ThinkPad

Hardware Maintenance Manual

ThinkPad L440 and L540

Note: Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 127.

Contents

About this manual. iii
Chapter 1. Safety information. 1
General safety. 1
Electrical safety. 2
Safety inspection guide. 3
Handling devices that are sensitive to electrostatic discharge. 3
Grounding requirements. 4
Safety notices (multilingual translations). 4
Laser compliance statement (multilingual translations). 17
Chapter 2. Important service information 23
Strategy for replacing FRUs. 23
Strategy for replacing a hard disk drive, a solid-state drive, or an M.2 solid-state drive. 24
Important notice for replacing a system board. 24
How to use error message. 24
Strategy for replacing FRUs for CTO, special-bid, and standard models. 24
Product definition. 24
FRU identification. 25
Chapter 3. General checkout. 27
What to do first. 27
Checkout guide. 28
Lenovo Solution Center. 28
Quick test programs. 28
UEFI diagnostic program. 29
Bootable diagnostic programs. 29
Power system checkout. 30
Checking the ac power adapter. 30
Checking operational charging. 31
Checking the battery pack. 31
Checking the coin-cell battery. 32
Chapter 4. Related service information 33
Restoring the factory contents by using the Recovery Disc Set. 33
Using the Windows recovery programs on the Windows 8 operating system. 34
Passwords. 36
Power-on password. 37
Hard-disk password. 37
Supervisor password. 37

How to remove the power-on password . 37
How to remove the hard-disk password . 38
Power management . 38
Screen blank mode (for the Windows 7 operating system only) . 38
Sleep mode . 38
Hibernation mode . 39
Symptom-to-FRU index . 39
Numeric error codes . 40
Error messages . 41
Beep errors . 42
LCD-related symptoms . 42
Intermittent problems . 43
Undetermined problems . 43
Chapter 5. Status indicators . 45
Chapter 6. Fn key combinations . 47
Chapter 7. Locations . 49
Locating computer controls, connectors, and indicators. 49
ThinkPad L440 overview . 49
ThinkPad L540 overview . 51
Locating FRUs and CRUs . 52
Major FRUs and CRUs. 54
LCD FRUs and CRUs . 56
Miscellaneous kits and other FRUs . 57
Looking up FRU information . 57
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
Before servicing the computer . 64
1010 Battery pack . 64
1020 Bottom door . 65
1030 Optical drive . 66
1040 Hard disk drive or solid-state drive . 68
1050 Memory module . 69
1060 WWAN card or M.2 solid-state drive . 70

1070 WLAN card. 72
1080 Coin-cell battery. 73
1090 Thermal-fan assembly 74
1100 Keyboard 77
1110 Keyboard bezel assembly, fingerprint reader, and power button card 87
1120 Smart card reader, smart card door, and dummy smart card 98
1130 Microprocessor 100
1140 System board assembly 101
1150 Audio board 106
1160 Speaker assembly 107
1170 Hinge bracket, dc-in cable assembly, RJ45 card, and base cover assembly 109

2010 LCD unit

About this manual

This manual contains service and reference information for the following ThinkPad $ ^{®} $ notebook computers.

ThinkPad L440

Machine Type (MT) 20AS and 20AT

ThinkPad L540

MT 20AU and 20AV

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 23.

Chapter 1. Safety information

This chapter presents the 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 2

• “Safety inspection guide” on page 3

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

• “Grounding requirements” on page 4

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

• “Laser compliance statement (multilingual translations)” on page 17

General safety

Follow these rules to ensure general safety:

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

• When lifting any heavy object:

1. Ensure that you stand safely without slipping.

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

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

4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you think is too heavy for you.

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

• Before you start the machine, ensure that other service technicians and the customer's personnel are not in a hazardous position.

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

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

• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8 centimeters (3 inches) from the end.

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

Attention: