Lenovo ThinkPad T431s Hardware Maintenance Manual - Page 3

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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, and standard models 20 Product definition 20 FRU identification 20 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 25 Power system checkout 26 Checking the ac power adapter 26 Checking the built-in battery and operational charging 27 Checking the backup battery 27 Chapter 4. Related service information 29 Restoring the factory contents by using the Recovery Disc Set 29 Using the Windows recovery programs on the Windows 8 operating system 30 Passwords 31 Power-on password 31 Hard disk password 31 Supervisor password 32 How to remove the power-on password . . . 32 How to remove the hard disk password . . . 32 © Copyright Lenovo 2013 Power management 33 Screen blank mode (for the Windows 7 operating system only 33 Sleep mode 33 Hibernation mode 34 Symptom-to-FRU index 34 Numeric error codes 35 Error messages 36 Beep symptoms 36 No-beep symptoms 37 LCD-related symptoms 37 Intermittent problems 38 Undetermined problems 38 Chapter 5. Status indicators . . . . . 39 Chapter 6. Function keys 41 Chapter 7. Locations 43 Locating computer controls, connectors, and indicators 43 Front view 43 Rear view 44 Bottom view 44 Locating FRUs and CRUs 45 Major FRUs 46 LCD FRUs 48 Miscellaneous parts and other FRUs . . . . 48 Looking up FRU information 49 Chapter 8. FRU replacement notices 51 Screw notices 51 Retaining serial numbers 52 Restoring the serial number of the system unit 52 Retaining the UUID 53 Reading or writing the ECA information . . . 53 Chapter 9. Removing or replacing a FRU 55 General guidelines 55 Before servicing the computer 56 Disabling the built-in battery 56 Removing the SIM card 56 1010 Base cover 57 1020 Hard disk drive or solid-state drive . . . . 58 1030 M.2 wireless LAN card 59 i

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Contents
About this manual
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iii
Chapter 1. Safety information
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1
General safety
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1
Electrical safety
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1
Safety inspection guide
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2
Handling devices that are sensitive to electrostatic
discharge
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3
Grounding requirements
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4
Safety notices (multilingual translations)
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4
Chapter 2. Important service
information
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19
Strategy for replacing FRUs
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19
Strategy for replacing a hard disk drive or a
solid-state drive
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19
Important notice for replacing a system
board
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20
How to use error message
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20
Strategy for replacing FRUs for CTO, special-bid,
and standard models
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20
Product definition
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20
FRU identification
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20
Chapter 3. General checkout
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23
What to do first
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23
Checkout guide
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24
Lenovo Solution Center
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24
Quick test programs
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24
UEFI diagnostic program
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25
Bootable diagnostic programs
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25
Power system checkout
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26
Checking the ac power adapter
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26
Checking the built-in battery and operational
charging
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27
Checking the backup battery
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27
Chapter 4. Related service
information
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29
Restoring the factory contents by using the
Recovery Disc Set
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29
Using the Windows recovery programs on the
Windows 8 operating system
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30
Passwords
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31
Power-on password
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31
Hard disk password
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31
Supervisor password
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32
How to remove the power-on password .
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32
How to remove the hard disk password .
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32
Power management
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33
Screen blank mode (for the Windows 7
operating system only)
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33
Sleep mode
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Hibernation mode
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34
Symptom-to-FRU index
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34
Numeric error codes
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Error messages
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Beep symptoms
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No-beep symptoms
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37
LCD-related symptoms
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37
Intermittent problems
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38
Undetermined problems
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38
Chapter 5. Status indicators
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39
Chapter 6. Function keys
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41
Chapter 7. Locations
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43
Locating computer controls, connectors, and
indicators
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43
Front view
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43
Rear view
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44
Bottom view
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44
Locating FRUs and CRUs
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45
Major FRUs
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46
LCD FRUs
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48
Miscellaneous parts and other FRUs
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48
Looking up FRU information
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49
Chapter 8. FRU replacement
notices
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51
Screw notices
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51
Retaining serial numbers
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52
Restoring the serial number of the system
unit
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52
Retaining the UUID
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53
Reading or writing the ECA information .
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53
Chapter 9. Removing or replacing a
FRU
..................
55
General guidelines
.
.
.
.
.
.
.
.
.
.
.
.
.
55
Before servicing the computer
.
.
.
.
.
.
.
.
56
Disabling the built-in battery
.
.
.
.
.
.
.
56
Removing the SIM card
.
.
.
.
.
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.
.
56
1010 Base cover
.
.
.
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.
.
.
.
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57
1020 Hard disk drive or solid-state drive
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.
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58
1030 M.2 wireless LAN card
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59
© Copyright Lenovo 2013
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