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. Special keys
Chapter 6. Locations
Chapter 7. FRU replacement notices
- Screw notices
- Retaining serial numbers
Chapter 8. Removing or replacing a FRU
Appendix A. Notices
Appendix B. Abbreviation table

Lenovo T490s User Manual

Displayed below is the user manual for T490s by Lenovo which is a product in the Notebooks category. This manual has pages.

Related Manuals

Lenovo T490s Manual

T490s and X390

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 107.

First Edition (March 2019)

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 . . . . . . . . . . . . . 3

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 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 . . . . . . . . . . . . 22

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 . . . . . . . 29

Checking the built-in battery and operational

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

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

Chapter 4. Related service

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

Recovery information for the Windows 10

operating system . . . . . . . . . . . . . . 31

Resetting your computer . . . . . . . . . . . 31

Using advanced startup options . . . . . . . . 31

Recovering your operating system if Windows 10

fails to start . . . . . . . . . . . . . . . . 32

Creating and using a recovery USB drive . . . . . 32

Passwords. . . . . . . . . . . . . . . . . 33

Power-on password . . . . . . . . . . . 33

Hard disk password . . . . . . . . . . . 33

Supervisor password . . . . . . . . . . . 33

How to remove the power-on password . . . 34

How to remove the hard disk password. . . . 34

Power management . . . . . . . . . . . . . 35

Sleep mode . . . . . . . . . . . . . . 35

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

Symptom-to-FRU index . . . . . . . . . . . 36

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

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

Beep errors. . . . . . . . . . . . . . . 38

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

LCD-related symptoms . . . . . . . . . . 40

Intermittent problems . . . . . . . . . . . 41

Undetermined problems . . . . . . . . . 41

Chapter 5. Special keys . . . . . . . . 43

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

Locating computer controls, connectors, and

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

Front . . . . . . . . . . . . . . . . . 47

Base . . . . . . . . . . . . . . . . . 48

Left . . . . . . . . . . . . . . . . . . 49

Right . . . . . . . . . . . . . . . . . 49

Rear . . . . . . . . . . . . . . . . . 50

Bottom . . . . . . . . . . . . . . . . 51

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

Major FRUs and CRUs . . . . . . . . . . 52

LCD FRUs and CRUs . . . . . . . . . . . 58

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

Connector and cable guide . . . . . . . . 60

Looking up FRU information . . . . . . . . . . 63

Chapter 7. FRU replacement

notices . . . . . . . . . . . . . . . . . 65

Screw notices . . . . . . . . . . . . . . . 65

Retaining serial numbers . . . . . . . . . . . 66

Restoring the serial number of the system

unit . . . . . . . . . . . . . . . . . . 66

Retaining the UUID. . . . . . . . . . . . 66

Reading or writing the ECA information . . . . 67

Chapter 8. Removing or replacing a

FRU. . . . . . . . . . . . . . . . . . . 69

General guidelines. . . . . . . . . . . . . . 69

Before servicing the computer . . . . . . . . . 69

Disabling the built-in battery . . . . . . . . 69

Removing the nano-SIM-card and microSD-

card tray . . . . . . . . . . . . . . . . 70

1010 Keyboard (for ThinkPad X390 only) . . . . . 70

1020 Base cover assembly . . . . . . . . . . 72

1030 M.2 solid-state drive, bracket, and thermal

pad . . . . . . . . . . . . . . . . . . . 73

1040 Wireless WAN card . . . . . . . . . . . 75

1050 Docking-station-connector bracket . . . . . 76

1060 Thermal fan assembly . . . . . . . . . . 77

1070 USB-card cable and USB card. . . . . . . 77

1080 Built-in battery . . . . . . . . . . . . . 79

1090 Coin-cell battery . . . . . . . . . . . . 81

1100 Trackpad cable. . . . . . . . . . . . . 81

1110 Trackpad . . . . . . . . . . . . . . . 82

1120 NFC card . . . . . . . . . . . . . . . 84

1130 Speaker assembly . . . . . . . . . . . 85

1140 Fingerprint-reader-and-smart-card-reader

cable, fingerprint-reader cable, and smart-card-

reader cable (for ThinkPad T490s only) . . . . . . 87

1150 Fingerprint-reader bracket and fingerprint

reader . . . . . . . . . . . . . . . . . . 88

1160 Smart card reader or dummy smart card

reader . . . . . . . . . . . . . . . . . . 89

1170 System board . . . . . . . . . . . . . 91

1180 Power-card cable and power card . . . . . 95

1190 LCD unit . . . . . . . . . . . . . . . 96

1200 Keyboard assembly (for ThinkPad T490s) or

Keyboard bezel assembly (for ThinkPad X390) . . . 98

2010 LCD bezel cover and LCD bezel . . . . . . 98

2020 LCD hinges . . . . . . . . . . . . . . 99

2030 LCD panel and LCD cable . . . . . . . . 100

2040 Camera and microphone module and

aluminum foil (for ThinkPad T490s only) . . . . . 100

2050 Camera-and-microphone-module cable and

antenna kit . . . . . . . . . . . . . . . . . 101

2060 LCD cover assembly. . . . . . . . . . . 105

Appendix A. Notices . . . . . . . . . . 107

Appendix B. Abbreviation table . . . . 109

ii T490s and X390 Hardware Maintenance Manual

About this manual

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

ThinkPad T490s Machine types (MT) 20NX and 20NY

ThinkPad X390 Machine types (MT) 20Q0 and 20Q1

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.

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.

iv T490s and X390 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 3

• “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. Ensure 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, ensure 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 tool case away from walk areas so that other people will not trip over it.

• Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves

are fastened or rolled up above your elbows. If your hair is long, fasten it.

• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8

centimeters (3 inches) from the end.

• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing, because 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 (ESD). 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. That 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.

CAUTION:

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:

– Power supply units

– Pumps

– Blowers and fans

– Motor generators

– Units similar to those 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.

2T490s and X390 Hardware Maintenance Manual

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.

Consider these conditions and the safety hazards they present:

• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal

electrical shock)

• Explosive hazards, such as a damaged CRT face or 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.

Chapter 1.Safety information 3

2. Ensure 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.

– 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

4T490s and X390 Hardware Maintenance Manual

DANGER

Chapter 1.Safety information 5

DANGER

6T490s and X390 Hardware Maintenance Manual

PERIGO

Chapter 1.Safety information 7

PERIGO

8T490s and X390 Hardware Maintenance Manual

PERIGO

DANGER

Chapter 1.Safety information 9

DANGER

10 T490s and X390 Hardware Maintenance Manual

DANGER

VORSICHT

Chapter 1.Safety information 11

VORSICHT

12 T490s and X390 Hardware Maintenance Manual

Chapter 1.Safety information 13

14 T490s and X390 Hardware Maintenance Manual

Chapter 1.Safety information 15

16 T490s and X390 Hardware Maintenance Manual

Chapter 1.Safety information 17

18 T490s and X390 Hardware Maintenance Manual

Chapter 1.Safety information 19

20 T490s and X390 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 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 22

Important:

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

obtaining or installing any software fixes, drivers, and 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 may 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 solid-state drive

Always try to run a low-level format operation before replacing a solid-state drive. This will cause all

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

perform this task.

Attention: The drive startup sequence in the computer you are servicing might have been changed. Be

extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect

drive, data or programs can be overwritten.

Important notice for replacing a system board

Some components mounted on a system board are very sensitive. Improper handling of a system board can

cause damage to those components, and may cause a system malfunction.

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 might also cause false error

codes. If no error code is displayed, see whether the error symptom is listed in the section of “Symptom-to-

FRU index” on page 36.

Strategy for replacing FRUs for CTO, special-bid, and standard models

This topic provides information about the model types and FRU identification.

Product definition

This topic introduces different model types and how to identify each type.

Dynamic Configure To Order (CTO) model

This model provides the ability for a customer to configure a Lenovo solution from a Web Site, and have this

configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and

eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.

The model is “CTO1” and the default country code is “WW” (example: 20AACTO1WW).

Special-bid model

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

MTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided

to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not

designate a specific country or region. The custom model fact sheet for the MTM indicates which country the

special bid MTM is set up for. Special-bid offering is not generally announced.

Standard model

Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the

machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country

code. The country code assigned is alphabetic and represents a designated country or region (example:

20AA0009UK).

FRU identification

To identify FRUs for a product, do the following:

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

22 T490s and X390 Hardware Maintenance Manual

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 T490s and X390 Hardware Maintenance Manual

Chapter 3. General checkout

This chapter presents 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

Some descriptions in this chapter might not apply to your particular computer.

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 to use new nylon-coated screws.

• Be extremely careful during such write operations as copying, saving, or formatting. Drives in the computer

that you are servicing sequence 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.

• 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, ESD, 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 PC Card or the installation of an incompatible card

• Diskette drive damage caused by pressure on the diskette drive cover, foreign material in the drive, or the

insertion of a diskette with multiple labels

• Damaged or bent diskette eject button

• 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 solid-state drive. If the spindle of a solid-state drive becomes noisy, the

solid-state 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

computer.

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 T490s and X390 Hardware Maintenance Manual

Quick test programs

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

does not have Lenovo Vantage 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. This program enables you to view system

information and test some hardware devices in your computer, such as memory, storage devices, the LCD,

and system board buses.

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 36

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 program.

The following table displays the main items of the UEFI diagnostic program. Depending on the model, the

items might differ slightly.

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

Tests Tools

• Memory quick test

• Memory extended test

• Memory bit fade test (180 min)

• Quick storage device test

• LCD test

• PCI-e test

• Motherboard buses test

• Exit application

• System information

• Generate configuration file

• Execute from configuration file

• Recover bad sectors tool

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 program enables

you to view system information and test some hardware devices in your computer, such as memory, storage

Chapter 3.General checkout 27

devices, the LCD, and system board buses. To use the bootable diagnostic program, you can create a

bootable diagnostic medium using a USB device or disc.

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 disc.

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 36 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 launches.

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

• If you have created the bootable diagnostic medium using a disc, 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 36 for error code descriptions and troubleshooting hints.

2. Insert the disc 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

launches.

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. Connect the ac power adapter.

3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power

adapter is functional.

4. Insert a straightened paper clip into the emergency-reset hole to reset the computer. If the computer is

still powered on, it means that the ac power adapter is functional.

5. Turn off the computer.

6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means

that the battery is functional.

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

• “Checking the ac power adapter” on page 29

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

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

28 T490s and X390 Hardware Maintenance Manual

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.

• 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.

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

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

Checking the coin-cell battery

Do the following:

1. Power off the computer, and unplug the ac power adapter from it.

2. Turn the computer upside down.

3. Remove the built-in battery (see “Disabling the built-in battery” on page 69).

4. Remove the coin-cell battery (see “1090 Coin-cell battery” on page 81).

5. Measure the voltage of the battery. See the following figure.

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 T490s and X390 Hardware Maintenance Manual

Chapter 4. Related service information

This chapter presents following information:

• “Recovery information for the Windows 10 operating system” on page 31

• “Passwords” on page 33

• “Power management” on page 35

• “Symptom-to-FRU index” on page 36

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

Recovery information for the Windows 10 operating system

The Windows recovery programs enable you to reset your computer or use advanced startup options.

It is recommended that you create a recovery USB drive as early as possible. Store the recovery USB drive

as a backup or replacement for the Windows recovery programs.

For more information, see “Creating and using a recovery USB drive” on page 32.

Resetting your computer

If your computer does not perform well, you might consider resetting your computer. In the resetting

process, you can choose to keep your files or remove them, and then reinstall the Windows operating

system.

To reset your computer, do the following:

Note: The graphical user interface (GUI) items of the operating system might change without notice.

1. Open the Start menu, and then click Settings ➙ Update & Security ➙ Recovery.

2. In the Reset this PC section, click Get started.

3. Follow the instructions on the screen to reset your computer.

Using advanced startup options

With advanced startup options, you can change the firmware settings of the computer, change the startup

settings of the Windows operating system, start the computer from an external device, or restore the

Windows operating system from a system image.

To use advanced startup options, do the following:

Note: The GUI items of the operating system might change without notice.

1. Open the Start menu, and then click Settings ➙ Update & security ➙ Recovery.

2. In the Advanced startup section, click Restart now ➙ Troubleshoot ➙ Advanced options.

3. Select a startup option you want, and then follow the instructions on the screen.

Recovering your operating system if Windows 10 fails to start

The Windows recovery environment on your computer is capable of operating independently from the

Windows 10 operating system. This enables you to recover or repair the operating system even if the

Windows 10 operating system fails to start.

After two consecutive failed boot attempts, the Windows recovery environment starts automatically. Then

you can choose repair and recovery options by following the instructions on the screen.

Note: Ensure that your computer is connected to ac power during the recovery process.

Creating and using a recovery USB drive

You can create a recovery USB drive as a backup for the Windows recovery programs. With the recovery

USB drive, you can troubleshoot and fix the problems even if the preinstalled Windows recovery programs

are damaged.

Creating a recovery USB drive

The USB drive that you use to create the recovery USB drive must be at least 16 GB of storage. The actual

USB capacity that is required depends on the size of the recovery image.

Attention: The creation process deletes anything stored on the USB drive. To avoid data loss, make a

backup copy of all the data that you want to keep.

To create a recovery USB drive, do the following:

Note: Ensure that your computer is connected to ac power during the following process.

1. Connect a proper USB drive (at least 16 GB of storage).

2. Type recovery in the search box on the taskbar. Then click Create a recovery drive.

3. Click Yes in the User Account Control window to allow the Recovery Media Creator program to start.

4. In the Recovery Drive window, follow the on-screen instructions to create a recovery USB drive.

Using the recovery USB drive

If you cannot start your computer, use the recovery USB drive to recover your computer.

To use a recovery USB drive, do the following:

Note: Ensure that your computer is connected to ac power.

1. Connect the recovery USB drive to the computer.

2. Turn on or restart the computer. Before the Windows operating system starts, repeatedly press the F12

key. The Boot Menu window opens.

3. Select the recovery USB drive as the boot device.

4. Select a preferred keyboard layout.

5. Click Troubleshoot to display the optional recovery solutions.

6. Select a corresponding recovery solution according to your situation. Then follow the instructions on the

screen to complete the process.

32 T490s and X390 Hardware Maintenance Manual

Passwords

As many as three passwords might be needed for a ThinkPad notebook computer: the power-on password,

the hard disk password, and the supervisor 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 turned on by an unauthorized person. The password

must be entered before the 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 34.

Hard disk password

There are two 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 a master hard disk password has been set, it can be used to access the solid-state drive. If

no master hard disk password is available, neither Lenovo nor Lenovo authorized service technicians provide

any services to reset either the user hard disk password or the master hard disk password, or to recover data

from the solid-state drive. The solid-state drive can be replaced for a scheduled fee.

For instructions on how to remove the hard disk password, see “How to remove the hard disk password” on

page 34.

Supervisor password

The supervisor password protects the system information stored in UEFI BIOS. It provides the following

security features:

• If only a supervisor password is set, a password prompt is displayed when you try to enter the UEFI BIOS

menu. Unauthorized users cannot change most of the system configuration options in the UEFI BIOS

menu 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.

Chapter 4.Related service information 33

How to remove the power-on password

To remove the power-on password, do one of the following:

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

1. Turn off the computer.

2. Remove the battery. For instructions on how to remove the battery, see “1080 Built-in battery” on page

79.

3. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see “1090 Coin-

cell battery” on page 81.

4. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt will not

be displayed. The power-on password has been removed.

5. Reinstall the coin-cell battery and the battery.

If a supervisor 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 ThinkPad logo is displayed, immediately press F1.

3. Type the supervisor password to enter the UEFI BIOS menu.

4. Select Security.

5. Select Password.

6. Select Power-On 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.

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 password, or to recover data from the solid-state drive. The solid-

state drive can be replaced for a scheduled fee. To put the system back to operational status, the only

Lenovo and Lenovo-authorized service solution would be to replace the solid-state drive with a scheduled

fee.

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

master hard disk password are known, do the following:

1. Turn on the computer.

2. When the logo screen is displayed, immediately press F1 to enter the UEFI BIOS menu.

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 HDP, where HDP stands for 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 user hard disk password and the master hard disk password

have been removed.

34 T490s and X390 Hardware Maintenance Manual

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 solid-state drive is powered off.

• The microprocessor stops.

To put your computer into sleep mode, open the Start menu, click Power, and then click Sleep.

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

To cause the computer to return from sleep mode and resume operation, do one of the following:

• Press any key.

• Open the LCD cover.

• Turn on the power button.

Also, in either of the following events, the computer automatically returns from sleep mode and resumes

operation:

• The ring indicator (RI) is signaled by a serial device or a PC Card device.

• The time set on the resume timer elapses.

Note: The computer does not accept any input immediately after it enters sleep mode. Wait a few

seconds before taking any action to reenter operation mode.

Hibernation mode

In hibernation mode, the following occurs:

• The system status, RAM, VRAM, and setup data are stored on the solid-state drive.

• The system is powered off.

Note: If the computer enters the hibernation mode while it is connected to the dock, do not disconnect it

before resuming normal operation. If you do disconnect 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 solid-state drive is read, and system status is restored from the

solid-state drive.

Chapter 4.Related service information 35

Symptom-to-FRU index

This section contains following information:

• “Numeric error codes” on page 36

• “Error messages” on page 37

• “Beep errors” on page 38

• “No-beep symptoms” on page 39

• “LCD-related symptoms” on page 40

• “Intermittent problems” on page 41

• “Undetermined problems” on page 41

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 41.

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

for that device.

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

EEAIA 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.

2. Replace the battery.

36 T490s and X390 Hardware Maintenance Manual

Table 2. Numeric error codes (continued)

Symptom or error FRU or action, in sequence

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

Real-Time Clock Error. Check Date and Time settings.

1. Run ThinkPad Setup to reset the time and date.

2. Replace the coin-cell battery and run the ThinkPad

Setup program to reset the time and date.

1802

Unauthorized network card is plugged in - Turn off and

remove the network card.

1. Remove the 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 Main HDD (SSD0) or Detection error on

Main HDD (HDD0)

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

2. Replace the M.2 solid-state drive.

3. Replace the system board.

2110

Read error on Main HDD (SSD0) or Read error on Main

HDD (HDD0)

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

2. Replace the M.2 solid-state drive.

3. Replace the system board.

2200

Machine Type and Serial Number are invalid.

Have the computer serviced.

2201

Machine UUID is invalid

Replace the system board.

2202

Brand Name is invalid.

Have the computer serviced.

2203

System configuration is invalid.

Have the computer serviced.

2204

System configuration data is invalid.

Have the computer serviced.

Error messages

Table 3. Error messages

Symptom or error FRU or action, in sequence

Fan error.

(two short beeps)

1. Replace the fan.

2. Apply thermal grease.

3. Replace the system board.

Thermal sensing error. Replace the system board.

Chapter 4.Related service information 37

Table 3. Error messages (continued)

Symptom or error FRU or action, in sequence

The battery installed is not supported by this system and

will not charge.

Please replace the battery with the correct Lenovo battery

for this system.

Press the ESC key to continue.

Replace the battery.

This system does not support batteries that are not

genuine Lenovo-made or authorized. The system will

continue to boot, but may not charge unauthorized

batteries. Press the ESC key to continue.

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.

Replace the battery.

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.

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.

38 T490s and X390 Hardware Maintenance Manual

Error codes Solutions

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

battery if your computer has one. Then, 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).

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.

Chapter 4.Related service information 39

Table 4. No-beep symptoms (continued)

Symptom or error FRU or action, in sequence

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 Notebooks 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.

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 connectors.

2. Replace the LCD assembly.

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 connectors.

3. Replace the LCD assembly.

4. Replace the system board.

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

40 T490s and X390 Hardware Maintenance Manual

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, ESD, 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 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 dock

c. Printer, mouse, and other external devices

d. Battery

e. Solid-state drive

f. External diskette drive or optical drive

g. Memory module

h. PC cards

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 assembly

Chapter 4.Related service information 41

42 T490s and X390 Hardware Maintenance Manual

Chapter 5. Special keys

ThinkPad T490s

ThinkPad X390

1. Windows logo key

Open the Start menu.

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

information.

2. 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.

3. 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.

Decrease the speaker volume.

Increase the speaker volume.

Mute or unmute the microphones.

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

Darken the computer display.

Brighten the computer display.

Manage external displays.

Enable or disable the built-in wireless features.

Open the Settings window.

Enable or disable the built-in Bluetooth features.

Open a keyboard setting page.

Invoke the function defined by yourself:

1. Open the Start menu and click Lenovo Vantage.

2. Click Hardware Settings and then click Input.

3. Locate the Keyboard: User-defined Key section and follow the on-screen

instructions to complete the setting.

On this setting page, you can also define different functions for the key

combinations with F12, such as Shift+F12, Alt+F12, or Ctrl+F12.

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.

44 T490s and X390 Hardware Maintenance Manual

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.Special keys 45

46 T490s and X390 Hardware Maintenance Manual

Chapter 6. Locations

Locating computer controls, connectors, and indicators

Front

1. Infrared camera* 4. Camera*

2. ThinkShutter* 5. Multi-touch screen*

3. Microphones*

* for selected models

Base

ThinkPad T490s

ThinkPad X390

1. Power button 4. NFC mark*

2. Fingerprint reader* 5. TrackPoint® pointing device

3. Trackpad

* for selected models

48 T490s and X390 Hardware Maintenance Manual

Left

1. USB-C™ connector (USB 3.1 Gen 1) 5. USB 3.1 connector Gen 1

2. Thunderbolt™ 3 connector (USB-C) 6. HDMI™ connector

3. Ethernet extension connector Gen 2 7. Audio connector

4. Docking-station connector

Right

1. Smart-card slot* 3. Security-lock slot

2. Always On USB 3.1 connector Gen 1

* for selected models

Chapter 6.Locations 49

Rear

1. System status indicator 2. Nano-SIM-card and microSD-card slot

50 T490s and X390 Hardware Maintenance Manual

Bottom

ThinkPad T490s

ThinkPad X390

1. Docking-station hook holes 3. Speakers

2. Emergency-reset hole

Locating FRUs and CRUs

This topic introduces the following service parts:

• “Major FRUs and CRUs” on page 52

• “LCD FRUs and CRUs” on page 58

• “Miscellaneous parts” on page 60

• “Connector and cable guide” on page 60

Chapter 6.Locations 51

Notes:

• 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 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 and FRUs:

– Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by trained

service technicians at an additional cost.

– Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill level.

Trained service technicians can also provide service to install or replace the parts under the type of warranty

designated for the customer’s machine.

– FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers choose

to replace the FRUs by themselves, the product warranty might be affected.

Major FRUs and CRUs

Notes:

• Depending on the computer model, your computer might look different from the illustration above.

• The Lenovo factory recovery USB key a 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.

52 T490s and X390 Hardware Maintenance Manual

ThinkPad T490s

Chapter 6.Locations 53

Table 6. Major FRUs and CRUs

No. FRU description Self-service

CRU

Optional-service

CRU

1LCD unit No No

2Trackpad No No

3Keyboard assembly No No

4Docking-station-connector bracket No No

5Power card No No

6Power-card cable No No

7Wireless WAN card* Yes No

8USB-card cable No No

9USB card No No

10 Thermal fan assembly No No

11 Smart card reader* No No

12 Dummy smart card reader* No No

13 Fingerprint-reader-and-smart-card-reader cable* No No

14 Fingerprint-reader cable* No No

15 Smart-card-reader cable* No No

16 Fingerprint-reader bracket* No No

17 Fingerprint reader* No No

18 Base cover assembly Yes No

19 Trackpad cable (for non-NFC models)* No No

20 Trackpad cable (for NFC models)* No No

21 NFC card* No No

22 Built-in battery No No

23 Speaker assembly No No

24 M.2 2242 solid-state drive bracket* Yes No

25 M.2 2242 solid-state drive* Yes No

26 Thermal pad for M.2 2242 solid-state drive* No No

27 System board No No

28 Coin-cell battery No No

29 M.2 2280 solid-state drive* Yes No

30 Thermal pad for M.2 2280 solid-state drive* No No

31 TrackPoint cap Yes No

32 Nano-SIM-card and microSD-card tray Yes No

aLenovo factory recovery USB key* Yes No

bPower cord Yes No

54 T490s and X390 Hardware Maintenance Manual

Table 6. Major FRUs and CRUs (continued)

No. FRU description Self-service

CRU

Optional-service

CRU

cac power adapter Yes No

dMiscellaneous parts kits (see “Miscellaneous parts” on page 60) No No

* for selected models

Chapter 6.Locations 55

ThinkPad X390

56 T490s and X390 Hardware Maintenance Manual

Table 7. Major FRUs and CRUs

No. FRU description Self-service

CRU

Optional-service

CRU

1LCD unit No No

2Trackpad No No

3Keyboard bezel assembly No No

4Docking-station-connector bracket No No

5Power card No No

6Power-card cable No No

7Wireless WAN card* Yes No

8USB-card cable No No

9USB card No No

10 Thermal fan assembly No No

11 Smart card reader* No No

12 Dummy smart card reader* No No

13 Fingerprint-reader-and-smart-card-reader cable* No No

14 Fingerprint-reader cable* No No

15 Base cover assembly Yes No

16 Fingerprint-reader bracket* No No

17 Fingerprint reader* No No

18 Trackpad cable (for non-NFC models)* No No

19 Trackpad cable (for NFC models)* No No

20 NFC card* No No

21 Built-in battery No No

22 M.2 2280 solid-state drive* Yes No

23 Thermal pad for M.2 2280 solid-state drive* No No

24 Speaker assembly No No

25 System board No No

26 M.2 2242 solid-state drive bracket* Yes No

27 M.2 2242 solid-state drive* Yes No

28 Thermal pad for M.2 2242 solid-state drive* No No

29 Coin-cell battery No No

30 Nano-SIM-card and microSD-card tray Yes No

31 Keyboard No Yes

32 TrackPoint cap Yes No

aLenovo factory recovery USB key* Yes No

bPower cord Yes No

Chapter 6.Locations 57

Table 7. Major FRUs and CRUs (continued)

No. FRU description Self-service

CRU

Optional-service

CRU

cac power adapter Yes No

dMiscellaneous parts kits (see “Miscellaneous parts” on page 60) No No

* for selected models

LCD FRUs and CRUs

58 T490s and X390 Hardware Maintenance Manual

Table 8. LCD FRUs and CRUs

No. FRU description Self-service

CRU

Optional-service

CRU

1LCD bezel cover No No

2LCD bezel No No

3LCD cable No No

4Camera and microphone module No No

5Aluminum foil (for ThinkPad T490s only) No No

6LCD panel No No

7Antenna kit No No

8LCD hinges No No

9Camera-and-microphone-module cable* No No

10 LCD cover assembly No No

* Depending on the computer model, the cable might look different from the illustration above. For more

information about the cable types, see “2050 Camera-and-microphone-module cable and antenna kit” on

page 101.

Chapter 6.Locations 59

Miscellaneous parts

Table 9. Miscellaneous part

FRU descriptions Self-service

CRU

Optional-service

CRU

Screw kit

• For ThinkPad T490s:

– M2 x L2, black (4)

– M2 x L2.2 + 2.4, black (4)

– M2.5 x L5, silver (6)

– M2 x L2.2, black (10)

– M2 x L3, silver (7)

– M2 x L4.5, black (6)

– M2.5 x L2.3, black (4)

– Spec

• For ThinkPad X390:

– M2 x L1.8, silver (4)

– M2.5 x L4.5, silver (6)

– M2 x L3, silver (7)

– M2 x L4.5, black (5)

– M2.5 x L2.5, black (4)

– M2 x L2.2 + 2.5, black (4)

– M2 x L2.2, black (10)

– Spec

No No

Mechanical miscellaneous kit

• Microphone rubber

• WWAN card mylar

• Smart card reader mylar

• Spec

No No

Label kit:

• Label

• Spec

No No

Connector and cable guide

This topic 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” on page 52 and “LCD FRUs and CRUs” on page 58.

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

60 T490s and X390 Hardware Maintenance Manual

System board connectors and cables

Table 10. System board connector and cable guide

No. Connector/feature Internal cable required Cable connection

1dc-in connector (internal) dc-in cable Connect one end to the power card

and the other end to this

connector.

2Camera connector (internal) camera-and-microphone-module

cable

Connect one end to the camera

and microphone module and the

other end to this connector.

3Thermal fan connector (internal) Thermal fan cable The thermal fan comes with the

cable. Connect the cable to this

connector.

4Wireless-WAN card slot (internal) No Insert a wireless-WAN card into

this slot.

5LCD connector (internal) LCD cable Connect one end to the LCD panel

and the other end to this

connector.

6Solid-state drive slot (internal) No Insert a solid state drive into this

slot.

7USB-C connector (USB 3.1 Gen 1)

(external)

No Connect a USB-C compatible

device to this connector.

Chapter 6.Locations 61

Table 10. System board connector and cable guide (continued)

No. Connector/feature Internal cable required Cable connection

8Thunderbolt 3 connector (USB-C)

(external)

No Connect a USB-C compatible or

Thunderbolt 3 compatible device

to this connector.

9Ethernet extension connector Gen

2 (external)

No This connector does not work

individually. The connectors 6, 7,

and 8 work together as the

docking-station connector.

10 USB 3.1 connector Gen 1 (external) No Connect a USB-C compatible

device to this connector.

11 HDMI connector (external) No Connect a compatible digital audio

device or video monitor to this

connector.

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

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

pole plug to this connector.

13 Coin-cell battery connector

(internal)

Coin-cell battery cable The coin-cell battery comes with

cable. Connect the cable to this

connector.

14 Speaker connector (internal) Speaker cable The speaker comes with the cable.

Connect the cable to this

connector.

Keyboard connectors for ThinkPad

T490s (internal)

Keyboard assembly cables The keyboard assembly comes

with the cables. Connect the

cables to these connectors.

17 Battery connector (internal) No The battery comes with the cable.

Connect the cable to this

connector.

18 Trackpad and NFC connector

(internal)

Trackpad cable (for non-NFC

models) or trackpad cable (for NFC

models)

For Trackpad cable (for non-NFC

models), connect one end to the

trackpad and the other end to this

connector.

For Trackpad cable (for NFC

models), connect one end to the

trackpad, one end to the NFC card,

and the other end to this

connector.

62 T490s and X390 Hardware Maintenance Manual

Table 10. System board connector and cable guide (continued)

No. Connector/feature Internal cable required Cable connection

19 Smart card reader and fingerprint

reader connector (internal)

Smart-card-reader cable,

fingerprint-reader cable, or smart

card reader and fingerprint-reader

cable

For smart-card-reader cable,

connect one end to the smart card

reader and the other end to this

connector.

For fingerprint-reader cable,

connect one end to the fingerprint

reader and the other end to this

connector.

For smart card reader and

fingerprint-reader cable, connect

one end of the cable to the smart

card reader, one end to the

fingerprint reader, and the other

end to this connector.

20 Always On USB 3.1 connector Gen

1 (external)

No Connect a USB-A compatible

device to this connector.

21 Nano-SIM-card and microSD-card

slot (external)

No Insert a microSD card or Nano

Subscriber Identity Module (SIM)

card into this slot.

Keyboard connector for ThinkPad

X390 (internal)

Keyboard assembly cables The keyboard assembly comes

with the cables. Connect the

cables to these connectors.

Looking up FRU information

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

https://support.lenovo.com/partslookup

Chapter 6.Locations 63

64 T490s and X390 Hardware Maintenance Manual

Chapter 7. FRU replacement notices

Read this chapter carefully before replacing any FRU.

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 the computer:

• 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 angle of 90 degrees after the screw head touches the surface of the plastic part.

• Logic card to plastic

Turn an additional angle of 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 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 66

• “Retaining the UUID” on page 66

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.

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:

Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the

ThinkPad Setup program is set to UEFI Only.

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.

66 T490s and X390 Hardware Maintenance Manual

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:

Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the

ThinkPad Setup program is set to UEFI Only.

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.

Reading or writing the ECA information

Information on 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 the box build date, select 5. Read box build date from EEPROM,

and follow the instruction 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

instructions on the screen. To write the 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.

Chapter 7.FRU replacement notices 67

68 T490s and X390 Hardware Maintenance Manual

Chapter 8. Removing or replacing a FRU

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

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 65.

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,

disable the built-in battery, 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 ESD. Before touching it, establish personal

grounding by touching a ground point with one hand or by using an ESD 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:

1. Go to Control Panel and view by 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:

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

menu.

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 microSD-card tray

Note: If the computer you are servicing has a nano-SIM card or microSD card installed, remove the card

with the tray together.

1010 Keyboard (for ThinkPad X390 only)

Removal steps

Note: If the keyboard must be removed to access other FRUs, you need the keyboard removal tool (product

part number: 01LX856) to remove the keyboard. You can purchase the tool as a separate FRU at https://

support.lenovo.com/partslookup.

a b

70 T490s and X390 Hardware Maintenance Manual

c d

Chapter 8.Removing or replacing a FRU 71

When installing: Ensure that the connectors are attached firmly.

1020 Base cover assembly

Removal steps

72 T490s and X390 Hardware Maintenance Manual

Applying labels to the base cover assembly

Note: Depending on the country or region of delivery, the labels might be slightly different from the ones in

the following illustration.

The new base cover assembly FRU is shipped with a kit containing labels of several kinds. Apply those labels

when you replace the base cover assembly. For the labels that are not shipped with the new base cover

assembly, peel them from the old base cover assembly, and adhere them to the new one.

ThinkPad T490s ThinkPad X390

1 GEO and system label 2 Genuine Microsoft label (Windows 10)

3 COA label 4 IMEI label

5 S/N label 6 Asset tag

7 Country label 8 CMIIT label

1030 M.2 solid-state drive, bracket, and thermal pad

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Chapter 8.Removing or replacing a FRU 73

Attention: 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.

For computer models that support the Intel Optane technology, disable the Intel Optane memory before

removing it. To disable the Intel Optane memory, do the following:

1. Restart the computer. When the logo screen is displayed, press F1.

Note: If a supervisor password has been set, enter the correct password when prompted. You also can

press Enter to skip the password prompt and enter the BIOS menu. However, you cannot change the

system configurations that are protected by the supervisor password.

2. Select Config ➙ Storage ➙ Intel (R) Rapid Storage Technology ➙ Intel Optane ➙ Disable.

3. Select to preserve user data and select Yes to confirm your operation.

4. Select Disable and wait for the process to complete.

Note: The disabling process may take from a couple of minutes to hours. Do not restart the computer

until the process is completed.

5. Press F10 to save changes and exit.

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

74 T490s and X390 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

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

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (2) Black 0.181 Nm

(1.85 kgf-cm)

1040 Wireless WAN card

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Chapter 8.Removing or replacing a FRU 75

Removal steps

Step Screw (quantity) Color Torque

2M2 × 2.2 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

When installing: Plug the orange cable into the main connector, and the blue cable into the auxiliary

connector on the card.

1050 Docking-station-connector bracket

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Removal steps

Step Screw (quantity) Color Torque

1M2 × 4.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

76 T490s and X390 Hardware Maintenance Manual

When installing: Ensure that the two latches on the bracket are secured in place.

1060 Thermal fan assembly

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Removal steps

When installing:

• Ensure that the connector is attached firmly.

• Do not press the top of the fan cover and the fan hub.

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

the part 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.

1070 USB-card cable and USB card

For access, remove these FRUs:

• “1020 Base cover assembly” on page 72

• “1060 Thermal fan assembly” on page 77

Chapter 8.Removing or replacing a FRU 77

Removal steps of the USB-card cable

Removal steps of the USB card

Step Screw (quantity) Color Torque

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

(1.85 kgf-cm)

78 T490s and X390 Hardware Maintenance Manual

1080 Built-in battery

DANGER

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

explode.

Important notice 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.

The Lenovo Vantage program provides an automatic battery diagnostic test that determines if the battery is defective.

A battery FRU should not be replaced unless this diagnostic test shows that the battery is defective. The only

exception to this is if the battery is physically damaged or a customer is reporting a possible safety issue. Note that a

physically damaged battery is a non-warranty replacement part.

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Removal steps

ThinkPad T490s

Step Screw (quantity) Color Torque

2M2 × 4.5 mm, flat-head, nylon-coated (5) Black 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 79

ThinkPad X390

Step Screw (quantity) Color Torque

2M2 × 4.5 mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

When installing:

• Ensure that the connector is attached firmly.

• Ensure that the base cover assembly is secured in place. Otherwise, the battery connection may fail.

80 T490s and X390 Hardware Maintenance Manual

1090 Coin-cell battery

DANGER

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

explode.

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

Removal steps

When installing: Ensure that the connector is attached firmly.

1100 Trackpad cable

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

Chapter 8.Removing or replacing a FRU 81

Removal steps of trackpad cable (for NFC models)

Removal steps of trackpad cable (for non-NFC model)

When installing: Ensure that the connectors are attached firmly.

1110 Trackpad

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

82 T490s and X390 Hardware Maintenance Manual

Removal steps of trackpad (for NFC models)

Table 11. Screw specification (ThinkPad T490s)

Step Screw (quantity) Color Torque

7M2 × 2 mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

Table 12. Screw specification (ThinkPad X390)

Step Screw (quantity) Color Torque

7M2 × 1.8 mm, flat-head, nylon-coated (4) Silver 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 83

Removal steps of trackpad (for non-NFC model)

Table 13. Screw specification (ThinkPad T490s)

Step Screw (quantity) Color Torque

4M2 × 2 mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

Table 14. Screw specification (ThinkPad X390)

Step Screw (quantity) Color Torque

4M2 × 1.8 mm, flat-head, nylon-coated (4) Silver 0.181 Nm

(1.85 kgf-cm)

When installing: Ensure that the connectors are attached firmly.

1120 NFC card

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

84 T490s and X390 Hardware Maintenance Manual

Removal steps

1130 Speaker assembly

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

Removal steps

ThinkPad T490s

Step Screw (quantity) Color Torque

2M2 x (2.2 + 2.4) mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 85

ThinkPad X390

Step Screw (quantity) Color Torque

2M2 x (2.2 + 2.5) mm, flat-head, nylon-coated (4) Black 0.181 Nm

(1.85 kgf-cm)

When installing:

• Ensure that the connector is attached firmly.

86 T490s and X390 Hardware Maintenance Manual

• Ensure that the cable is routed properly.

1140 Fingerprint-reader-and-smart-card-reader cable, fingerprint-reader

cable, and smart-card-reader cable (for ThinkPad T490s only)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

ThinkPad T490s

• Removal steps of the fingerprint-reader-and-smart-card-reader cable

• Removal steps of the fingerprint-reader cable

• Removal steps of the smart-card-reader cable

Chapter 8.Removing or replacing a FRU 87

ThinkPad X390

• Removal steps of the fingerprint-reader-and-smart-card-reader cable

Note: For models without fingerprint reader, skip step 3 and 4.

• Removal steps of the fingerprint-reader cable

When installing: Ensure that the connectors are attached firmly.

1150 Fingerprint-reader bracket and fingerprint reader

For access, remove these FRUs in order:

88 T490s and X390 Hardware Maintenance Manual

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

• “1140 Fingerprint-reader-and-smart-card-reader cable, fingerprint-reader cable, and smart-card-reader

cable (for ThinkPad T490s only)” on page 87

Removal steps

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (1) Black 0.181 Nm

(1.85 kgf-cm)

1160 Smart card reader or dummy smart card reader

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1080 Built-in battery” on page 79

• “1130 Speaker assembly” on page 85

• “1140 Fingerprint-reader-and-smart-card-reader cable, fingerprint-reader cable, and smart-card-reader

cable (for ThinkPad T490s only)” on page 87

ThinkPad T490s

Removal steps of the smart card reader

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (3) Black 0.181 Nm

(1.85 kgf-cm)

Chapter 8.Removing or replacing a FRU 89

Removal steps of the dummy smart card reader

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (2) Black 0.181 Nm

(1.85 kgf-cm)

ThinkPad X390

Removal steps of the smart card reader

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (3) Black 0.181 Nm

(1.85 kgf-cm)

Removal steps of the dummy smart card reader

90 T490s and X390 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

1M2 × 2.2 mm, flat-head, nylon-coated (3) Black 0.181 Nm

(1.85 kgf-cm)

1170 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.

ThinkPad T490s and ThinkPad X390 share a common system board. After replacing the system board, you

will be prompted to input a brand name to correctly identify the machine type. The following table contains

the brand name required to complete this step.

Note: Input the exact brand name as shown in this table.

Brand name Machine types

ThinkPad T490s 20NX and 20NY

ThinkPad X390 20Q0 and 20Q1

For access, remove these FRUs in order:

Chapter 8.Removing or replacing a FRU 91

ThinkPad T490s ThinkPad X390

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

• “1080 Built-in battery” on page 79

• “1010 Keyboard (for ThinkPad X390 only)” on page 70

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

Removal steps

ThinkPad T490s

92 T490s and X390 Hardware Maintenance Manual

Step Screw (quantity) Color Torque

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

(1.85 kgf-cm)

21 M2 × 2.2 mm, flat head, nylon-coated (2) Black 0.181 Nm

(1.85 kgf-cm)

When installing: Ensure that the connectors are attached firmly.

ThinkPad X390

Chapter 8.Removing or replacing a FRU 93

Step Screw (quantity) Color Torque

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

(1.85 kgf-cm)

18 M2 × 2.2 mm, flat head, nylon-coated (2) Black 0.181 Nm

(1.85 kgf-cm)

When installing: Ensure that the connectors are attached firmly.

Attention: The Central Processing Unit (CPU) a soldered on the top side of the system board is extremely

sensitive. When you service the system board, avoid any kind of rough handling.

94 T490s and X390 Hardware Maintenance Manual

1180 Power-card cable and power card

Removal steps of the power-card cable

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Removal steps of the power card

For access, remove these FRUs in order:

ThinkPad T490s ThinkPad X390

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

• “1080 Built-in battery” on page 79

• “1170 System board” on page 91

• “1010 Keyboard (for ThinkPad X390 only)” on page 70

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

• “1170 System board” on page 91

Chapter 8.Removing or replacing a FRU 95

Step Screw (quantity) Color Torque

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

(1.85 kgf-cm)

When installing: Ensure that the connector is attached firmly.

1190 LCD unit

For access, remove this FRU:

• “1020 Base cover assembly” on page 72

Removal steps

Table 15. Screw specification (ThinkPad T490s)

Step Screw (quantity) Color Torque

1M 2.5 × 5 mm, flat-head, nylon-coated (6) Silver 0.294 Nm

(3.0 kgf-cm)

96 T490s and X390 Hardware Maintenance Manual

Table 16. Screw specification (ThinkPad X390)

Step Screw (quantity) Color Torque

1M 2.5 × 4.5 mm, flat-head, nylon-coated (6) Silver 0.294 Nm

(3.0 kgf-cm)

When installing: Ensure that the connectors are attached firmly.

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.

Chapter 8.Removing or replacing a FRU 97

1200 Keyboard assembly (for ThinkPad T490s) or Keyboard bezel

assembly (for ThinkPad X390)

ThinkPad T490s ThinkPad X390

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

• “1070 USB-card cable and USB card” on page 77

• “1080 Built-in battery” on page 79

• “1090 Coin-cell battery” on page 81

• “1100 Trackpad cable” on page 81

• “1110 Trackpad” on page 82

• “1120 NFC card” on page 84

• “1130 Speaker assembly” on page 85

• “1140 Fingerprint-reader-and-smart-card-reader

cable, fingerprint-reader cable, and smart-card-reader

cable (for ThinkPad T490s only)” on page 87

• “1150 Fingerprint-reader bracket and fingerprint

reader” on page 88

• “1160 Smart card reader or dummy smart card

reader” on page 89

• “1170 System board” on page 91

• “1180 Power-card cable and power card” on page 95

• “1190 LCD unit” on page 96

For access, remove these FRUs in order:

• “1010 Keyboard (for ThinkPad X390 only)” on page 70

• “1020 Base cover assembly” on page 72

• “1030 M.2 solid-state drive, bracket, and thermal pad”

on page 73

• “1040 Wireless WAN card” on page 75

• “1050 Docking-station-connector bracket” on page 76

• “1060 Thermal fan assembly” on page 77

• “1070 USB-card cable and USB card” on page 77

• “1080 Built-in battery” on page 79

• “1090 Coin-cell battery” on page 81

• “1100 Trackpad cable” on page 81

• “1110 Trackpad” on page 82

• “1120 NFC card” on page 84

• “1130 Speaker assembly” on page 85

• “1140 Fingerprint-reader-and-smart-card-reader

cable, fingerprint-reader cable, and smart-card-reader

cable (for ThinkPad T490s only)” on page 87

• “1150 Fingerprint-reader bracket and fingerprint

reader” on page 88

• “1160 Smart card reader or dummy smart card

reader” on page 89

• “1170 System board” on page 91

• “1180 Power-card cable and power card” on page 95

• “1190 LCD unit” on page 96

2010 LCD bezel cover and LCD bezel

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

98 T490s and X390 Hardware Maintenance Manual

Removal steps

When installing: Ensure that all the latches are attached firmly.

2020 LCD hinges

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

• “2010 LCD bezel cover and LCD bezel” on page 98

Removal steps

Table 17. Screw specification for ThinkPad T490s

Step Screw (quantity) Color Torque

1M2.5 × 2.3 mm, flat-head, nylon-coated (4) Black 0.294 Nm

(3.0 kgf-cm)

Chapter 8.Removing or replacing a FRU 99

Table 18. Screw specification for ThinkPad X390

Step Screw (quantity) Color Torque

1M2.5 × 2.5 mm, flat-head, nylon-coated (4) Black 0.294 Nm

(3.0 kgf-cm)

2030 LCD panel and LCD cable

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

• “2010 LCD bezel cover and LCD bezel” on page 98

• “2020 LCD hinges” on page 99

Removal steps

Attention: If the LCD panel is fixed to the LCD cover assembly by tapes, remove the LCD panel carefully.

Inappropriate handling might cause damage to the LCD panel.

When installing: Ensure that the connector is attached firmly.

2040 Camera and microphone module and aluminum foil (for ThinkPad

T490s only)

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

• “2010 LCD bezel cover and LCD bezel” on page 98

• “2020 LCD hinges” on page 99

• “2030 LCD panel and LCD cable” on page 100

100 T490s and X390 Hardware Maintenance Manual

Note: Depending on the type of the camera-and-microphone-module cable, the disconnection steps of the

cable might be different from the following illustrations. For more information, see “2050 Camera-and-

microphone-module cable and antenna kit” on page 101.

Removal steps of the camera and microphone module and aluminum foil (for ThinkPad T490s only)

Removal steps of the camera and microphone module

2050 Camera-and-microphone-module cable and antenna kit

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

• “2010 LCD bezel cover and LCD bezel” on page 98

• “2020 LCD hinges” on page 99

Chapter 8.Removing or replacing a FRU 101

• “2030 LCD panel and LCD cable” on page 100

102 T490s and X390 Hardware Maintenance Manual

Camera-and-microphone-module cable types

Depending on the computer model, the camera-and-microphone-module cable might be one of the following

types.

ThinkPad T490s ThinkPad X390

For models with IR camera, microphone, and system

status indicator

For models with conventional camera, microphone, and

system status indicator

For models with system status indicator only

For models with IR camera, microphone, and system

status indicator

For models with conventional camera, microphone, and

system status indicator

For models with microphone and system status indicator

For models with system status indicator only

Chapter 8.Removing or replacing a FRU 103

Removal steps of the camera-and-microphone-module cable

Note: Depending on the type of the camera-and-microphone-module cable, the disconnection steps of the

cable might be different from the following illustration. For models without camera, skip the disconnection

steps of the cable.

Removal steps of the antenna kit

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.

104 T490s and X390 Hardware Maintenance Manual

Antenna locations

a Wireless LAN main antenna (gray)

b Wireless WAN main antenna (orange, for selected models)

c Wireless WAN auxiliary antenna (blue, for selected models)

d Wireless LAN auxiliary antenna (black)

2060 LCD cover assembly

For access, remove these FRUs in order:

• “1020 Base cover assembly” on page 72

• “1190 LCD unit” on page 96

• “2010 LCD bezel cover and LCD bezel” on page 98

• “2020 LCD hinges” on page 99

• “2030 LCD panel and LCD cable” on page 100

• “2040 Camera and microphone module and aluminum foil (for ThinkPad T490s only)” on page 100

• “2050 Camera-and-microphone-module cable and antenna kit” on page 101

Chapter 8.Removing or replacing a FRU 105

106 T490s and X390 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 on the products and services currently available in your

area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that

Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service

that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user’s

responsibility to evaluate and verify the operation of any other product, program, or service.

Lenovo may have patents or pending patent 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.

1009 Think Place - Building One

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.

Electromagnetic emission notices

For electromagnetic emission information on Class B digital devices, refer to the corresponding information

in the User Guide.

EU Contact: Lenovo (Slovakia), Landererova 12, 811 09 Bratislava, Slovakia

Trademarks

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

Optane and Thunderbolt are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other

countries. 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

108 T490s and X390 Hardware Maintenance Manual

Appendix B. Abbreviation table

The following table lists all abbreviations used in this manual.

Abbreviation Term

BGA Ball Grid Array

CMOS Complementary Metal Oxide Semiconductor

CMV Custom Model Variant

CRC Cyclic redundancy check

CRT Cathode ray tube

CRU Customer Replaceable Unit

CTO Configure To Order

EAIA Enhanced Asset Information Area

EEPROM Electrically Erasable Programmable Read-Only Memory

EFI Extensible Firmware Interface

ESD Electrostatic discharge

FRU Field Replaceable Unit

GAV General Announce Variant

IC Integrated circuits

LCD Liquid Crystal Display

MTM Machine type and model

POST Power-on self-test

RFID Radio-frequency identification

SVP Supervisor password

UUID Universally unique identifier

110 T490s and X390 Hardware Maintenance Manual

Part Number: SP40T09974

Printed in China

(1P) P/N: SP40T09974

*1PSP40T09974*

Table of Contents

Lenovo T490s User Manual

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