Table Of Contents - Lenovo ThinkPad T490 Hardware Maintenance Manual
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Also See for ThinkPad T490:
- User manual (126 pages) ,
- Setup manual (12 pages) ,
- Setup manual (6 pages)
Table of Contents
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Contents
About this manual . . . . . . . . . . . . iii
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection guide . . . . . . . . . . . . . 3
discharge . . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multilingual translations) . . . . . . 4
information . . . . . . . . . . . . . . . 21
Strategy for replacing FRUs . . . . . . . . . .
solid-state drive . . . . . . . . . . . . .
board . . . . . . . . . . . . . . . . .
How to use error codes . . . . . . . . . .
and standard models. . . . . . . . . . . . .
Product definition . . . . . . . . . . . .
FRU identification . . . . . . . . . . . .
Chapter 3. General checkout . . . . . 25
What to do first . . . . . . . . . . . . . . .
Checkout guide . . . . . . . . . . . . . . .
Diagnosing problems . . . . . . . . . . .
Quick test programs . . . . . . . . . . .
UEFI diagnostic program . . . . . . . . .
Bootable diagnostic programs . . . . . . .
Power system checkout . . . . . . . . . . .
Checking the ac power adapter . . . . . . .
charging . . . . . . . . . . . . . . . .
Checking the coin-cell battery . . . . . . .
information . . . . . . . . . . . . . . . 31
system . . . . . . . . . . . . . . . . . .
Resetting your computer . . . . . . . . . . .
Using advanced startup options . . . . . . . .
fails to start . . . . . . . . . . . . . . . .
Creating and using a recovery USB drive . . . . .
Passwords. . . . . . . . . . . . . . . . .
Power-on password . . . . . . . . . . .
Hard disk password . . . . . . . . . . .
© Copyright Lenovo 2019
Supervisor password . . . . . . . . . . .
Power management . . . . . . . . . . . . .
Sleep mode . . . . . . . . . . . . . .
Hibernation mode . . . . . . . . . . . .
Symptom-to-FRU index . . . . . . . . . . .
Numeric error codes . . . . . . . . . . .
Error messages . . . . . . . . . . . . .
Beep errors. . . . . . . . . . . . . . .
No-beep symptoms . . . . . . . . . . .
LCD-related symptoms . . . . . . . . . .
Intermittent problems . . . . . . . . . . .
21
21
Chapter 5. Special keys . . . . . . . . 43
22
Chapter 6. Locations . . . . . . . . . 45
22
indicators . . . . . . . . . . . . . . . . .
22
Front . . . . . . . . . . . . . . . . .
22
Base . . . . . . . . . . . . . . . . .
23
Left . . . . . . . . . . . . . . . . . .
Right . . . . . . . . . . . . . . . . .
Bottom . . . . . . . . . . . . . . . .
25
26
Rear . . . . . . . . . . . . . . . . .
Locating FRUs and CRUs . . . . . . . . . . .
26
Major FRUs and CRUs . . . . . . . . . .
26
27
LCD FRUs . . . . . . . . . . . . . . .
Miscellaneous parts . . . . . . . . . . .
27
Connector and cable guide . . . . . . . .
28
28
Looking up FRU information . . . . . . . . . .
29
notices . . . . . . . . . . . . . . . . . 57
29
Service tool kit . . . . . . . . . . . . . . .
Screw notices . . . . . . . . . . . . . . .
Retaining serial numbers . . . . . . . . . . .
31
unit . . . . . . . . . . . . . . . . . .
31
Retaining the UUID. . . . . . . . . . . .
31
32
FRU. . . . . . . . . . . . . . . . . . . 61
32
General guidelines. . . . . . . . . . . . . .
33
Before servicing the computer . . . . . . . . .
33
Disabling the built-in battery . . . . . . . .
33
33
34
34
35
35
35
36
36
38
38
40
40
41
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41
45
45
46
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48
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49
51
52
53
55
57
57
58
58
59
61
62
62
i
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