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 . . . . . . . . . . . . . 2
discharge . . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multilingual translations) . . . . . . 4
Chapter 2. General checkout . . . . . 21
What to do first . . . . . . . . . . . . . . .
CRU list . . . . . . . . . . . . . . . . . .
(CRUs) . . . . . . . . . . . . . . . . . 23
CRU . . . . . . . . . . . . . . . . . . 33
Service tools . . . . . . . . . . . . . . . .
General guidelines . . . . . . . . . . . . . .
ThinkBook 14 G4 ABA . . . . . . . . . . . .
Remove the lower case . . . . . . . . . .
Remove the battery pack . . . . . . . . .
thermalpad . . . . . . . . . . . . . . .
bracket . . . . . . . . . . . . . . . .
Remove the Wi-Fi card . . . . . . . . . .
IAP and ThinkBook 15 G4 IAP only) . . . . .
ThinkBook 15 G4 IAP only). . . . . . . . .
Remove the memory module . . . . . . . .
Remove the CMOS battery . . . . . . . .
© Copyright Lenovo 2022
. . . . . . . . . . .
Remove the I/O bracket (left) . . . . . . . .
Remove the I/O bracket (right) . . . . . . .
Remove the I/O board with cable . . . . . .
Remove the power board with cable . . . . .
Remove the lens light guide . . . . . . . .
Remove the speakers. . . . . . . . . . .
Remove the system board . . . . . . . . .
Remove the LCD module . . . . . . . . .
touchpad) . . . . . . . . . . . . . . .
Disassemble the LCD module . . . . . . .
21
22
ThinkBook 15 G4 ABA . . . . . . . . . . . .
Remove the lower case . . . . . . . . . .
Remove the battery pack . . . . . . . . .
23
Remove the solid-state drive (SSD) . . . . .
bracket . . . . . . . . . . . . . . . .
33
Remove the Wi-Fi card . . . . . . . . . .
33
Remove the memory module . . . . . . . .
Remove the CMOS battery . . . . . . . .
34
Remove the I/O bracket (left) . . . . . . . .
34
Remove the I/O bracket (right) . . . . . . .
35
Remove the I/O board with cable . . . . . .
36
Remove the power board with cable . . . . .
36
38
Remove the lens light guide . . . . . . . .
Remove the speakers. . . . . . . . . . .
38
Remove the system board . . . . . . . . .
39
Remove the LCD module . . . . . . . . .
40
touchpad) . . . . . . . . . . . . . . .
Disassemble the LCD module . . . . . . .
41
Appendix A. Label locations. . . . . . 85
42
Trademarks . . . . . . . . . . . . . . . lxxxix
43
44
nd
solid-state drive (SSD) . . . .
44
45
46
47
49
50
51
51
53
54
55
62
62
63
63
64
65
66
66
68
69
70
70
71
73
74
74
75
75
77
78
78
i
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