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. Status indicators
Chapter 6. Using the special keys
Chapter 7. Locations
Chapter 8. FRU replacement notices
- Screw notices
- Retaining serial numbers
Chapter 9. Removing or replacing a FRU
Appendix A. Notices
- Electronic emissions notices
- Trademarks
Appendix B. Abbreviation table

Lenovo 01YU877 User Manual

Displayed below is the user manual for 01YU877 by Lenovo which is a product in the Notebook Spare Parts category. This manual has pages.

Related Manuals

Lenovo Lenovo Y Gaming Stereo Headset Manual

Lenovo Lenovo Legion 5 15ACH6A Manual

Lenovo Lenovo Tab P11 5G Manual

Lenovo Lenovo Legion 5 Pro Manual

T480

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 103.

First Edition (January 2018)

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services

Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-

35F-05925.

Contents

About this manual . . . . . . . . . . . . iii

Chapter 1. Safety information . . . . . . 1

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

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

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

Handling devices that are sensitive to electrostatic

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

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

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

Chapter 2. Important service

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

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

Strategy for replacing a hard disk drive or a

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

Important notice for replacing a system

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

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

Strategy for replacing FRUs for CTO, special-bid,

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

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

FRU identification . . . . . . . . . . . . 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 removable battery and the

operational charging . . . . . . . . . . . 29

Checking the coin-cell battery . . . . . . . 30

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 . . . . . . . . . . . 35

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

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

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

No-beep symptoms . . . . . . . . . . . 40

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

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

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

Chapter 5. Status indicators . . . . . 43

Chapter 6. Using the special keys. . . 45

Chapter 7. Locations . . . . . . . . . 47

Locating computer controls, connectors, and

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

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

Left-side view . . . . . . . . . . . . . . 48

Right-side view . . . . . . . . . . . . . 48

Bottom view . . . . . . . . . . . . . . 49

Locating FRUs and CRUs . . . . . . . . . . . 49

Major FRUs and CRUs . . . . . . . . . . 51

LCD FRUs . . . . . . . . . . . . . . . 53

Miscellaneous parts . . . . . . . . . . . 54

Connector and cable guide . . . . . . . . 54

Looking up FRU information . . . . . . . . . . 58

Chapter 8. FRU replacement

notices . . . . . . . . . . . . . . . . . 59

Screw notices . . . . . . . . . . . . . . . 59

Retaining serial numbers . . . . . . . . . . . 60

Restoring the serial number of the system

unit . . . . . . . . . . . . . . . . . . 60

Retaining the UUID. . . . . . . . . . . . 61

Reading or writing the ECA information . . . . 61

Chapter 9. Removing or replacing a

FRU. . . . . . . . . . . . . . . . . . . 63

General guidelines. . . . . . . . . . . . . . 63

Disabling the built-in battery . . . . . . . . . . 64

1010 Removable battery . . . . . . . . . . . 64

1020 Nano-SIM card . . . . . . . . . . . . . 65

1030 Base cover assembly . . . . . . . . . . 65

1040 Memory module . . . . . . . . . . . . 68

1050 Internal storage drive . . . . . . . . . . 69

1060 Wireless-WAN card . . . . . . . . . . . 73

1070 Wireless-LAN module . . . . . . . . . . 73

1080 M.2 solid-state drive in the Wireless-WAN-

card slot. . . . . . . . . . . . . . . . . . 74

1090 Keyboard . . . . . . . . . . . . . . . 75

1100 Coin-cell battery . . . . . . . . . . . . 77

1110 Speaker assembly . . . . . . . . . . . 78

1120 Built-in battery . . . . . . . . . . . . . 79

1130 Smart-card reader assembly . . . . . . . 80

1140 I/O bracket and RJ45 bracket . . . . . . . 81

1150 Thermal fan assembly . . . . . . . . . . 82

1160 Trackpad and trackpad cable . . . . . . . 84

1170 System board . . . . . . . . . . . . . 85

1180 Power-button card . . . . . . . . . . . 88

1190 Fingerprint-reader card . . . . . . . . . 88

1200 NFC module . . . . . . . . . . . . . . 90

1210 LCD unit . . . . . . . . . . . . . . . 90

1220 Keyboard bezel assembly . . . . . . . . 92

2010 LCD bezel sheet . . . . . . . . . . . . 93

2020 LCD panel. . . . . . . . . . . . . . . 94

2030 LCD hinge assembly. . . . . . . . . . . 96

2040 Camera/microphone module . . . . . . . 98

2050 Camera and LED cable, and LCD cable . . . 99

2060 Wireless-LAN/WAN antenna assembly and

LCD rear-cover assembly . . . . . . . . . . . 100

Appendix A. Notices. . . . . . . . . . 103

Electronic emissions notices . . . . . . . . . . 104

Trademarks . . . . . . . . . . . . . . . . 104

Appendix B. Abbreviation table . . . . 105

ii T480 Hardware Maintenance Manual

About this manual

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

ThinkPad T480 Machine Type (MT) 20L5 and 20L6

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 T480 Hardware Maintenance Manual

Chapter 1. Safety information

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

ThinkPad notebook computer.

• “General safety” on page 1

• “Electrical safety” on page 1

• “Safety inspection guide” on page 2

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

• “Grounding requirements” on page 4

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

General safety

Follow these rules to ensure general safety:

• Observe good housekeeping in the area of the machines during and after maintenance.

• When lifting any heavy object:

1. Make sure that you can stand safely without slipping.

2. Distribute the weight of the object equally between your feet.

3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.

4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the

muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you

think is too heavy for you.

• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.

• Before you start the machine, make sure that other service technicians and the customer's personnel are

not in a hazardous position.

• Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the

machine.

• Keep your toolcase away from walk areas so that other people will not trip over it.

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

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

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

centimeters (3 inches) from the end.

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

Attention: Metal objects are good electrical conductors.

• Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, using

solvents, or working in any other conditions that might be hazardous to your eyes.

• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that

is worn or defective.

• Reinstall all covers correctly before returning the machine to the customer.

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

louvers or cover them with labels or stickers.

Electrical safety

Observe the following rules when working on electrical equipment.

Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft

material that does not insulate you when working with live electrical currents.Many customers have, near

their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.

Do not use this type of mat to protect yourself from electrical shock.

• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical

accident occurs, you can then operate the switch or unplug the power cord quickly.

• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.

• Disconnect all power before:

– Performing a mechanical inspection

– Working near power supplies

– Removing or installing main units

• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer

to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.

• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:

– Ensure that another person, familiar with the power-off controls, is near you.

Attention: Another person must be there to switch off the power, if necessary.

– Use only one hand when working with powered-on electrical equipment; keep the other hand in your

pocket or behind your back.

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

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

– When using testers, set the controls correctly and use the approved probe leads and accessories for

that tester.

– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as

metal floor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; Instructions for these

precautions are in the safety sections of maintenance information. Use extreme care when measuring high

voltages.

• Regularly inspect and maintain your electrical hand tools for safe operational condition.

• Do not use worn or broken tools and testers.

• Never assume that power has been disconnected from a circuit. First, check that it has been powered off.

• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,

nongrounded power extension cables, power surges, and missing safety grounds.

• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is

conductive; such touching can cause personal injury and machine damage.

• Do not service the following parts with the power on when they are removed from their normal operating

places in a machine:

– Power supply units

– Pumps

– Blowers and fans

– Motor generators

– Similar units as listed above

This practice ensures correct grounding of the units.

• If an electrical accident occurs:

– Use caution; do not become a victim yourself.

– Switch off power.

– Send another person to get medical aid.

Safety inspection guide

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

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

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

potential safety hazards due to attachment of non-ThinkPad features or options not covered by this

inspection guide.

If any unsafe conditions are present, you must determine how serious the apparent hazard could be and

whether you can continue without first correcting the problem.

2T480 Hardware Maintenance Manual

Consider these conditions and the safety hazards they present:

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

electrical shock)

• Explosive hazards, such as a damaged cathode ray tube (CRT) face or a bulging capacitor

• Mechanical hazards, such as loose or missing hardware

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

beginning of every service task. Begin the checks with the power off, and the power cord disconnected.

Checklist:

1. Check exterior covers for damage (loose, broken, or sharp edges).

2. Power off the computer. Disconnect the power cord.

3. Check the power cord for:

a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground

continuity for 0.1 ohm or less between the external ground pin and the frame ground.

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

support.lenovo.com/partslookup

c. Insulation must not be frayed or worn.

4. Check for cracked or bulging batteries.

5. Remove the cover.

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

ThinkPad alterations.

7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or

other liquids, or signs of fire or smoke damage.

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

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

with.

Handling devices that are sensitive to electrostatic discharge

Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to

electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.

Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the

person handling the part are all at the same charge.

Notes:

1. Use product-specific ESD procedures when they exceed the requirements noted here.

2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.

When handling ESD-sensitive parts:

• Keep the parts in protective packages until they are inserted into the product.

• Avoid contact with other people.

• Wear a grounded wrist strap against your skin to eliminate static on your body.

• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when

you are wearing a wrist strap.

• Use a grounded work mat to provide a static-free work surface. The mat is especially useful when

handling ESD-sensitive devices.

• Select a grounding system, such as those listed below, to provide protection that meets the specific

service requirement.

Note: The use of a grounding system to guard against ESD damage is desirable but not necessary.

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

Chapter 1.Safety information 3

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

reference point. You can use coax or connector-outside shells on these systems.

– Use the round ground prong of the ac plug on ac-operated computers.

Grounding requirements

Electrical grounding of the computer is required for operator safety and correct system function. Proper

grounding of the electrical outlet can be verified by a certified electrician.

Safety notices (multilingual translations)

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

• English

• Arabic

• Brazilian Portuguese

• French

• German

• Hebrew

• Japanese

• Korean

• Spanish

• Traditional Chinese

DANGER

4T480 Hardware Maintenance Manual

DANGER

Chapter 1.Safety information 5

6T480 Hardware Maintenance Manual

PERIGO

Chapter 1.Safety information 7

PERIGO

8T480 Hardware Maintenance Manual

PERIGO

DANGER

Chapter 1.Safety information 9

DANGER

VORSICHT

10 T480 Hardware Maintenance Manual

VORSICHT

Chapter 1.Safety information 11

VORSICHT

12 T480 Hardware Maintenance Manual

Chapter 1.Safety information 13

14 T480 Hardware Maintenance Manual

Chapter 1.Safety information 15

16 T480 Hardware Maintenance Manual

Chapter 1.Safety information 17

18 T480 Hardware Maintenance Manual

Chapter 1.Safety information 19

20 T480 Hardware Maintenance Manual

Chapter 2. Important service information

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

by this manual:

• “Strategy for replacing FRUs” on page 21

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

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

– “How to use error message” on page 22

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

– “Product definition” on page 22

– “FRU identification” on page 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 Unified Extensible Firmware Interface basic input/

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

pcsupport.lenovo.com/supportphonelist

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

authorized service technicians are available in the following support site:

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

Strategy for replacing FRUs

Before replacing parts:

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

listed in this manual.

After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before

completing the service action.

To download software fixes, drivers, and UEFI BIOS, go to https://support.lenovo.com and follow the

instructions on the screen.

Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:

• If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the

original FRU before you continue.

• Some computers have both a processor board and a system board. If you are instructed to replace either

the processor board or the system board, and replacing one of them does not correct the problem,

reinstall that board, and then replace the other one.

• If an adapter or a device consists of more than one FRU, any of the FRUs might be the cause of the error.

Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.

Replace only the FRU that changed the symptoms.

Strategy for replacing a hard disk drive or a solid-state drive

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

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

doing this task.

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

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

drive, data or programs can be overwritten.

Important notice for replacing a system board

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

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

Attention: When handling a system board:

• Do not drop a system board or apply any excessive force to it.

• Avoid rough handling of any kind.

• Avoid bending a system board and hard pushing to prevent cracking at each ball-grid-array (BGA)

chipset.

How to use error message

Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed,

begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error

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

for the computer you are servicing.

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

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

Product definition

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

Dynamic configure-to-order (CTO) model

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

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

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

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

Special-bid model

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

machine type model (MTM) consists of a 4-character MT, a 4-character model, and a numeric 2-character

country code is provided to the customer to place orders (example: 20AA000955). The country code

assigned is numeric and does not designate a specific country or region. The custom model factsheet for the

MTM indicates which country the special bid MTM is set up for. Special-bid offering is not generally

announced.

Standard model

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

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

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

20AA0009UK).

FRU identification

Use Lenovo eSupport to identify major FRUs, FRU part numbers, and FRU descriptions for a product at an

MT - serial number level. Examples of major FRUs are hard disk drive, system board, liquid crystal display

(LCD), and memory module.

To identify the major FRUs for a product, do the following:

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

22 T480 Hardware Maintenance Manual

2. Click Warranty & Services.

3. Click Check Warranty Status.

4. On the Warranty Status Lookup page, click Parts Lookup.

5. Type your machine type and serial number, and then click Submit.

eSupport also can be used to view the general FRU list for a product.

To get the general FRU list for a product, do the following:

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

2. Click Parts & Accessories.

3. Follow the instructions on the screen to select product.

4. Click Products and Parts Detail.

5. On the PRODUCT AND PARTS DETAIL page, click the Parts Detail tab to view the FRU list.

Note: The FRU list is a general list of components and does not contain specific model information.

Chapter 2.Important service information 23

24 T480 Hardware Maintenance Manual

Chapter 3. General checkout

This chapter introduces following information:

• “What to do first” on page 25

• “Checkout guide” on page 26

– “Diagnosing problems” on page 26

– “Quick test programs” on page 27

– “UEFI diagnostic program” on page 27

– “Bootable diagnostic programs” on page 27

• “Power system checkout” on page 28

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

Important notes:

• Only certified trained personnel should service the computer.

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

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

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

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

drive, data or programs might be overwritten.

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

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

support.lenovo.com/partslookup

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

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

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

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

not replace the FRU.

• Be careful not to replace a nondefective FRU.

What to do first

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

form that you attach to it:

1. Name and phone number of service technician

2. Date of service

3. Date on which the machine failed

4. Date of purchase

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

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

7. Failing FRU name and part number

8. Machine type, model number, and serial number

9. Customer's name and address

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

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

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

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

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

by referring to the following list:

The following are not covered under warranty:

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

• Scratched (cosmetic) parts

• Distortion, deformation, or discoloration of the cosmetic parts

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

• Damage caused by liquid spilled into the system

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

incompatible card

• Improper disc insertion or use of an external optical drive

• Fuses blown by attachment of a nonsupported device

• Forgotten computer password (making the computer unusable)

• Sticky keys caused by spilling a liquid onto the keyboard

• Use of an incorrect ac power adapter on laptop products

The following symptoms might indicate damage caused by nonwarranted activities:

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

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

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

Checkout guide

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

computers.

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

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

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

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

operation.

Diagnosing problems

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

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

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

that come with the operating system or program. ThinkPad notebook computers come with a set of

diagnostic programs that you can use to help you identify hardware problems.

Diagnosing problems with Lenovo Companion on the Windows 10 operating system

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

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

support representative.

Lenovo Companion 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.

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:

26 T480 Hardware Maintenance Manual

https://support.lenovo.com

For additional information, see the Lenovo Companion help system.

Quick test programs

Lenovo provides quick test programs to troubleshoot and resolve computer problems.

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

on the Web site.

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

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

2. Double-click the lsc_lite.exe file.

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

4. Select the device class to be tested.

5. Select the devices to be tested.

6. Select the test to be performed.

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

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

UEFI diagnostic program

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

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

devices.

To run the UEFI diagnostic program, do the following:

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

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

for error code descriptions and troubleshooting hints.

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

UEFI diagnostic program is displayed.

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

The options on the main screen are as follows:

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

Tests Tools

• Quick Memory Test

• Quick Storage Device Test

• LCD test

• PCI-e test

• Exit Application

• System Information

• Generate configuration file

• Execute from configuration file

• Recover Bad Sectors Tool*

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

Bootable diagnostic programs

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

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

Chapter 3.General checkout 27

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

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

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

To create a bootable diagnostic medium, do the following:

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

2. Click Lenovo Bootable Diagnostics.

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

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

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

1. Attach the USB device to the computer.

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

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

page 35 for error code descriptions and troubleshooting hints.

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

window opens, release the F12 key.

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

launched automatically.

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

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

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

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

page 35 for error code descriptions and troubleshooting hints.

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

3. Restart the computer.

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

window opens, release the F12 key.

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

be launched automatically.

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

Power system checkout

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

1. Turn off the computer.

2. 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 the appropriate one of the following power supply checkouts:

• “Checking the ac power adapter” on page 29

• “Checking the removable battery and the operational charging” on page 29

• “Checking the coin-cell battery” on page 30

28 T480 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 removable battery and the

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 Companion 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 removable battery and the operational charging

Checking the removable battery

This system 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.

Note: If the removable battery becomes hot, it may not be able to charge. Remove it from the computer and

leave it at room temperature for a while. After it cools down, reinstall and recharge it.

To check the removable battery, do the following:

1. Turn off the computer.

2. Remove the removable battery and measure the voltage between battery terminals 1 (+) and 7 (-). See

the following figure:

Chapter 3.General checkout 29

1(+) 2(+) 3456(-)7(-)

Terminal Voltage (V dc)

1, 2 + 0 to + 12.6

6, 7 Ground (-)

3. If the voltage is less than +11.0 V dc, the removable battery has been discharged.

If the voltage is still less than +11.0 V dc after recharging, replace the removable battery.

4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The

resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the removable battery. If the

resistance is correct, replace the system board.

Checking the operational charging

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

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

1. Disable the built-in battery. See “Disabling the built-in battery” on page 64.

2. Remove the coin-cell battery. See “1100 Coin-cell battery” on page 77.

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

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 T480 Hardware Maintenance Manual

Chapter 4. Related service information

This chapter presents following information:

• “Passwords” on page 33

• “Power management” on page 35

• “Symptom-to-FRU index” on page 35

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

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

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

The advanced startup options enable you to do the following:

• Change the firmware settings of the computer

• Change the startup settings of the Windows operating system

• Start the computer from an external device

• 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 operates independently from the Windows 10

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

system fails to start.

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

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

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.

It is recommended that you create a recovery USB drive as early as possible. If you did not create a recovery

USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one

from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to:

https://pcsupport.lenovo.com/supportphonelist

Creating a recovery USB drive

To create a recovery USB drive, you need a USB drive with at least 16 GB of storage capacity. The actual

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

Attention: The creation process will delete 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) to the computer.

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 instructions on the screen to create a recovery USB drive.

Using the recovery USB drive

If you still 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 during the following process.

1. Connect the recovery USB drive to the computer.

2. Turn on or restart the computer. Before the Windows operating system starts, repeatedly press F12. 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 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 T480 Hardware Maintenance Manual

Passwords

As many as three passwords may be needed for any 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 powered on by an unauthorized person. The

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

power-on password, see “How to remove the power-on password” on page 34.

Hard disk password

There are two kinds of hard disk passwords:

• User hard disk password - for the user

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

even if the user has changed the user hard disk password

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

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

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

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

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

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

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

be replaced for a scheduled fee.

For how to remove the hard disk password, see “How to remove the hard disk password” on page 34.

Supervisor password

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

the following security features:

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

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

ThinkPad Setup program without the password.

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

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

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

to make administration easier.

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

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

scheduled fee.

Chapter 4.Related service information 33

How to remove the power-on password

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

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

1. Turn off the computer.

2. Remove the removable battery. For instructions on how to remove the removable battery, see “1010

Removable battery” on page 64.

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

battery” on page 79.

4. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see “1100 Coin-

cell battery” on page 77. Wait for a few seconds.

5. Reinstall the coin-cell battery. For instructions on how to install the coin-cell battery, see “1100 Coin-cell

battery” on page 77.

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

battery” on page 79.

7. Reinstall the removable battery. For instructions on how to install the removable battery, see “1010

Removable battery” on page 64.

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

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

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

power-on password:

1. Turn on the computer.

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

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

4. Select Security.

5. Select Password.

6. Select Power-On Password.

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

Password field blank, and press Enter twice.

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

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

How to remove the hard disk password

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

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

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

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

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

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

hard disk password are known, do the following:

1. Turn on the computer.

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

3. Select Security.

4. Select Password.

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

6. Select Master hard disk password.

34 T480 Hardware Maintenance Manual

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.

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

master hard disk password have been removed.

Power management

To reduce power consumption, the computer has three power management modes: screen blank, sleep, and

hibernation.

Sleep mode

When the computer enters sleep mode, the following events occur in addition to what occurs in screen blank

mode:

• The LCD is powered off.

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

• The microprocessor stops.

To put your computer into sleep mode, press Fn+4 or open the Start menu, click Power, and then click

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

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

• After a period of inactivity specified in power plan settings

• When the battery power is low

Hibernation mode

In hibernation mode, the following occurs:

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

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

• The system is powered off.

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

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

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

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

mode, perform that action.

• Closing the lid.

• Pressing the power button.

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

plan settings.

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

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

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

Symptom-to-FRU index

This section contains following information:

• “Numeric error codes” on page 36

Chapter 4.Related service information 35

• “Error messages” on page 37

• “Beep errors” on page 38

• “No-beep symptoms” on page 40

• “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

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

Replace the system board.

0188

Invalid RFID Serialization Information Area.

Replace the system board.

0189

Invalid RFID configuration information area—The

EEPROM checksum is not correct.

Replace the system board.

0190

Critical low-battery error

1. Charge the battery pack.

2. Replace the battery pack.

0191

System Security—Invalid Remote Change requested.

1. Run the ThinkPad Setup program, and then save

current setting by pressing F10.

2. Replace the system board.

0199

System Security— Security password retry count

exceeded.

1. Run the ThinkPad Setup program. The retry count

will be reset. Then save the current settings by

pressing F10.

2. Replace the system board.

36 T480 Hardware Maintenance Manual

Table 2. Numeric error codes (continued)

Symptom or error FRU or action, in sequence

0270

Real Time Clock Error— System Real Time Clock is not

functional.

Have the computer serviced.

0271

Check Date and Time settings— Neither the date nor the

time is set in the computer.

Set the date and time, using ThinkPad Setup.

1802

Unauthorized network card is plugged in—Turn off and

remove the network card.

1. Remove network card.

2. Replace the system board.

1820

More than one external fingerprint reader is attached.

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

within your main operating system.

Remove all but the reader that you set up for the

authentication.

2100

Detection error on Storage Device (Main HDD)

1. Reseat the solid-state drive.

2. Replace the solid-state drive.

3. Replace the system board.

2101

Detection error on Storage Device (M.2)

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

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

3. Replace the system board.

2102

Detection error on Storage Device (Main HDD)

1. Reseat the hard disk drive or the solid-state drive.

2. Replace the hard disk drive or the solid-state drive.

3. Replace the system board.

2110

Read error on Storage Device (Main HDD)

1. Reseat the hard disk drive.

2. Replace the hard disk drive.

3. Replace the system board.

2111

Read error on Storage Device (Main HDD)

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

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

3. Replace the system board.

2112

Read error on Storage Device (Main HDD)

1. Reseat the hard disk drive or the solid-state drive.

2. Replace the hard disk drive or the solid-state drive.

3. Replace the system board.

2200

Machine Type and Serial Number are invalid.

Replace the system board.

2201

Machine UUID is invalid

Replace the system board.

Error messages

Table 3. Error messages

Symptom or error FRU or action, in sequence

Fan error. 1. Replace the thermal fan assembly.

2. Apply thermal grease.

3. Replace the system board.

Thermal sensing error. Replace the system board.

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 pack.

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 pack.

Bottom cover tamper detection error System board

The non-volatile system UEFI variable storage is nearly

full.

Note: This error indicates that the operating system or

programs cannot create, modify, or delete data in the

non-volatile system UEFI variable storage due to

insufficient storage space after POST.

The non-volatile system UEFI variable storage is used by

the UEFI BIOS and by the operating system or programs.

This error occurs when the operating system or programs

store large amounts of data in the variable storage. All

data needed for POST, such as BIOS setup settings,

chipset, or platform configuration data, are stored in a

separate UEFI variable storage.

Press F1 after the error message is displayed to enter

ThinkPad Setup. A dialog asks the user for confirmation

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

that were created by the operating system or programs

will be deleted except global variables defined by the

Unified Extensible Firmware Interface Specification. If the

user selects “No”, all data will be kept, but the operating

system or programs will not be able to create, modify, or

delete data in the storage.

If this error happens at a service center, Lenovo

authorized service personnel will clean up the non-volatile

system UEFI variable storage using the preceding

solution.

Beep errors

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

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

technology, do the following:

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

38 T480 Hardware Maintenance Manual

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

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

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

and shows possible solutions on the smartphone.

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

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

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

Error codes Solutions

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

adapter, removable battery, and coin-cell battery).

If your computer has a built-in battery, reset the

computer by inserting a straightened paper clip

into the emergency-reset hole. Wait for one

minute. Then reconnect all power resources.

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).

Chapter 4.Related service information 39

Error codes Solutions

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

(service provider only).

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

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

board side and the computer display side (service

provider only).

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

No-beep symptoms

Table 4. No-beep symptoms

Symptom or error FRU or action, in sequence

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

POST.

1. Ensure that every connector is connected tightly

and correctly.

2. Reseat memory module.

3. Replace the system board.

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

POST. 1. Reseat memory module.

2. Replace the system board.

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

Type the password and press Enter.

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

press Enter.

LCD-related symptoms

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

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

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

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

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

Notes:

• This policy applies to all ThinkPad 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.

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.

Replace the system board.

• LCD backlight not working.

• LCD too dark.

• LCD brightness cannot be adjusted.

• LCD contrast cannot be adjusted.

1. Reseat the LCD cable.

2. Replace the LCD unit.

3. Replace the system board.

40 T480 Hardware Maintenance Manual

Table 5. LCD-related symptoms (continued)

Symptom or error FRU or action, in sequence

• LCD screen unreadable.

• Characters missing pixels.

• Screen abnormal.

• Wrong color displayed.

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

2. Reseat all LCD cable.

3. Replace the LCD unit.

4. Replace the system board.

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

Intermittent problems

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

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

considered only when a problem recurs.

When analyzing an intermittent problem, do the following:

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

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

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

errors exist.

Undetermined problems

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

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

that have no defects).

Verify that all attached devices are supported by the computer.

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

checkout” on page 28.

1. Turn off the computer.

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

3. Remove or disconnect all of the following devices:

a. Non-ThinkPad devices

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

c. Printer, mouse, and other external devices

d. Battery

e. Hard disk drive or 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 unit

Chapter 4.Related service information 41

42 T480 Hardware Maintenance Manual

Chapter 5. Status indicators

This topic provides information about locating and identifying the various status indicators on your computer.

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

1 Camera status indicator

When this indicator is on, the camera is in use.

2 8 System status indicators

The indicator in the ThinkPad logo on the computer lid and the indicator in the power button show the

system status of your computer.

• Blinks for three times: The computer is initially connected to power.

• On: The computer is on (in normal mode).

• Off: The computer is off or in hibernation mode.

• Blinks quickly: The computer is entering sleep or hibernation mode.

• Blinks slowly: The computer is in sleep mode.

3 Fingerprint reader indicator

This indicator shows the status of fingerprint reader.

• 1 Off: The fingerprint reader is not ready for tapping.

• 2 White: The fingerprint reader is ready for tapping.

• 3 Amber, blinking: The fingerprint cannot be authenticated.

4 Caps Lock indicator

When this indicator is on, you can type uppercase letters by directly pressing the letter keys.

5 Fn Lock indicator

This indicator shows the status of Fn Lock function. For more information, see Chapter 6 “Using the special

keys” on page 45.

6 Speaker-mute indicator

When this indicator is on, the speakers are muted.

7 Microphone-mute indicator

When this indicator is on, the microphones are muted.

9 ac power status indicator

This indicator shows the ac power and charging status of the computer.

• White: connected to ac power (battery power 90%–100%)

• Amber: connected to ac power (battery power 0%–90%)

• Off: not connected to ac power

44 T480 Hardware Maintenance Manual

Chapter 6. Using the special keys

Your computer has several special keys to help you work more easily and effectively.

1 Windows logo key

Press the Windows logo key to open the Start menu. For information about using the Windows logo key with

other keys, see the help information system of the Windows operating system.

2 3 Fn key and function keys

You can configure the Fn key and function keys in the Keyboard Properties window by doing the following:

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

icons.

2. Click Lenovo - Keyboard Manager and the Keyboard Manager window is displayed.

3. Select the options of your preference.

• + Switch the key function between the standard F1–F12 function and the special function

printed as an icon on each key. When the Fn Lock indicator is off, you can use the default function. You

can change the default function in the Keyboard Properties window.

• Mute or unmute the speakers. When the speakers are muted, the indicator on the key is on.

If you mute the sound and turn off your computer, the sound will remain muted when you turn on your

computer. To turn on the sound, press or .

• Decrease the speaker volume.

• Increase the speaker volume.

• Mute or unmute the microphones. When the microphones are muted, the indicator on the key is on.

• 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. If no function is defined, press this key to open the Cortana

personal assistant. To define or change the function, do the following:

1. Open the Start menu and click the Lenovo Companion program.

2. Click Hardware Settings and then click the input icon .

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

complete the setting.

On the Input page, you can also define different functions for the key combinations with F12, such as Shift

+F12, Alt+F12, or Ctrl+F12.

Key combinations

• + Open the Snipping Tool program.

• Fn+B: The Break key

• Fn+K: The ScrLK or Scroll Lock key

• Fn+P: The Pause key

• Fn+S: The SysRq key

• Fn+Left Arrow key: The Home key

• Fn+Right Arrow key: The End key

• Fn+4: Put the computer into sleep mode. To wake up the computer, press the Fn key or the power button.

• Fn+Spacebar: If your computer supports keyboard backlight, press Fn+Spacebar to switch between the

different keyboard backlight status.

46 T480 Hardware Maintenance Manual

Chapter 7. Locations

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

Locating computer controls, connectors, and indicators

This topic introduces the locations of the computer controls, connectors, and indicators.

Note: * Available on some models.

Front view

1 Infrared camera * 2 Microphones

3 Conventional camera * 4 Conventional camera with ThinkShutter (len cover) *

5 Power button 6 Fingerprint reader *

7 TrackPoint buttons 8 Trackpad

9 TrackPoint® pointing stick 10 NFC mark*

11 Screen (multi-touch screen on some models)

Left-side view

1 USB-C™ connector 2 USB-C connector (Thunderbolt™ 3 compatible)

3 Connector cover 4 Docking-station connector

5 Fan louvers 6 Smart-card slot *

Right-side view

1 Audio connector 2 USB 3.1 connector Gen 1

3 HDMI™ connector 4 Always On USB 3.1 connector Gen 1

5 Ethernet connector 6 Media-card slot

7 Security-lock slot

48 T480 Hardware Maintenance Manual

Bottom view

1 Removable battery 2 Latches

3 Docking-station hook holes 4 Fan louvers

5 Keyboard drainage holes 6 Speakers

7 Emergency-reset hole 8 Nano-SIM card slot *

Locating FRUs and CRUs

This topic introduces the following service parts:

• “Major FRUs and CRUs” on page 51

• “LCD FRUs” on page 53

• “Connector and cable guide” on page 54

Chapter 7.Locations 49

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. Follow the on-screen instructions to find the

manual for your product. You might be required to return the defective part that is replaced by the CRU. When

return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the

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

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

documentation for full details.

ThinkPad computers contain the following types of CRUs and FRU:

– 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.

50 T480 Hardware Maintenance Manual

Major FRUs and CRUs

Table 6. Major FRUs

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

1LCD unit No No

2 Trackpad cable No No

3 Trackpad No No

4 Keyboard bezel assembly No No

5 Power button board and cable No No

Chapter 7.Locations 51

Table 6. Major FRUs (continued)

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

6Fingerprint-reader bracket (on some models) No No

7Fingerprint-reader card (on some models) No No

8Wireless-LAN/Bluetooth card No Yes

9Wireless-WAN card/M.2 solid-state drive (on some

models)

No Yes

10 Hard disk drive and hard disk drive bracket Yes No

11 M.2 solid-state drive and M.2 solid-state drive adapter (on

some models)

Yes No

12 Internal storage drive cable Yes No

13 RJ45 bracket No No

14 Removable battery Yes No

15 Nano-SIM card (on some models) Yes No

16 Base cover assembly Yes No

17 Built-in battery No No

18 Speaker assembly No No

19 Thermal fan assembly No No

20 System board No No

21 Coin-cell battery Yes No

22 Memory modules No Yes

23 Smart card reader and cable (on some models) No No

24 NFC antenna (on some models) No No

25 NFC module (on some models) No No

26 NFC cable (on some models) No No

27 I/O bracket No No

28 Keyboard No Yes

29 TrackPoint cap Yes No

aMiscellaneous parts kits No No

b Power cord Yes No

cac power adapter Yes No

d Lenovo factory recovery USB key*Yes No

52 T480 Hardware Maintenance Manual

LCD FRUs

Table 7. LCD FRUs

N-

FRU descriptions Self-service

CRU

Optional-service

CRU

1LCD-bezel sheet No No

2Camera shutter (available on some models) No No

3LCD panel No No

4LCD cable No No

5Camera/LED cable No No

6Conventional camera/microphone module (on some models) No No

7Infrared camera/microphone module (on some models) No No

8Wireless-LAN antenna and wireless-WAN antenna (on some models) No No

9LCD rear-cover support bracket assembly No No

Chapter 7.Locations 53

Table 7. LCD FRUs (continued)

N-

FRU descriptions Self-service

CRU

Optional-service

CRU

10 LCD hinge assembly No No

11 LCD rear-cover assembly No No

Miscellaneous parts

Table 8. Miscellaneous parts

FRU descriptions Self-service

CRU

Optional-service

CRU

Screw kit

• Screw, M2*L3, black (20)

• Screw, M2.0*L4.6, black (10)

• Screw, M2.5*4, black (10)

• Screw, M2*L3.5, silver (10)

• Screw, M2.5*2.5, silver (10)

• Screw, M2.0*2.5, silver (10)

• Screw, M2*L4, black (10)

• Screw, M2 * L2.8, black (10)

No No

System miscellaneous parts kit

• IO bracket

• RJ45 bracket

• Speaker rubbers

• Sheet support rubber

• Microphone rubbers

• NFC ferrite sheet

• NFC sponge

• Smartcard safety mylar

• Tape for WWAN antenna fix

• Thermal pad for SSD in WWAN slot

• Mylar for DIMM slot

• Mylar for WWAN connector

• Absorber for WWAN slot

• Absorber for DIMM slot

• Cap for docking-station connector

• Docking-station rubber

No No

GEO label assembly No No

Connector and cable guide

This section provides information for Lenovo authorized service technicians to help 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 51 and “LCD FRUs” on page 53.

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

54 T480 Hardware Maintenance Manual

System board connectors and cables

Table 9. System board

Ite-

Connector (location) Internal cable required Cable connection

1Camera/LED connector

(internal)

Camera/LED cable The camera/LED cable comes with the camera/

microphone combo card. See “Camera/microphone

combo card connector and cable” on page 56.

2Power-button-card

connector (internall)

Power-button-card cable The power-button-card cable comes with the power-

button card. Connect the cable to this connector.

3Removable battery

connector (external)

No Connect the removable battery to this connector.

4Nano-SIM-card slot

(external)

No Insert the nano-SIM card into this slot.

5Coin-cell battery

connector (internal)

Coin-cell battery cable The coin-cell battery comes with cable. Connect the

cable to this connector.

6LCD connector (internal) LCD cable Connect one end to the LCD panel and the other end to

this connector.

7USB-C connector

(external)

No Connect USB-C-compatible devices or a USB-C power

adapterto this connector.

8USB-C connector

(Thunderbolt 3

compatible)

No Connect USB-C compatible devices to this connector.

9Ethernet extension

connector Gen 2

(external)

No Connect ThinkPad Ethernet Extension Adapter Gen 2

to attach an Ethernet cable.

Chapter 7.Locations 55

Table 9. System board (continued)

Ite-

Connector (location) Internal cable required Cable connection

10 Thermal fan connector

(internal)

Thermal fan cable The thermal fan cable comes with the thermal fan.

Connect the cable to this connector.

11 Built-in battery

connector (internal)

Built-in battery cable The built-in battery cable comes with the cable.

Connect the cable to this connector.

12 NFC connector (internal) NFC cable The NFC cable comes with the NFC module. Connect

the cable to this connector.

13 Smart-card-reader

connector (internal)

Smart-card-reader cable The smart-card-reader cable comes with the smart

card reader. Connect the cable to this connector.

14 Memory module slot

(internal)

No Insert the memory module into this slot.

15 Internal storage drive

connector (internal)

Internal storage drive

cable

The internal storage drive cable comes with the internal

storage drive. Connect the cable to this connector.

16 Fingerprint reader

connector (internal)

Fingerprint reader cable Connect one end to the fingerprint reader and the other

end to this connector.

17 Trackpad connector

(internal)

Trackpad cable Connect the Trackpad cable to this connector.

18 Speaker connector

(internal)

Speaker assembly cable The speaker assembly comes with cable. Connect the

cable to this connector.

19 Wireless-WAN card slot

(internal)

No Insert the wireless-WAN card into this slot.

20 Audio connector

(external)

No Connect headphones or a headset with 3.5-mm (0.14-

inch) 4-pole plug to this connector.

21 USB 3.1 connector Gen

1 (external)

No Connect USB-compatible devices to this connector.

22 HDMI connector

(external)

No Connect a compatible digital audio device or video

monitor to this connector.

23 Wireless-LAN card slot

(internal)

No Insert the wireless-LAN card into this slot.

24 Always on USB 3.1

connector Gen 1

No Connect USB-compatible devices to this connector.

25 Ethernet connector

(external)

No Connect the computer to a local area network (LAN)

with the Ethernet connector.

26 Media-card slot (internal) No Insert a flash media card into the media-card slot for

data access or storage.

27 Keyboard connector

(internal)

Keyboard cable Connect the keyboard cable to this connector.

28 Trackpoint connector

(internal)

Trackpoint cable Connect the trackpoint cable to this connector.

Camera/microphone combo card connector and cable

56 T480 Hardware Maintenance Manual

Table 10. Camera/microphone combo card

It-

Connector (location) Internal cable required Cable connection

1Camera/microphone card

connector (internal)

Camera/LED cable Connect the end c of the cable to the camera/LED

connector on the system board, and connect the end

b of the cable to the LCD rear cover. Then, connect

the end a of the cable to this connector.

NFC module and cable

Table 11. NFC module

It-

Connector (location) Internal cable required Cable connection

1NFC module connector

(internal)

NFC module cable Connect one end to the NFC module connector on the

system board and the other end to this connector.

2NFC antenna connector

(internal)

NFC antenna cable Connect the NFC antenna cable to this connector.

TrackPad connector and cable

Chapter 7.Locations 57

Table 12. TrackPad connector

It-

Connector (location) Internal cable required Cable connection

1Trackpad connector

(internal)

Trackpad cable Connect one end to the trackpad connector on the

system board and the other end to this connector.

Looking up FRU information

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

https://support.lenovo.com/partslookup

58 T480 Hardware Maintenance Manual

Chapter 8. FRU replacement notices

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

replacing any FRU.

CRU statement for customers:

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

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

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

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

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

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

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

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

the on-screen instructions to find the manual for your product. You might be required to return the defective

part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label,

and a container will be included with the replacement CRU; and (2) you might be charged for the

replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the

replacement CRU. See your Lenovo Limited Warranty documentation for full details.

Screw notices

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

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

• They maintain tight connections.

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

• They are harder to tighten.

Do the following when you service this machine:

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

partslookup.

• It is recommended to use new screws.

• It is recommended to use each screw only once.

Tighten screws as follows:

• Plastic to plastic

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

• Logic card to plastic

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

Notes:

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

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

for each step.

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

Retaining serial numbers

This topic provides instructions on the following:

• “Restoring the serial number of the system unit” on page 60

• “Retaining the UUID” on page 61

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 follow:

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.

60 T480 Hardware Maintenance Manual

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

displayed.

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

Asset ID screen is displayed.

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

restore the serial number of the system unit.

Retaining the UUID

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

production and stored in the EEPROM of your system board.

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

computers in the world have the same number.

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

if the system board does not have a UUID:

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 box build date, select 5. Read box build date from EEPROM, and

follow the instructions on the screen.

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

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

Key to update the EEPROM.

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

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

Chapter 8.FRU replacement notices 61

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

then restart the computer.

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

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

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

instruction on the screen.

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

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

62 T480 Hardware Maintenance Manual

Chapter 9. Removing or replacing a FRU

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

CRU statement for customers:

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

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