Lenovo ThinkPad T550 (English) Hardware Maintenance Manual - ThinkPad T550, W5 - Page 3

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 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 battery and operational charging 27 Checking the coin-cell battery 27 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 Passwords 32 Power-on password 32 Hard disk password 32 Supervisor password 33 How to remove the power-on password . . . 33 How to remove the hard disk password . . . 34 Power management 34 Screen blank mode (for the Windows 7 operating system only 34 Sleep mode 34 Hibernation mode 35 Symptom-to-FRU index 35 Numeric error codes 36 Error messages 37 Beep symptoms 37 No-beep symptoms 38 LCD-related symptoms 38 Intermittent problems 38 Undetermined problems 39 Chapter 5. Locations 41 Locating computer controls, connectors, and indicators 41 Front view 41 Left-side view 42 Bottom view 42 Locating FRUs and CRUs 43 Major FRUs 44 LCD FRUs 45 Miscellaneous parts and other FRUs . . . . 48 Looking up FRU information 49 Chapter 6. FRU replacement notices 51 Common service tools 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 . . . 54 Chapter 7. Removing or replacing a FRU 55 General guidelines 55 Before servicing the computer 56 Disabling the built-in battery 56 Removing the micro SIM card 56 Removing a major FRU 56 1010 Removable battery 57 1020 Base cover assembly 57 1030 Keyboard 59 © Copyright Lenovo 2015 i