Lenovo ThinkPad W541 (English) Hardware Maintenance Manual - ThinkPad T540p, W - 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 27 Checking the battery and operational charging 27 Checking the coin-cell battery 28 Chapter 4. Related service information 29 Restoring the factory contents by using the Recovery Disc Set 29 Using the Windows recovery solutions (for Windows 8 and Windows 8.1 only 30 Refreshing your computer 30 Resetting your computer to the factory default settings 31 Using the advanced startup options . . . . 31 Using the Windows recovery environment . . 32 Creating and using recovery media . . . . . 32 © Copyright Lenovo 2013, 2014 Passwords 33 Power-on password 33 Hard disk password 33 Supervisor password 34 How to remove the power-on password . . . 34 How to remove the hard disk password . . . 34 Power management 35 Screen blank mode (for Windows 7 only) . . 35 Sleep mode 35 Hibernation mode 36 Symptom-to-FRU index 36 Numeric error codes 37 Error messages 38 Beep symptoms 38 No-beep symptoms 39 LCD-related symptoms 39 Intermittent problems 39 Undetermined problems 40 Chapter 5. Status indicators . . . . . 41 Chapter 6. Function keys 43 Chapter 7. Locations 45 Locating computer controls, connectors, and indicators 45 Front view 45 Rear view 46 Bottom view 46 Locating FRUs and CRUs 47 Major FRUs 48 LCD FRUs 50 Miscellaneous parts and other FRUs . . . . 51 Looking up FRU information 51 Chapter 8. FRU replacement notices 53 Screw notices 53 Retaining serial numbers 54 Restoring the serial number of the system unit 54 Retaining the UUID 55 Reading or writing the ECA information . . . 55 Chapter 9. Removing or replacing a FRU 57 General guidelines 57 Common service tools 58 i
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