Lenovo T490s Hardware Maintenance Manual

T490s and X390

Hardware Maintenance Manual

ThinkPad Lenovo

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 (April 2020)

© Copyright Lenovo 2020.

LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a 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 ..... 3
Handling devices that are sensitive to electrostatic discharge ..... 3
Grounding requirements ..... 4
Safety notices (multilingual translations) ..... 4
Chapter 2. Important service information ..... 21
Strategy for replacing FRUs ..... 21
Strategy for replacing a solid-state drive ..... 21
Important notice for replacing a system board ..... 22
How to use error message ..... 22
Strategy for replacing FRUs for CTO, special-bid, and standard models ..... 22
Product definition ..... 22
FRU identification ..... 22
Chapter 3. General checkout ..... 25
What to do first ..... 25
Checkout guide ..... 26
Diagnosing problems ..... 26
Quick test programs ..... 27
UEFI diagnostic program ..... 27
Bootable diagnostic programs ..... 27
Power system checkout ..... 28
Checking the ac power adapter ..... 29
Checking the built-in battery and operational charging ..... 29
Checking the coin-cell battery ..... 29
Chapter 4. Related service information ..... 31
Recovery information for the Windows 10 operating system ..... 31
Resetting your computer ..... 31
Using advanced startup options ..... 31
Recovering your operating system if Windows 10 fails to start ..... 32
Creating and using a recovery USB drive ..... 32
Passwords ..... 33
Power-on password ..... 33
Hard disk password ..... 33
Supervisor password ..... 33

How to remove the power-on password ..... 34
How to remove the hard disk password ..... 34
Power management ..... 35
Sleep mode ..... 35
Hibernation mode ..... 35
Symptom-to-FRU index ..... 36
Numeric error codes ..... 36
Error messages ..... 37
Beep errors ..... 38
No-beep symptoms ..... 39
LCD-related symptoms ..... 40
Intermittent problems ..... 41
Undetermined problems ..... 41
Chapter 5. Special keys ..... 43
Chapter 6. Locations ..... 47
Locating computer controls, connectors, and indicators ..... 47
Front ..... 47
Base ..... 48
Left ..... 49
Right ..... 49
Rear ..... 50
Bottom ..... 51
Locating FRUs and CRUs ..... 51
Major FRUs and CRUs ..... 52
LCD FRUs and CRUs ..... 58
Miscellaneous parts ..... 60
Connector and cable guide ..... 60
Looking up FRU information ..... 63
Chapter 7. FRU replacement notices ..... 65
Screw notices ..... 65
Retaining serial numbers ..... 66
Restoring the serial number of the system unit ..... 66
Retaining the UUID ..... 66
Reading or writing the ECA information ..... 67
Chapter 8. Removing or replacing a FRU ..... 69
General guidelines ..... 69
Before servicing the computer ..... 69
Disabling the built-in battery ..... 69
Removing the nano-SIM-card and microSD card tray ..... 70

1010 Keyboard (for ThinkPad X390 only) . . . . . . 70
1020 Base cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
1030 M.2 solid-state drive, bracket, and thermal pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .