Hardware Maintenance Manual

ThinkPad Yoga 12

Note: Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 107.

Second Edition (July 2015)

© Copyright Lenovo 2015.

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to 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 19
Strategy for replacing FRUs. 19
Strategy for replacing a hard disk drive or a solid-state drive. 19
Important notice for replacing a system board. 20
How to use error message. 20
Strategy for replacing FRUs for CTO, special bid model, and standard models. 20
Product definition. 20
FRU identification. 21
Chapter 3. General checkout. 23
What to do first. 23
Checkout guide. 24
Lenovo Solution Center. 24
Quick test programs. 24
UEFI diagnostic program. 25
Bootable diagnostic programs. 26
Power system checkout. 27
Checking the ac power adapter. 27
Checking the built-in battery and operational charging. 27
Checking the coin-cell battery. 28
Chapter 4. Related service information 29
Restoring the factory contents by using the product Recovery Disc Set. 29
Using the Windows recovery programs on the Windows 8.1 operating system. 30
Refreshing your computer. 30
Resetting your computer to the factory default settings. 30
Using the advanced startup options. 31
Recovering your operating system if Windows 8.1 fails to start. 31

Creating and using recovery media . . . . . Recovery overview for the Windows 10 operating system.

Restoring the serial number of the system unit ..... 56
Retaining the UUID ..... 57
Chapter 9. Removing or replacing a FRU ..... 59
General guidelines ..... 59
Before servicing the computer ..... 60
Disabling the built-in battery ..... 60
1010 Lenovo OneLink connector cover ..... 60
1020 Base cover assembly ..... 60
1030 Speaker assembly ..... 63
1040 Battery ..... 64
1050 Hard disk drive or solid-state drive ..... 65
1060 Wireless-LAN card ..... 68
1070 M.2 solid-state drive ..... 70
1080 Hard-disk-drive/buttons card and hard-disk-drive/buttons cable ..... 71
1090 P sensor ..... 72
1100 System board ..... 73
1110 Coin-cell battery ..... 77

1120 Thermal fan assembly ..... 78
1130 Keyboard assembly ..... 80
1140 Keyboard bezel assembly and the LCD unit ..... 86
2010 LCD bezel assembly ..... 88
2020 Windows home-button board ..... 89
2030 LCD hinges ..... 90
2040 LCD panel ..... 96
2050 Camera/microphone assembly ..... 98
2060 Sensor card ..... 100
2070 LCD cable assembly ..... 100
2080 Camera/microphone cable or camera/digitizer/microphone cable ..... 101
2090 Wireless-LAN antenna kit and LCD rear-cover assembly ..... 103
Appendix A. Notices. ..... 107
Electronic emissions notices ..... 108
Trademarks ..... 108
Appendix B. Abbreviation table ..... 109

About this manual

This manual contains service and reference information for the following ThinkPad $ ^{\circledR} $ products:

ThinkPad Yoga $ ^{\textregistered} $ 12

Machine types (MT) 20DK and 20DL

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 19.

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 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