If prompted by User Account Control (UAC), click Yes.

5. Clear the Turn on fast startup check box, and then click Save changes.

To disable the built-in battery, do the following:

1. Restart your computer. When the logo screen is displayed, immediately press F1 to enter ThinkPad

Setup.

2. Select Config ➙ Power. The Power submenu is displayed.

3. Select Disable built-in battery and press Enter.

4. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off

automatically. Wait three to five minutes to let the computer cool.

Removing the nano-SIM card and nano-SIM-card tray

Some models you are servicing might have a nano-SIM card installed. If the computer you are servicing has

a nano-SIM card installed, remove the nano-SIM card and the nano-SIM-card tray before you start the

servicing.

SIM

HDMI

SIM

HDMI

After you finish the servicing, ensure that you install the card and the tray back into the slot firmly.

Removing the microSD card

Some models you are servicing might have a microSD card installed. If the computer you are servicing has a

microSD card installed, remove the microSD card before you start the servicing.

72 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

SIM

HDMI

SIM

HDMI

SIM

HDMI

After you finish the servicing, ensure that you install the card back into the slot firmly.

1010 Keyboard

Note: You might be instructed to slide the keyboard frame forward or backward in some of the following

steps. In this case, ensure that you do not press or hold the keys while sliding the keyboard frame.

Otherwise, the keyboard frame cannot be moved.

Removal steps of the keyboard

Chapter 8.Removing or replacing a FRU 73

When installing:

Ensure that the connector is attached firmly.

1020 Base cover assembly

Note: Depending on the computer model, your computer might look different from the illustrations in this

topic.

74 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the base cover assembly

Applying labels to the base cover assembly

The following illustration shows the label locations on the base cover assembly.

1 Geo label 5 Genuine Microsoft label (for Windows 10)

2 IMEI label 6 S/N label

3 Country label 7 Asset tag label

4 COA label

Chapter 8.Removing or replacing a FRU 75

1030 Wireless-LAN card

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Removal steps of the Wireless-LAN card

Step Screw (quantity) Color Torque

2M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Plug the gray cable into the connector labeled Main on the card, and plug the black cable into the connector

labeled Aux on the card.

1040 Wireless-WAN card (for selected models)

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

76 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the wireless-WAN card

Step Screw (quantity) Color Torque

2M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Plug the orange cable into the connector labeled MAIN on the card, and plug the blue cable into the

connector labeled AUX on the card.

1050 Memory module

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Chapter 8.Removing or replacing a FRU 77

Removal steps of the memory module

When installing:

Insert the notched end of the memory module into the memory slot. Press the memory module in firmly, and

pivot it downward until it snaps into place. Ensure that the memory module is firmly installed in the slot and

does not move easily.

Note: If you install only one memory module, ensure your install it in the memory slot next to the thermal fan

assembly.

1060 I/O bracket

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

Removal steps of the I/O bracket

78 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1M2.5 × 4.5 mm, flat-head, nylon-coated (1) Silver 0.294 Nm

(3.0 kgf-cm)

2M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

3M2 × 2.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

When installing:

Ensure that the I/O bracket is attached firmly.

1070 Storage drive

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Removal steps of the hard disk drive assembly and hard disk drive cable

Attention:

• Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper

handling can cause damage and permanent loss of data.

• Before removing the drive, have the user make a backup copy of all the information on it if possible.

• Never remove the drive while the system is operating or in suspend mode.

Chapter 8.Removing or replacing a FRU 79

Removal steps of the short M.2 solid-state drive

Attention:

• If your computer is installed with a hybrid solid-state drive (with Intel Optane memory), go to https://

support.lenovo.com/docs/tg_ssd to know the details on how to replace it.

• The M.2 solid-state drive is sensitive. Inappropriate handling might cause damage and permanent loss of

data.

When handling the M.2 solid-state drive, observe the following guidelines:

• Replace the M.2 solid-state drive only for upgrade or repair. The M.2 solid-state drive is not designed for

frequent changes or replacement.

• Before replacing the M.2 solid-state drive, make a backup copy of all the data that you want to keep.

• Do not apply pressure to the M.2 solid-state drive.

• Do not touch the contact edge or circuit board of the M.2 solid-state drive. Otherwise, the M.2 solid-state

drive might get damaged.

• Do not make the M.2 solid-state drive subject to physical shocks or vibration. Put the M.2 solid-state drive

on a soft material, such as cloth, to absorb physical shocks.

80 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

Removal steps of the long M.2 solid-state drive

Step Screw (quantity) Color Torque

1M2 × 2.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

1080 USB and audio card bracket (for L15 Gen 2)

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Chapter 8.Removing or replacing a FRU 81

Removal steps of the USB and audio card bracket

Step Screw (quantity) Color Torque

1M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

2M2.5 × 4.5 mm, flat-head, nylon-coated (2) Silver 0.294 Nm

(3.0 kgf-cm)

1090 USB and audio card

For access, remove these FRUs:

• “1020 Base cover assembly” on page 74

• “1080 USB and audio card bracket (for L15 Gen 2)” on page 81

Removal steps of the USB and audio card (for L14 Gen 2)

Step Screw (quantity) Color Torque

1M2 × 3 mm, flat-head, nylon-coated (3) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Ensure that the connector is attached firmly.

82 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the USB and audio card (for L15 Gen 2)

Step Screw (quantity) Color Torque

1M2 × 3 mm, flat-head, nylon-coated (2) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Ensure that the connector is attached firmly.

1100 Speaker assembly

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1120 Built-in battery” on page 86

Removal steps of the speaker assembly

Chapter 8.Removing or replacing a FRU 83

Step Screw (quantity) Color Torque

4M2 × 2.4+2.2 mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

1110 Thermal fan assembly

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Removal steps of the thermal fan assembly (for Intel models)

84 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the thermal fan assembly (for AMD models)

When installing:

• Ensure that the connector of the thermal fan is attached firmly.

• Before you attach the thermal fan assembly to the computer, apply thermal grease, at an amount of 0.2

grams, on the parts marked a as shown in the following illustrations. Either too much or too less

application of grease can cause a thermal problem due to imperfect contact with a component. For the

new thermal fan assembly, you must peel the thin film off from the rubbers.

For models with discrete thermal pipes:

Chapter 8.Removing or replacing a FRU 85

For models with an integrated thermal pipe:

1120 Built-in battery

For access, remove this FRU:

• “1020 Base cover assembly” on page 74

Important notices for replacing a battery

Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and

provides no warranties for failures or damage arising out of their use.

DANGER

Use only the authorized battery specified for your computer. Any other battery could ignite or

explode.

Note: Depending on the computer model, your computer might look different from the following illustration.

Removal steps of the built-in battery

Step Screw (quantity) Color Torque

2M2 × 5 mm, flat-head, nylon-coated (3) Black 0.181 Nm

(1.85 kgf-cm)

1130 Coin-cell battery

For access, remove these FRUs in order:

86 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

• “1020 Base cover assembly” on page 74

• “1120 Built-in battery” on page 86

DANGER

Use only the authorized battery specified for your computer. Any other battery could ignite or

explode.

Removal steps of the coin-cell battery

When installing:

Ensure that the connector is attached firmly.

1140 NFC cable, NFC module and NFC antenna

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1120 Built-in battery” on page 86

Removal steps of the NFC cable, NFC module and NFC antenna (L14 Gen 2)

Chapter 8.Removing or replacing a FRU 87

When installing:

Ensure that the connector is attached firmly.

88 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the NFC cable, NFC module and NFC antenna (L15 Gen 2)

When installing:

Ensure that the connector is attached firmly.

1150 Trackpad cable and Trackpad

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1120 Built-in battery” on page 86

Chapter 8.Removing or replacing a FRU 89

Removal steps of the Trackpad cable and Trackpad

90 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

7M2 × 2.3 mm, flat-head, nylon-coated (4) Silver 0.181 Nm

(1.85 kgf-cm)

1160 Fingerprint reader cable, bracket and module

Removal steps of the fingerprint reader cable, bracket and module (for models with hard disk drive)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1070 Storage drive” on page 79

• “1120 Built-in battery” on page 86

Chapter 8.Removing or replacing a FRU 91

92 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the fingerprint reader cable, bracket and module (for models without hard disk

drive)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1070 Storage drive” on page 79

• “1120 Built-in battery” on page 86

Chapter 8.Removing or replacing a FRU 93

1170 Power button card with cable

Removal steps of the power button card with cable (for L14 Gen 2)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1110 Thermal fan assembly” on page 84

Step Screw (quantity) Color Torque

3M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

94 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

When installing:

Ensure that the connector is attached firmly.

Removal steps of the power button card and cable (for L15 Gen 2)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1080 USB and audio card bracket (for L15 Gen 2)” on page 81

• “1110 Thermal fan assembly” on page 84

Step Screw (quantity) Color Torque

3M2 × 3 mm, flat-head, nylon-coated (1) Silver 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 95

When installing:

Ensure that the connector is attached firmly.

1180 Smart card reader,cable and bracket

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1100 Speaker assembly” on page 83

• “1120 Built-in battery” on page 86

Removal steps of the smart card reader,cable and bracket (for L14 Gen 2)

96 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

3M2 × 2.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

4M2 × 3 mm, flat-head, nylon-coated (4) Silver 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 97

Removal steps of the smart card reader,cable and bracket (for L15 Gen 2)

Step Screw (quantity) Color Torque

3M2 × 3 mm, flat-head, nylon-coated (4) Silver 0.181 Nm

(1.85 kgf-cm)

98 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

1190 System board

Important notices for handling the system board:

When handling the system board, read the following:

• The system board has an accelerometer, which can be broken when several thousands of G-forces are applied.

Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject

the accelerometer to as much as 6000 G's of shock.

• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or

composite.

• Avoid rough handling of any kind.

• At every point in the process, be sure not to drop or stack the system board.

• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated

conductive surface.

For access, remove these FRUs in order:

• “Removing the nano-SIM card and nano-SIM-card tray” on page 72

• “Removing the microSD card” on page 72

• “1010 Keyboard” on page 73

• “1020 Base cover assembly” on page 74

• “1030 Wireless-LAN card” on page 76

• “1040 Wireless-WAN card (for selected models)” on page 76

• “1050 Memory module” on page 77

• “1060 I/O bracket” on page 78

• “1070 Storage drive” on page 79

• “1080 USB and audio card bracket (for L15 Gen 2)” on page 81

Chapter 8.Removing or replacing a FRU 99

• “1090 USB and audio card” on page 82

• “1110 Thermal fan assembly” on page 84

• “1120 Built-in battery” on page 86

Attention: The components on the system board are extremely sensitive. When you service the system

board, avoid any kind of rough handling.

Removal steps of the system board (for models with hard disk drive)

Step Screw (quantity) Color Torque

16 M2.5 × 4.5 mm, flat-head, nylon-coated (2) Silver 0.294 Nm

(3.0 kgf-cm)

100 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

18 M2 × 3 mm, flat-head, nylon-coated (3) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Ensure that the connectors are attached firmly.

Chapter 8.Removing or replacing a FRU 101

Removal steps of the system board (for models without hard disk drive)

Step Screw (quantity) Color Torque

14 M2.5 × 4.5 mm, flat-head, nylon-coated (2) Silver 0.294 Nm

(3.0 kgf-cm)

102 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

16 M2 × 3 mm, flat-head, nylon-coated (6) Silver 0.181 Nm

(1.85 kgf-cm)

When installing:

Ensure that the connectors are attached firmly.

1200 LCD unit

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 74

• “1060 I/O bracket” on page 78

• “1080 USB and audio card bracket (for L15 Gen 2)” on page 81

• “1110 Thermal fan assembly” on page 84

Chapter 8.Removing or replacing a FRU 103

Removal steps of the LCD unit (for L14 Gen 2)

Step Screw (quantity) Color Torque

4M2.5 × 4.5 mm, flat-head, nylon-coated (5) Silver 0.294 Nm

(3.0 kgf-cm)

104 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the LCD unit (for L15 Gen 2)

Chapter 8.Removing or replacing a FRU 105

Step Screw (quantity) Color Torque

4M2.5 × 4.5 mm, flat-head, nylon-coated (3) Silver 0.294 Nm

(3.0 kgf-cm)

When installing:

• Ensure that the connectors are attached firmly.

106 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

• Ensure that the cables are not subject to any tension. Tension could cause the cables to be damaged by

the cable guides, or a wire to be broken.

2010 LCD bezel

For access, remove this FRU:

• “1200 LCD unit” on page 103

Removal step of the LCD bezel

Removal step of the LCD bezel (for selected L14 Gen 2 models)

When installing:

Ensure that all the latches are attached firmly.

Chapter 8.Removing or replacing a FRU 107

2020 LCD panel and LCD elastic adhesive tapes

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

Removal steps of the LCD panel (for L14 Gen 2)

1. Grasp the end of three elastic adhesive tapes with tweezers. Pull out each tape slowly in the direction as

shown until three elastic adhesive tapes are all released from LCD unit 1.

Note: Do not pull the tapes too fast, otherwise, the tapes might snap.

2. Turn over the LCD panel 2 and detach the LCD cable from the LCD panel as shown.

108 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

When installing: After the LCD elastic adhesive tapes are removed, they cannot be used anymore. New LCD

elastic adhesive tapes are required for replacement.

Removal steps of the LCD panel (for L15 Gen 1)

1. Grasp the end of three elastic adhesive tapes with tweezers. Pull out each tape slowly in the direction as

shown until three elastic adhesive tapes are all released from LCD unit 1.

Note: Do not pull the tapes too fast, otherwise, the tapes might snap.

2. Turn over the LCD panel 2 and detach the LCD cable from the LCD panel as shown.

Chapter 8.Removing or replacing a FRU 109

When installing: After the LCD elastic adhesive tapes are removed, they cannot be used anymore. New LCD

elastic adhesive tapes are required for replacement.

Installation steps of the LCD elastic adhesive tapes

1. Peel off the release liners from one side of the new elastic adhesive tapes 1.

2. Apply the tapes to the correct locations 2.

2030 Camera/microphone module

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

• “2020 LCD panel and LCD elastic adhesive tapes” on page 108

110 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Removal steps of the infrared camera/microphone module

Removal steps of the conventional camera/microphone module

When installing:

Ensure that the connector is attached firmly.

2040 Camera/LCD cable

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

• “2020 LCD panel and LCD elastic adhesive tapes” on page 108

Chapter 8.Removing or replacing a FRU 111

Removal steps of the infrared camera/LCD cable

Removal steps of the conventional camera/LCD cable

112 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

2050 Hinges

Removal steps of the long hinges

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

• “2020 LCD panel and LCD elastic adhesive tapes” on page 108

• “2040 Camera/LCD cable” on page 111

Chapter 8.Removing or replacing a FRU 113

Step Screw (quantity) Color Torque

2M2 × 3 mm, flat-head, nylon-coated (2) Silver 0.181 Nm

(1.85 kgf-cm)

3M2.5 × 2.5 mm, flat-head, nylon-coated (6) Black 0.294 Nm

(3.0 kgf-cm)

Removal steps of the short hinges

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

114 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1M2.5 × 2.5 mm, flat-head, nylon-coated (6) Black 0.294 Nm

(3.0 kgf-cm)

2060 Wireless antenna assembly

For access, remove these FRUs in order:

• “1200 LCD unit” on page 103

• “2010 LCD bezel” on page 107

• “2020 LCD panel and LCD elastic adhesive tapes” on page 108

• “2040 Camera/LCD cable” on page 111

• “2050 Hinges” on page 113

Chapter 8.Removing or replacing a FRU 115

Removal steps of the wireless antenna assembly

Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause

the cables to be damaged by the cable guides, or a wire to be broken.

116 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Antenna locations

a Wireless-LAN main antenna (gray)

b Wireless-WAN main antenna (orange)*

c Wireless-WAN auxiliary antenna (blue)*

d Wireless-LAN auxiliary antenna (black)

Chapter 8.Removing or replacing a FRU 117

118 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Appendix A. Notices

Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult

your local Lenovo representative for information about 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 applications 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.

This information could include technical inaccuracies or typographical errors. Changes are periodically made

to the information herein; these changes will be incorporated in new editions of the publication. Lenovo may

make improvements and/or changes in the product(s) and/or the program(s) described in this publication at

any time without notice.

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.

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.

Trademarks

LENOVO, LENOVO logo, THINKPAD, THINKPAD logo and TRACKPOINT are trademarks of Lenovo.

Microsoft and Windows are trademarks of the Microsoft group of companies. The terms HDMI and HDMI

High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the

United States and other countries. USB-C is a trademark of USB Implementers Forum. All other trademarks

120 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Appendix B. Abbreviation table

The following table lists all abbreviations and acronyms used in this manual.

Abbreviation Term

BGA Ball Grid Array

BIOS basic input/output system

CMOS complementary metal-oxide semiconductor

COA Certificate of Authentication

CRC cyclic redundancy check

CRT cathode ray tube

CRU customer-replaceable unit

CTO configure to order

EAIA Enhanced Asset Information Area

ECA Engineering Change Announcements

EEPROM Electrically Erasable Programmable Read-Only Memory

EFI Extensible Firmware Interface

EPO emergency power-off

ESD electrostatic discharge

EU European Union

FCC Federal Communications Commission

FRU Field Replaceable Unit

GAV General Announce Variant

GPU graphics processing unit

HDD hard disk drive

HDMI high-definition multimedia interface

ICs integrated circuits

ICCID integrate circuit card identity

ISO International Standardization Organization

LAN local area network

LCD liquid crystal display

MAC media access control

MT machine type

MTM machine type and model

PC personal computer

PCH Platform Controller Hub

POST power-on self-test

Abbreviation Term

RAM random-access memory

RF radio frequency

RFID radio-frequency identification

RI ring indicator

RJ registered jack

SATA Serial Advanced Technology Attachment

SIM subscriber identity module

SVP supervisor password

TFTs thin-film transistors

UEFI Unified Extensible Firmware Interface

USB Universal Serial Bus

UUID universally unique identifier

VGA video graphics array

VRAM video random-access memory

WAN wide area network

122 L14 Gen 2 and L15 Gen 2 Hardware Maintenance Manual

Part Number: SP40W88716_01

Printed in China

(1P) P/N: SP40W88716_01

*1PSP40W88716_01*

Table of Contents

Lenovo L14 User Manual

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