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ThinkPad G40, G41
ThinkPad Computer
Hardware Maintenance Manual
July 2005
This manual supports: ThinkPad G40, G41
Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 156.
First Edition (July 2005)
© Copyright Lenovo 2005.
Portions © Copyright International Business Machines
Corporation 2005.
All rights reserved.
U.S. GOVERNMENT USERS – RESTRICTED RIGHTS:
Our products and/or services are provided with
RESTRICTED RIGHTS. Use, duplication or disclosure by
the Government is subject to the GSA ADP Schedule
contract with Lenovo Group Limited, if any, or the standard
terms of this commercial license, or if the agency is unable
to accept this Program under these terms, then we provide
this Program under the provisions set forth in Commercial
Computer Software–Restricted Rights at FAR 52.227-19,
when applicable, or under Rights in Data-General, FAR
52.227.14 (Alternate III).
Contents
About this manual
. . . . . . . . . . . 1
. . . . . . . . . . . . . 3
Important service information . . . . . . . . . 3
Strategy for replacing FRUs . . . . . . . . 3
How to use error messages . . . . . . . . 4
Diskette compatibility matrix . . . . . . . . . 4
Safety notices: multilingual translations . . . . . . 4
Safety information . . . . . . . . . . . . 16
General safety . . . . . . . . . . . . 16
Electrical safety . . . . . . . . . . . 17
Safety inspection guide . . . . . . . . . 19
Handling devices that are sensitive to electrostatic
discharge . . . . . . . . . . . . 20
Grounding requirements . . . . . . . . . 21
Laser compliance statement . . . . . . . . . 21
General descriptions . . . . . . . . . . 25
Read this first . . . . . . . . . . . . . 25
What to do first . . . . . . . . . . . 25
Related service information . . . . . . . . . 28
Service Web site . . . . . . . . . . . 28
Restoring the preloaded system . . . . . . 28
Passwords . . . . . . . . . . . . . 30
Power management . . . . . . . . . . 33
Checkout guide . . . . . . . . . . . . 35
Testing the computer . . . . . . . . . . 35
Detecting system information with PC-Doctor . . . 37
Power system checkout . . . . . . . . . 38
ThinkPad G40, G41 . . . . . . . . . . . 43
Product overview . . . . . . . . . . . . 45
Specifications . . . . . . . . . . . . 45
Status indicators . . . . . . . . . . . 47
FRU tests . . . . . . . . . . . . . 49
Fn key combinations . . . . . . . . . . 51
Symptom-to-FRU index . . . . . . . . . . 52
Numeric error codes . . . . . . . . . . 52
Error messages . . . . . . . . . . . 56
Beep symptoms . . . . . . . . . . . 58
No-beep symptoms . . . . . . . . . . 58
LCD-related symptoms . . . . . . . . . 59
Intermittent problems . . . . . . . . . . 60
Undetermined problems . . . . . . . . . 60
FRU replacement notices . . . . . . . . . 61
Screw notices . . . . . . . . . . . . 61
Retaining serial numbers . . . . . . . . . 62
Removing and replacing a FRU . . . . . . . . 65
1010 Battery pack . . . . . . . . . . . 66
1020 Hard disk drive . . . . . . . . . . 67
© Lenovo 2005. Portions © IBM Corp. 2005.
iii
Introduction
 
 
1030 DIMM door . . . . . . . . . . . 69
1040 DIMM . . . . . . . . . . . . 70
1050 Modem daughter card (MDC) . . . . . 71
1060 Backup battery . . . . . . . . . . 72
1070 Keyboard . . . . . . . . . . . 73
1080 Middle cover . . . . . . . . . . 75
1090 Hinge cover . . . . . . . . . . . 76
1095 FDD assembly . . . . . . . . . . 77
1100 Blank bezel FDD assembly . . . . . . 78
1110 VGA heatsink assembly . . . . . . . 79
1120 VGA card assembly . . . . . . . . 80
1130 CD-ROM/DVD drive and ODD bracket . . . 81
1140 Mini PCI adapter . . . . . . . . . 82
1150 PC card slot assembly . . . . . . . . 83
1160 LCD and Keyboard bezel assembly . . . . 86
1170 LCD assembly . . . . . . . . . . 89
1180 Keyboard bezel . . . . . . . . . . 92
1190 Fan assembly . . . . . . . . . . 94
2000 Fan (CPU 3 GHz) and CPU fixture . . . . 96
2010 CPU . . . . . . . . . . . . . 98
2020 CD-ROM/DVD drive bracket . . . . . . 99
2030 FDD bracket . . . . . . . . . . 100
2040 System board . . . . . . . . . . 101
2050 Lower case assembly . . . . . . . 102
2060 Modem cable . . . . . . . . . . 103
2070 PC card slot assembly . . . . . . . 104
2080 LCD front bezel . . . . . . . . . 105
2090 Inverter card . . . . . . . . . . 106
3000 Speaker assembly . . . . . . . . 107
3010 LCD cable assembly . . . . . . . . 108
3020 Wireless antenna and rear cover . . . . 110
3030 LCD panel and hinge assembly . . . . . 111
Locations . . . . . . . . . . . . . . 112
Front view . . . . . . . . . . . . . 112
Rear view . . . . . . . . . . . . . 113
Bottom view . . . . . . . . . . . . 114
Parts list . . . . . . . . . . . . . . 115
G40, G41 series . . . . . . . . . . . 115
Overall . . . . . . . . . . . . . 139
LCD FRUs . . . . . . . . . . . . 146
Keyboard . . . . . . . . . . . . . 149
Recovery CDs . . . . . . . . . . . 150
Miscellaneous parts . . . . . . . . . . 153
AC adapters . . . . . . . . . . . . 153
Telephone cable . . . . . . . . . . . 153
Optional FRUs . . . . . . . . . . . 154
Common parts list . . . . . . . . . . 154
Notices . . . . . . . . . . . . . . 156
Trademarks . . . . . . . . . . . . . 158
iv ThinkPad G40, G41
About
this manual
This manual contains service and reference information for
ThinkPad G40 and G41 products. Use this manual along
with the advanced diagnostic tests to troubleshoot
problems.
The manual is divided into sections as follows:
v The common sections provide general information,
guidelines, and safety information required in servicing
computers.
v The product-specific section includes service, reference,
and product-specific parts information.
Important
This manual is intended for trained service
personnel who are familiar with ThinkPad products.
Use this manual along with the advanced diagnostic
tests to troubleshoot problems effectively.
Before servicing ThinkPad products, be sure to
review the safety information under “Safety notices:
multilingual translations” on page 4, “Safety
information” on page 16, and “Laser compliance
statement” on page 21.
© Lenovo 2005. Portions © IBM Corp. 2005.
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