About this manual
Chapter 1. Safety information
Chapter 2. General checkout
- What to do first
- CRU list
Chapter 3. Identifying FRUs (CRUs)
- Locate FRUs and CRUs
Chapter 4. Removing a FRU or CRU
Appendix A. Label locations
Trademarks

Lenovo 15 User Manual

Displayed below is the user manual for 15 by Lenovo which is a product in the Notebooks category. This manual has pages.

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Hardware Maintenance Manual

Lenovo ThinkBook 14 Gen 3 and Lenovo ThinkBook 15 Gen 3

First Edition (March 2021)

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. General checkout . . . . . 21

What to do first . . . . . . . . . . . . . . . 21

CRU list . . . . . . . . . . . . . . . . . . 22

Chapter 3. Identifying FRUs

(CRUs) . . . . . . . . . . . . . . . . . 23

Locate FRUs and CRUs . . . . . . . . . . . 23

Chapter 4. Removing a FRU or

CRU . . . . . . . . . . . . . . . . . . 31

Service tools . . . . . . . . . . . . . . . . 31

General guidelines. . . . . . . . . . . . . . 31

Removal procedure for ThinkBook 14 G3 ACL . . . 32

Remove the lower case . . . . . . . . . . 32

Remove the battery pack . . . . . . . . . 33

Remove the 2242 solid-state drive (SSD) . . . 34

Remove the 2280 solid-state drive (SSD) . . . 34

Remove the 2nd solid-state drive (SSD) . . . . 35

Remove the 2nd solid-state drive (SSD)

bracket . . . . . . . . . . . . . . . . 36

Remove the hard disk drive (HDD) . . . . . . 37

Remove the Wi-Fi card . . . . . . . . . . 38

Remove the heat sink. . . . . . . . . . . 39

Remove the fan . . . . . . . . . . . . . 40

Remove the memory module . . . . . . . . 40

Remove the CMOS battery . . . . . . . . 41

Remove the I/O bracket (left) . . . . . . . . 42

Remove the I/O bracket (right) . . . . . . . 43

Remove the I/O board with cable . . . . . . 43

Remove the power board with cable . . . . . 45

Remove the fingerprint board with cable . . . 46

Remove the lens light guide . . . . . . . . 47

Remove the speakers. . . . . . . . . . . 48

Remove the system board . . . . . . . . . 48

Remove the LCD module . . . . . . . . . 50

Remove the upper case (with keyboard and

touchpad) . . . . . . . . . . . . . . . 51

Disassemble the LCD module . . . . . . . 52

Removal procedure for ThinkBook 15 G3 ACL . . . 59

Remove the lower case . . . . . . . . . . 59

Remove the battery pack . . . . . . . . . 60

Remove the 2242 solid-state drive (SSD) . . . 60

Remove the 2280 solid-state drive (SSD) . . . 61

Remove the 2nd solid-state drive (SSD) . . . . 62

Remove the 2nd solid-state drive (SSD)

bracket . . . . . . . . . . . . . . . . 63

Remove the hard disk drive (HDD) . . . . . . 63

Remove the Wi-Fi card . . . . . . . . . . 64

Remove the heat sink. . . . . . . . . . . 65

Remove the fan . . . . . . . . . . . . . 66

Remove the memory module . . . . . . . . 67

Remove the CMOS battery . . . . . . . . 68

Remove the I/O bracket (left) . . . . . . . . 69

Remove the I/O bracket (right) . . . . . . . 70

Remove the I/O board with cable . . . . . . 70

Remove the power board with cable . . . . . 72

Remove the fingerprint board with cable . . . 73

Remove the lens light guide . . . . . . . . 74

Remove the speakers. . . . . . . . . . . 74

Remove the system board . . . . . . . . . 75

Remove the LCD module . . . . . . . . . 77

Remove the upper case (with keyboard and

touchpad) . . . . . . . . . . . . . . . 78

Disassemble the LCD module . . . . . . . 79

Appendix A. Label locations. . . . . . 87

Trademarks . . . . . . . . . . . . . . . . xci

ii Hardware Maintenance Manual

About this manual

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

Machine Machine type (MT)

ThinkBook 14 G3 ACL 21A2

ThinkBook 15 G3 ACL 21A4

Important:

• This manual is intended only for trained service technicians who are familiar with Lenovo products.

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

information” on page 1.

iv Hardware Maintenance Manual

Chapter 1. Safety information

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

Lenovo notebook computer.

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 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. 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 non-conductive 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,

non-grounded 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-Lenovo 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 cathode ray tube (CRT) face or a bulging capacitor

• Mechanical hazards, such as loose or missing hardware

2Hardware Maintenance Manual

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: http://

www.lenovo.com/serviceparts-lookup

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-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo

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.

– 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.

Chapter 1.Safety information 3

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

4Hardware Maintenance Manual

DANGER

Chapter 1.Safety information 5

6Hardware Maintenance Manual

PERIGO

Chapter 1.Safety information 7

PERIGO

8Hardware Maintenance Manual

DANGER

Chapter 1.Safety information 9

DANGER

VORSICHT

10 Hardware Maintenance Manual

VORSICHT

Chapter 1.Safety information 11

VORSICHT

12 Hardware Maintenance Manual

Chapter 1.Safety information 13

14 Hardware Maintenance Manual

Chapter 1.Safety information 15

16 Hardware Maintenance Manual

Chapter 1.Safety information 17

18 Hardware Maintenance Manual

Chapter 1.Safety information 19

20 Hardware Maintenance Manual

Chapter 2. General checkout

This chapter contains the following topics:

Before you go to the checkout instructions, ensure that you 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.

• 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 an FRU only with another FRU of the correct model. When you replace an FRU, make sure that the

model of the machine and the FRU part number are correct by referring to the FRU parts list.

• An 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 an FRU only when a problem recurs. If you suspect that an 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 an 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 non-supported 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 non-warranted 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.

CRU list

Table 1. Model: ThinkBook 14 G3 ACL (MT: 21A2)

CRU Type

ac power adapter self-service

Power cord * self-service

Table 2. Model: ThinkBook 15 G3 ACL (MT: 21A4)

CRU Type

ac power adapter self-service

Power cord * self-service

* for selected models

22 Hardware Maintenance Manual

Chapter 3. Identifying FRUs (CRUs)

Locate FRUs and CRUs

The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to

replace when servicing a customer’s computer.

Figure 1. ThinkBook 14 G3 ACL exploded view

Table 3. FRU (CRU) categories

No. FRU (CRU) category

1Upper case (with keyboard and touchpad)

24 Hardware Maintenance Manual

Table 3. FRU (CRU) categories (continued)

2Lens light guide

3Fingerprint board with cable

4Power board with cable

5CMOS battery

6Heat sink

7Fan

8System board

9I/O board with cable

10 I/O bracket (right)

11 Hard disk drive (HDD) cable

12 Hard disk drive (HDD)

13 Hard disk drive (HDD) bracket

14 Battery pack

15 Speakers

16 Lower case

17 Memory module shielding

18 Memory module

19 Solid-state drive (SSD) bracket

Note: The SSD bracket is used to lock the screw for the 2280 SSD.

20 2nd Solid-state drive (SSD)

21 2280 Solid-state drive (SSD)

22 2242 Solid-state drive (SSD)

23 Solid-state drive (SSD) bracket

Note: The SSD bracket is used to lock the screw for the 2242 SSD.

24 I/O bracket (left)

25 Mylar

26 Wi-Fi card

aPower cord *

bac power adapter

cScrew kit

* for selected models

Chapter 3.Identifying FRUs (CRUs) 25

Figure 2. ThinkBook 14 G3 ACL LCD unit - exploded view

Table 4. FRU categories for the LCD unit

No. FRU (CRU) category

1Microphone rubbers

2Camera

3LCD bezel

4Hinge cover

5Hinges

6LCD panel

7Removable tape

8LCD cover

9EDP cable

26 Hardware Maintenance Manual

Figure 3. ThinkBook 15 G3 ACL exploded view

Chapter 3.Identifying FRUs (CRUs) 27

Table 5. FRU (CRU) categories

No. FRU (CRU) category

1Upper case (with keyboard and touchpad)

2Lens light guide

3Fingerprint board with cable

4Power board with cable

5Heat sink

6Fan

7System board

8I/O board with cable

9I/O bracket (right)

10 CMOS battery

11 Hard disk drive (HDD) cable

12 Hard disk drive (HDD)

13 Hard disk drive (HDD) bracket

14 Battery pack

15 Speakers

16 Lower case

17 Solid-state drive (SSD) bracket

Note: The SSD bracket is used to lock the screw for the 2280 SSD.

18 2nd solid-state drive (SSD)

19 SSD Thermalpad

20 2280 Solid-state drive (SSD)

21 2242 Solid-state drive (SSD)

22 Solid-state drive (SSD) bracket

Note: The SSD bracket is used to lock the screw for the 2242 SSD.

23 Memory module shielding

24 Memory module

25 I/O bracket (left)

26 Mylar

27 Wi-Fi card

aPower cord *

bac power adapter

cScrew kit

* for selected models

28 Hardware Maintenance Manual

Figure 4. ThinkBook 15 G3 ACL LCD unit — exploded view

Table 6. FRU categories for the LCD unit

No. FRU (CRU) category

1Microphone rubbers

2Camera

3LCD bezel

4Hinge cover

5Hinges

6LCD panel

7Removable tape

Chapter 3.Identifying FRUs (CRUs) 29

Table 6. FRU categories for the LCD unit (continued)

8LCD cover

9EDP cable

30 Hardware Maintenance Manual

Chapter 4. Removing a FRU or CRU

Service tools

The following table lists tools for servicing Lenovo computers. Tools with a cross mark are needed for serving

the product models as described by this publication. Prepare them before you service the product.

Table 7. Service tools

Service tool and consumable Model applicability

Screw driver (Phillips head) (PH1/PH0) X

Screw driver (Torx head) (T5)

Screw driver (Torx head) (T30)

Pry tool 1 X

Tweezers (conductive) X

Tweezers (isolated)

Suction cup

Hexagonal socket

Silicone grease

Acetate tape X

Polyamide tape

Mylar tape

Electrical tape

Double-sided tape

Conductive tape

Eraser

Heat gun

Brown brush

Notes:

• T30 screw drivers are used to service the new Intel Xeon CPUs.

• Hexagonal sockets are used to remove antenna connectors.

• Silicone grease is applied to the CPU and heatsink surfaces to eliminate air gaps.

General guidelines

When removing or replacing an FRU, ensure that you 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. 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 procedure. Remove them in the order in which they

are listed.

3. Follow the correct sequence in the steps for removing an FRU, as shown in the illustrations by the

numbers in square callouts.

4. When removing an FRU, move it in the direction as shown by the arrow in the illustration.

5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that

pertain to replacement.

6. When replacing an FRU, carefully retain and reuse all screws.

7. When replacing the base cover, reapply all labels that come with the replacement base cover. If some

original labels are not included with the replacement base cover, peel them off from the original base

cover and paste them on the replacement base cover.

DANGER

Before removing any FRU or CRU, shut down the computer and unplug all power cords from

electrical outlets.

Attention: After replacing an FRU, do not turn on the computer until you have ensured 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.

Attention: 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 (P/N 6405959).

Removal procedure for ThinkBook 14 G3 ACL

Remove the lower case

Make sure the computer has been shut down before servicing the computer.

Step 1. Place the computer upside down on a flat surface.

Step 2. Loosen six screws and then remove four screws.

Figure 5. Loosen six screws and then remove four screws

Screw specifications Number of screws

M2.0 x L2.3+2.2 4

32 Hardware Maintenance Manual

Step 3. Pry up the latches and then remove the lower case.

Figure 6. Pry up the latches and remove the lower case

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Lower case

Remove the battery pack

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove four screws and then remove the battery pack.

Figure 7. Remove the battery pack

Screw specifications Number of screws

M2.0 x L4.0 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Battery pack

Chapter 4.Removing a FRU or CRU 33

Remove the 2242 solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw and then remove the 2242 SSD module.

Screw specifications Number of screws

M1.98 x L3.0 1

Step 3. Remove one screw and then separate the 2242 SSD from the SSD bracket.

Figure 8. Remove one screw and separate the 2242 SSD

Screw specifications Number of screws

M2.0 x L2.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

2242 Solid-state drive (SSD)

Solid-state drive (SSD) bracket

Remove the 2280 solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw.

34 Hardware Maintenance Manual

Figure 9. Remove one screw

Screw specifications Number of screws

M1.98 x L3.0 1

Step 3. Remove the SSD by pulling it away from the slot.

Figure 10. Remove the SSD

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2280 Solid-state drive (SSD)

Remove the 2nd solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw.

Chapter 4.Removing a FRU or CRU 35

Figure 11. Remove one screw

Screw specifications Number of screws

M1.98 x L3.0 1

Step 3. Remove the 2nd SSD by pulling it away from the slot.

Figure 12. Remove the 2nd SSD

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2nd Solid-state drive (SSD)

Remove the 2nd solid-state drive (SSD) bracket

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the 2nd solid-state drive (SSD)” on page 35

Step 1. Remove one screw and then remove the 2nd SSD bracket.

36 Hardware Maintenance Manual

Figure 13. Remove the 2nd SSD bracket

Screw specifications Number of screws

M1.98 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2nd SSD bracket

Remove the hard disk drive (HDD)

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

Step 1. Disconnect the HDD cable from the system board. Remove four screws and then remove the HDD

module.

Figure 14. Disconnect the HDD cable and remove the HDD module

Screw specifications Number of screws

M1.98 x L3.0 4

Step 2. Disconnect the HDD cable from the HDD. Remove four screws and then separate the HDD from the

HDD bracket.

Chapter 4.Removing a FRU or CRU 37

Screw specifications Number of screws

M3.0 x L3.0 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Hard disk drive (HDD)

Hard disk drive (HDD) cable

Hard disk drive (HDD) bracket

Remove the Wi-Fi card

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Peel off the mylar carefully.

Note: The mylar is not reusable. Replace it when replacing related FRUs.

Figure 15. Peel off the mylar

Step 3. Detach the main and auxiliary antenna cable connectors. Remove one screw and then remove the

Wi-Fi card by pulling it away from the slot.

38 Hardware Maintenance Manual

Figure 16. Remove the Wi-Fi card

Screw specifications Number of screws

M1.98 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Wi-Fi card

Mylar

Remove the heat sink

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove five screws and then remove the heat sink.

Figure 17. Remove the heat sink

Chapter 4.Removing a FRU or CRU 39

Screw specifications Number of screws

M2.0 x L2.0 5

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Heat sink

Remove the fan

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the fan cable from the system board. Remove two screws and then remove the fan.

Figure 18. Disconnect the fan cable and remove the fan

Screw specifications Number of screws

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Fan

Remove the memory module

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove the memory module shielding.

40 Hardware Maintenance Manual

Figure 19. Remove the memory module shielding

Step 3. Release the two latches on both edges of the socket at the same time. Then, remove the memory

module.

Figure 20. Remove the memory module

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Memory module

Memory module shielding

Remove the CMOS battery

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the CMOS battery cable from the I/O board and then remove the CMOS battery.

Chapter 4.Removing a FRU or CRU 41

Figure 21. Disconnect the CMOS battery cable and remove the CMOS battery

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

CMOS battery

Remove the I/O bracket (left)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove six screws and then remove the I/O bracket (left).

Figure 22. Remove the I/O bracket (left)

Screw specifications Number of screws

M2.0 x L4.0 6

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

42 Hardware Maintenance Manual

I/O bracket (left)

Remove the I/O bracket (right)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove two screws and then remove the I/O bracket (right).

Figure 23. Remove the I/O bracket (right)

Screw specifications Number of screws

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

I/O bracket (right)

Remove the I/O board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

“Remove the fan” on page 40

“Remove the CMOS battery” on page 41

“Remove the I/O bracket (right)” on page 43

Step 1. Remove three screws and then open the hinge.

Chapter 4.Removing a FRU or CRU 43

Figure 24. Open the hinge

Screw specifications Number of screws

M2.5 x L5.5 3

Step 2. Disconnect the I/O board cable from the system board. Then, disconnect the fingerprint board

cable and the power board cable from the I/O board.

Figure 25. Disconnect the I/O board cable, the fingerprint board cable and the power board cable

Step 3. Remove one screw and then remove the I/O board with cable.

44 Hardware Maintenance Manual

Figure 26. Remove the I/O board with cable

Screw specifications Number of screws

M2.0 x L4.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

I/O board with cable

Remove the power board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

“Remove the fan” on page 40

“Remove the CMOS battery” on page 41

“Remove the I/O bracket (right)” on page 43

“Remove the I/O board with cable” on page 43

Step 1. Peel off the tape carefully.

Chapter 4.Removing a FRU or CRU 45

Figure 27. Peel off the tape

Step 2. Remove two screws and then remove the power board with cable.

Figure 28. Remove the power board with cable

Screw specifications Number of screws

M1.6 x L2.7 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Power board with cable

Remove the fingerprint board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

46 Hardware Maintenance Manual

“Remove the battery pack” on page 33

“Remove the fan” on page 40

“Remove the CMOS battery” on page 41

“Remove the I/O bracket (right)” on page 43

“Remove the I/O board with cable” on page 43

“Remove the power board with cable” on page 45

Step 1. Remove the fingerprint board with cable.

Figure 29. Remove the fingerprint board with cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Fingerprint board with cable

Remove the lens light guide

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

“Remove the fan” on page 40

“Remove the CMOS battery” on page 41

“Remove the I/O bracket (right)” on page 43

“Remove the I/O board with cable” on page 43

“Remove the power board with cable” on page 45

“Remove the fingerprint board with cable” on page 46

Step 1. Remove the fingerprint board lens light guide.

Figure 30. Remove the fingerprint board lens light guide

Chapter 4.Removing a FRU or CRU 47

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Lens light guide

Remove the speakers

Make sure the following FRU (CRU) has been removed.

“Remove the lower case” on page 32

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the speaker cable from the system board and release the speaker cable from the cable

guide. Then, remove the speakers.

Figure 31. Remove the speakers

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Speakers

Remove the system board

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

“Remove the 2280 solid-state drive (SSD)” on page 34

“Remove the 2nd solid-state drive (SSD)” on page 35

“Remove the Wi-Fi card” on page 38

“Remove the heat sink” on page 39

“Remove the fan” on page 40

“Remove the memory module” on page 40

“Remove the I/O bracket (left)” on page 42

Step 1. Disconnect cables connected to the system board.

48 Hardware Maintenance Manual

Figure 32. Disconnect cables

Step 2. Remove one screw and then remove the system board.

Figure 33. Remove the system board

Screw specifications Number of screws

M1.98 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

System board

Use a Golden Key U1 tool to flash-write key id information

After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to

start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID

to the new system board.

The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb

drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create

and use a Goldern Key U1 tool.

Chapter 4.Removing a FRU or CRU 49

Remove the LCD module

Make sure the following FRUs (CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the heat sink” on page 39

“Remove the fan” on page 40

Step 1. Peel off the mylar carefully.

Note: The mylar is not reusable. Replace it when replacing related FRUs.

Figure 34. Peel off the mylar

Step 2. Detach the antenna cable connectors and then disconnect the EDP cable from the system board.

Figure 35. Detach the antenna cable connectors and disconnect the EDP cable

Step 3. Rotate the LCD module to an angle of more than 90 degrees and place the computer on a flat

surface as shown. Remove five screws and then remove the LCD module.

50 Hardware Maintenance Manual

Figure 36. Rotate the LCD module and remove the LCD module

Screw specifications Number of screws

M2.5 x L5.5 5

Remove the upper case (with keyboard and touchpad)

Make sure the following FRUs (CRUs) have been removed.

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

“Remove the 2242 solid-state drive (SSD)” on page 34

“Remove the 2280 solid-state drive (SSD)” on page 34

“Remove the 2nd solid-state drive (SSD)” on page 35

“Remove the 2nd solid-state drive (SSD) bracket” on page 36

“Remove the hard disk drive (HDD)” on page 37

“Remove the Wi-Fi card” on page 38

“Remove the heat sink” on page 39

“Remove the fan” on page 40

“Remove the memory module” on page 40

“Remove the CMOS battery” on page 41

“Remove the I/O bracket (left)” on page 42

“Remove the I/O bracket (right)” on page 43

“Remove the I/O board with cable” on page 43

“Remove the power board with cable” on page 45

“Remove the fingerprint board with cable” on page 46

“Remove the lens light guide” on page 47

“Remove the speakers” on page 48

“Remove the system board” on page 48

“Remove the LCD module” on page 50

Chapter 4.Removing a FRU or CRU 51

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Upper case (with keyboard and touchpad)

Disassemble the LCD module

The LCD module as a whole is not an FRU. Instead, it contains FRUs as its components. Before

disassembling the LCD module, make sure it has been detached from the upper case.

Remove the hinge cover

Make sure the following unit has been removed.

“Remove the LCD module” on page 50

Step 1. Remove the hinge cover.

Figure 37. Remove the hinge cover

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Hinge cover

Remove the LCD bezel

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

Step 1. Remove three screws.

52 Hardware Maintenance Manual

Figure 38. Remove three screws

Screw specifications Number of screws

M2.0 x L4.0 3

Step 2. Remove the LCD bezel carefully.

Note: The LCD bezel is fragile and should be replaced if damaged.

Figure 39. Remove the LCD bezel

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

LCD bezel

Remove the hinges

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

Step 1. Remove eight screws and then remove the hinges.

Chapter 4.Removing a FRU or CRU 53

Figure 40. Remove the hinges

Screw specifications Number of screws

M2.0 x L2.0 6

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Hinges

Remove the LCD panel

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

Step 1. Remove the two pieces of removable tape with tweezers.

Note: The removable tape is not reusable. Replace it when replacing related FRUs.

Figure 41. Remove the two pieces of removable tape with tweezers

Step 2. Lift the LCD panel slightly. Peel off the tape. Disconnect the EDP cable from the LCD panel and

then remove the LCD panel.

54 Hardware Maintenance Manual

Figure 42. Disconnect the EDP cable and remove the LCD panel

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

LCD panel

Removable tape

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.

Chapter 4.Removing a FRU or CRU 55

Table 8. 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” on page 55.

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.

Remove the EDP cable

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

“Remove the LCD panel” on page 54

Step 1. Disconnect the EDP cable from the camera board and then remove the EDP cable.

Figure 43. Remove the EDP cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

EDP cable

56 Hardware Maintenance Manual

Removable tape

Remove the microphone rubbers

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

“Remove the LCD panel” on page 54

Step 1. Remove the microphone rubbers.

Note: The microphone rubbers are not reusable. Replace them when replacing related FRUs.

Figure 44. Remove the microphone rubbers

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Microphone rubbers

Removable tape

Remove the camera

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

“Remove the LCD panel” on page 54

“Remove the microphone rubbers” on page 57

Step 1. Disconnect the EDP cable from the camera board and then remove the camera.

Chapter 4.Removing a FRU or CRU 57

Figure 45. Remove the camera

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Camera

Removable tape

Remove the LCD cover

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 50

“Remove the hinge cover” on page 52

“Remove the LCD bezel” on page 52

“Remove the hinges” on page 53

“Remove the LCD panel” on page 54

“Remove the EDP cable” on page 56

“Remove the microphone rubbers” on page 57

“Remove the camera” on page 57

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

LCD cover

58 Hardware Maintenance Manual

Removal procedure for ThinkBook 15 G3 ACL

Remove the lower case

Make sure the computer has been shut down before servicing the computer.

Step 1. Place the computer upside down on a flat surface.

Step 2. Loosen six screws and then remove five screws.

Figure 46. Loosen six screws and remove five screws

Screw specifications Number of screws

M2.0 x L1.5+2.0 4

M1.6 x L9.0 1

Step 3. Pry up the latches and then remove the lower case.

Figure 47. Pry up the latches and remove the lower case

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Lower case

Chapter 4.Removing a FRU or CRU 59

Remove the battery pack

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove four screws and then remove the battery pack.

Figure 48. Remove the battery pack

Screw specifications Number of screws

M2.0 x L4.0 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Battery pack

Remove the 2242 solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw and then remove the 2242 SSD module.

Screw specifications Number of screws

M2.0 x L3.0 1

Step 3. Remove one screw and then separate the 2242 SSD from the SSD bracket.

60 Hardware Maintenance Manual

Figure 49. Remove one screw and separate the 2242 SSD

Screw specifications Number of screws

M2.0 x L2.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

2242 Solid-state drive (SSD)

Solid-state drive (SSD) bracket

Remove the 2280 solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw.

Figure 50. Remove one screw

Screw specifications Number of screws

M2.0 x L3.0 1

Step 3. Remove the SSD by pulling it away from the slot.

Chapter 4.Removing a FRU or CRU 61

Figure 51. Remove the SSD

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2280 Solid-state drive (SSD)

Remove the 2nd solid-state drive (SSD)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove one screw.

Figure 52. Remove one screw

Screw specifications Number of screws

M2.0 x L2.5 1

Step 3. Remove the 2nd SSD by pulling it away from the slot.

62 Hardware Maintenance Manual

Figure 53. Remove the 2nd SSD

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2nd Solid-state drive (SSD)

Remove the 2nd solid-state drive (SSD) bracket

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the 2nd solid-state drive (SSD)” on page 62

Step 1. Remove one screw and then remove the 2nd SSD bracket.

Figure 54. Remove the 2nd SSD bracket

Screw specifications Number of screws

M2.0 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

2nd SSD bracket

Remove the hard disk drive (HDD)

Make sure the following FRUs (or CRUs) have been removed.

Chapter 4.Removing a FRU or CRU 63

“Remove the lower case” on page 32

“Remove the battery pack” on page 33

Step 1. Disconnect the HDD cable from the system board. Remove four screws and then remove the HDD

module.

Figure 55. Disconnect the HDD cable and remove the HDD module

Screw specifications Number of screws

M2.0 x L3.0 4

Step 2. Disconnect the HDD cable from the HDD. Remove four screws and then separate the HDD from the

HDD bracket.

Screw specifications Number of screws

M3.0 x L3.0 4

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Hard disk drive (HDD)

Hard disk drive (HDD) cable

Hard disk drive (HDD) bracket

Remove the Wi-Fi card

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Peel off the mylar carefully.

Note: The mylar is not reusable. Replace it when replacing related FRUs.

64 Hardware Maintenance Manual

Figure 56. Peel off the mylar

Step 3. Detach the main and auxiliary antenna cable connectors. Remove one screw and then remove the

Wi-Fi card by pulling it away from the slot.

Figure 57. Remove the Wi-Fi card

Screw specifications Number of screws

M2.0 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Wi-Fi card

Mylar

Remove the heat sink

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Chapter 4.Removing a FRU or CRU 65

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove five screws and then remove the heat sink.

Figure 58. Remove the heat sink

Screw specifications Number of screws

M2.0 x L2.0 5

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Heat sink

Remove the fan

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the fan cable from the system board and release the fan cable from the cable guide.

66 Hardware Maintenance Manual

Figure 59. Disconnect the fan cable and release the fan cable

Step 3. Remove two screws and then remove the fan.

Figure 60. Remove the fan

Screw specifications Number of screws

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Fan

Remove the memory module

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove the memory module shielding.

Chapter 4.Removing a FRU or CRU 67

Figure 61. Remove the memory module shielding

Step 3. Release the two latches on both edges of the socket at the same time. Then, remove the memory

module.

Figure 62. Remove the memory module

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Memory module

Memory module shielding

Remove the CMOS battery

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the CMOS battery cable from the I/O board and then remove the CMOS battery.

68 Hardware Maintenance Manual

Figure 63. Disconnect the CMOS battery cable and remove the CMOS battery

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

CMOS battery

Remove the I/O bracket (left)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove six screws and then remove the I/O bracket (left).

Figure 64. Remove the I/O bracket (left)

Screw specifications Number of screws

M2.0 x L4.0 6

Chapter 4.Removing a FRU or CRU 69

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

I/O bracket (left)

Remove the I/O bracket (right)

Make sure the following FRU (or CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Remove two screws and then remove the I/O bracket (right).

Figure 65. Remove the I/O bracket (right)

Screw specifications Number of screws

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

I/O bracket (right)

Remove the I/O board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the CMOS battery” on page 68

“Remove the I/O bracket (right)” on page 70

Step 1. Remove three screws and then open the hinge.

70 Hardware Maintenance Manual

Figure 66. Open the hinge

Screw specifications Number of screws

M2.5 x L5.5 3

Step 2. Disconnect the I/O board cable from the system board. Then, disconnect the fingerprint board

cable and the power board cable from the I/O board.

Figure 67. Disconnect the I/O board cable, the fingerprint board cable and the power board cable

Step 3. Remove one screw and then remove the I/O board with cable.

Chapter 4.Removing a FRU or CRU 71

Figure 68. Remove the I/O board with cable

Screw specifications Number of screws

M2.0 x L4.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

I/O board with cable

Remove the power board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the CMOS battery” on page 68

“Remove the I/O bracket (right)” on page 70

“Remove the I/O board with cable” on page 70

Step 1. Peel off the tape carefully.

Figure 69. Peel off the tape

Step 2. Remove two screws and then remove the power board with cable.

72 Hardware Maintenance Manual

Figure 70. Remove the power board with cable

Screw specifications Number of screws

M1.6 x L2.7 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Power board with cable

Remove the fingerprint board with cable

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the CMOS battery” on page 68

“Remove the I/O bracket (right)” on page 70

“Remove the I/O board with cable” on page 70

“Remove the power board with cable” on page 72

Step 1. Remove the fingerprint board with cable.

Chapter 4.Removing a FRU or CRU 73

Figure 71. Remove the fingerprint board with cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Fingerprint board with cable

Remove the lens light guide

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the CMOS battery” on page 68

“Remove the I/O bracket (right)” on page 70

“Remove the I/O board with cable” on page 70

“Remove the power board with cable” on page 72

“Remove the fingerprint board with cable” on page 73

Step 1. Remove the fingerprint board lens light guide.

Figure 72. Remove the fingerprint board lens light guide

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Lens light guide

Remove the speakers

Make sure the following FRU (CRU) has been removed.

“Remove the lower case” on page 59

Step 1. Disconnect the battery pack cable from the system board.

74 Hardware Maintenance Manual

Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.

Step 2. Disconnect the speaker cable from the system board and release the speaker cable from the cable

guide. Then, remove the speakers.

Figure 73. Remove the speakers

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Speakers

Remove the system board

Make sure the following FRUs (or CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the 2280 solid-state drive (SSD)” on page 61

“Remove the 2nd solid-state drive (SSD)” on page 62

“Remove the Wi-Fi card” on page 64

“Remove the heat sink” on page 65

“Remove the fan” on page 66

“Remove the memory module” on page 67

“Remove the I/O bracket (left)” on page 69

Step 1. Disconnect cables connected to the system board.

Chapter 4.Removing a FRU or CRU 75

Figure 74. Disconnect cables

Step 2. Remove one screw and then remove the system board.

Figure 75. Remove the system board

Screw specifications Number of screws

M2.0 x L3.0 1

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

System board

Use a Golden Key U1 tool to flash-write key id information

After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to

start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID

to the new system board.

The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb

drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create

and use a Goldern Key U1 tool.

76 Hardware Maintenance Manual

Remove the LCD module

Make sure the following FRUs (CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the heat sink” on page 65

Step 1. Peel off the mylar carefully.

Note: The mylar is not reusable. Replace it when replacing related FRUs.

Figure 76. Peel off the mylar

Step 2. Detach the antenna cable connectors and then disconnect the EDP cable from the system board.

Figure 77. Detach the antenna cable connectors and disconnect the EDP cable

Step 3. Rotate the LCD module to an angle of more than 90 degrees and place the computer on a flat

surface as shown. Remove five screws and then remove the LCD module.

Chapter 4.Removing a FRU or CRU 77

Figure 78. Rotate the LCD module and remove the LCD module

Screw specifications Number of screws

M2.5 x L5.5 5

Remove the upper case (with keyboard and touchpad)

Make sure the following FRUs (CRUs) have been removed.

“Remove the lower case” on page 59

“Remove the battery pack” on page 60

“Remove the 2242 solid-state drive (SSD)” on page 60

“Remove the 2280 solid-state drive (SSD)” on page 61

“Remove the 2nd solid-state drive (SSD)” on page 62

“Remove the 2nd solid-state drive (SSD) bracket” on page 63

“Remove the hard disk drive (HDD)” on page 63

“Remove the Wi-Fi card” on page 64

“Remove the heat sink” on page 65

“Remove the fan” on page 66

“Remove the memory module” on page 67

“Remove the CMOS battery” on page 68

“Remove the I/O bracket (left)” on page 69

“Remove the I/O bracket (right)” on page 70

“Remove the I/O board with cable” on page 70

“Remove the power board with cable” on page 72

“Remove the fingerprint board with cable” on page 73

“Remove the lens light guide” on page 74

“Remove the speakers” on page 74

“Remove the system board” on page 75

78 Hardware Maintenance Manual

“Remove the LCD module” on page 77

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Upper case (with keyboard and touchpad)

Disassemble the LCD module

The LCD module as a whole is not an FRU. Instead, it contains FRUs as its components. Before

disassembling the LCD module, make sure it has been detached from the upper case.

Remove the hinge cover

Make sure the following unit has been removed.

“Remove the LCD module” on page 77

Step 1. Remove the hinge cover.

Figure 79. Remove the hinge cover

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Hinge cover

Remove the LCD bezel

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

Step 1. Remove four screws.

Chapter 4.Removing a FRU or CRU 79

Figure 80. Remove four screws

Screw specifications Number of screws

M2.0 x L4.0 4

Step 2. Remove the LCD bezel carefully.

Note: The LCD bezel is fragile and should be replaced if damaged.

Figure 81. Remove the LCD bezel

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

LCD bezel

Remove the hinges

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

Step 1. Remove eight screws and then remove the hinges.

80 Hardware Maintenance Manual

Figure 82. Remove the hinges

Screw specifications Number of screws

M2.0 x L2.0 6

M2.0 x L4.0 2

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

Hinges

Remove the LCD panel

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

Step 1. Remove the two pieces of removable tape with tweezers.

Note: The removable tape is not reusable. Replace it when replacing related FRUs.

Figure 83. Remove the two pieces of removable tape with tweezers

Chapter 4.Removing a FRU or CRU 81

Step 2. Lift the LCD panel slightly. Peel off the tape. Disconnect the EDP cable from the LCD panel and

then remove the LCD panel.

Figure 84. Disconnect the EDP cable and remove the LCD panel

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

LCD panel

Removable tape

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.

82 Hardware Maintenance Manual

Table 9. 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” on page 82.

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.

Remove the EDP cable

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

“Remove the LCD panel” on page 81

Step 1. Disconnect the EDP cable from the camera board and then remove the EDP cable.

Figure 85. Remove the EDP cable

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Chapter 4.Removing a FRU or CRU 83

EDP cable

Removable tape

Remove the microphone rubbers

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

“Remove the LCD panel” on page 81

Step 1. Remove the microphone rubbers.

Note: The microphone rubbers are not reusable. Replace them when replacing related FRUs.

Figure 86. Remove the microphone rubbers

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Microphone rubbers

Removable tape

Remove the camera

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

“Remove the LCD panel” on page 81

“Remove the microphone rubbers” on page 84

Step 1. Disconnect the EDP cable from the camera board and then remove the camera.

84 Hardware Maintenance Manual

Figure 87. Remove the camera

Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following

replacement parts:

Camera

Removable tape

Remove the LCD cover

Make sure the following FRUs (CRUs) have been removed.

“Remove the LCD module” on page 77

“Remove the hinge cover” on page 79

“Remove the LCD bezel” on page 79

“Remove the hinges” on page 80

“Remove the LCD panel” on page 81

“Remove the EDP cable” on page 83

“Remove the microphone rubbers” on page 84

“Remove the camera” on page 84

Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement

part:

LCD cover

Chapter 4.Removing a FRU or CRU 85

86 Hardware Maintenance Manual

Appendix A. Label locations

ThinkBook 14 G3 ACL

Figure 88. Label layout on the back side of the base cover

Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to

the replacement base cover.

Table 10. All base cover labels

Label Label name Applied country/region Label dimensions

aRating label P.R.China 33 mm x 24 mm

bPrint rating label P.R.China 43 mm x 24 mm

c联想绿色环保处置服务标 16 mm x 21 mm

dCOA label 70 mm x 21 mm

eQR label 17 mm x 26.1 mm

fVGA label 19.53 mm x 16.51 mm

gGML label 16.077 mm x 22.501 mm

hAdapter label 65 mm x 20 mm

ICountry label Argentina 68 mm x 6 mm

jTW label 70 mm x 10 mm

kIndonesia rating label 26 mm x 10 mm

lIndia BIS label 22 mm x 30 mm

mKR KCC label 50 mm x 43 mm

Table 10. All base cover labels (continued)

nJapan 35 mm x 10 mm

oVietnam energy label 10 mm x 9 mm

pWL/BT label Brazil 35 mm x 15 mm

Israel/US/CA/TW 32 mm x 10 mm

South Africa 20 mm x 10 mm

Malaysia/Indonesia 15 mm x 10 mm

ThinkBook 15 G3 ACL

Figure 89. Label layout on the back side of the base cover

Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to

the replacement base cover.

Table 11. All base cover labels

Label Label name Applied country/region Label dimensions

aRating label Worldwide 66 mm x 24 mm

P.R.China 33 mm x 24 mm

India 33 mm x 24 mm

bPrint rating label All 43 mm x 24 mm

cQR label 17 mm x 26.1 mm

dVGA label 19.53 mm x 18 mm

eGML label 16.077 mm x 22.501 mm

fAdapter label 65 mm x 20 mm

88 Hardware Maintenance Manual

Table 11. All base cover labels (continued)

gCountry label Argentina 68 mm x 6 mm

hTW label 70 mm x 10 mm

IIndonesia rating label 26 mm x 10 mm

jKR KCC label 50 mm x 43 mm

kJapan 35 mm x 10 mm

lVietnam energy label 10 mm x 9 mm

mWL/BT label Brazil 35 mm x 15 mm

Israel/US/CA/TW 32 mm x 10 mm

South Africa 20 mm x 10 mm

Malaysia/Indonesia 15 mm x 10 mm

Appendix A. Label locations 89

90 Hardware Maintenance Manual

Trademarks

LENOVO and the LENOVO logo are trademarks of Lenovo.

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Lenovo 15 User Manual

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