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Lenovo ThinkPad T420 T420i

Tags : LenovoThinkPadT420T420i4177417841794180423642374238 
Lenovo ThinkPad T420 T420i Hardware Maintenance Manual

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Description

Lenovo ThinkPad T420 T420i Hardware Maintenance Manual
Sixth Edition (September 2012) - 186 pages

This manual contains service and reference information for the following ThinkPad® products.

ThinkPad T420 and T420i Machine Type 4177, 4178, 4179, 4180, 4236, 4237, and 4238

Use this manual along with the advanced diagnostic tests to troubleshoot problems.

Contents
About this manual. . . . . . . . . . . iii
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . 2
Safety inspection guide . . . . . . . . . . . . 3
Handling devices that are sensitive to electrostatic
discharge. . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multilingual translations) . . . . . . 5
Laser compliance statement (multilingual
translations) . . . . . . . . . . . . . . . . 17
Chapter 2. Important service
information . . . . . . . . . . . . . . 23
Strategy for replacing FRUs . . . . . . . . . 23
Strategy for replacing a hard disk drive . . . 23
Important notice for replacing a system
board . . . . . . . . . . . . . . . . 24
How to use error message . . . . . . . . 24
Strategy for replacing FRUs for CTO, CMV, and
GAV . . . . . . . . . . . . . . . . . . . 25
Product definition . . . . . . . . . . . . 25
FRU identification for CTO, CMV, and GAV
products . . . . . . . . . . . . . . . 25
Chapter 3. General checkout . . . . . 27
What to do first . . . . . . . . . . . . . . 28
Checkout guide . . . . . . . . . . . . . . 29
System supporting the Lenovo ThinkVantage
Toolbox program and the PC-Doctor for DOS
diagnostics program . . . . . . . . . . 29
System supporting the Lenovo diagnostics
programs . . . . . . . . . . . . . . . 33
Power system checkout . . . . . . . . . . . 37
Checking the ac power adapter . . . . . . 37
Checking operational charging . . . . . . 37
Checking the battery pack . . . . . . . . 38
Checking the backup battery . . . . . . . 38
Chapter 4. Related service
information . . . . . . . . . . . . . . 41
Restoring the factory contents by using Recovery
Disc Set . . . . . . . . . . . . . . . . . 41
Passwords . . . . . . . . . . . . . . . . 42
Power-on password . . . . . . . . . . . 42
Hard-disk password. . . . . . . . . . . 42
Supervisor password . . . . . . . . . . 43
How to remove the power-on password . . . 43
How to remove the hard-disk password . . . 43
Power management . . . . . . . . . . . . 45
Screen blank mode . . . . . . . . . . . 45
Sleep (standby) mode . . . . . . . . . . 45
Hibernation mode . . . . . . . . . . . 45
Symptom-to-FRU index . . . . . . . . . . . 47
Numeric error codes . . . . . . . . . . 47
Error messages . . . . . . . . . . . . 49
Beep symptoms . . . . . . . . . . . . 50
No-beep symptoms . . . . . . . . . . . 50
LCD-related symptoms . . . . . . . . . 50
Intermittent problems . . . . . . . . . . 52
Undetermined problems . . . . . . . . . 52
Chapter 5. Status indicators . . . . . 53
Chapter 6. Fn key combinations . . . 57
Chapter 7. FRU replacement
notices . . . . . . . . . . . . . . . . 61
Screw notices . . . . . . . . . . . . . . . 61
Retaining serial numbers. . . . . . . . . . . 62
Restoring the serial number of the system
unit . . . . . . . . . . . . . . . . . 62
Retaining the UUID . . . . . . . . . . . 63
Reading or writing the ECA information . . . 63
Chapter 8. Removing and replacing a
FRU . . . . . . . . . . . . . . . . . . 65
Before servicing ThinkPad T420 and T420i . . . 66
1010 Battery pack . . . . . . . . . . . . . 67
1020 ExpressCard blank bezel . . . . . . . . 68
1030 Serial Ultrabay Enhanced device or travel
bezel . . . . . . . . . . . . . . . . . . 69
1040 Hard disk drive (HDD) and solid state drive
(SSD) . . . . . . . . . . . . . . . . . . 70
1050 DIMM slot cover . . . . . . . . . . . . 73
1060 DIMM (in the slot on the underside of the
computer) . . . . . . . . . . . . . . . . 74
1070 PCI Express Mini Card for wireless WAN . . 75
1080 Keyboard . . . . . . . . . . . . . . 77
1090 DIMM (in the slot under the keyboard) . . . 81
1100 Backup battery . . . . . . . . . . . . 83
1110 PCI Express Mini Card for wireless LAN . . 85
1120 Keyboard bezel assembly, FPC cable, and
Bluethooth daughter card . . . . . . . . . . 87
1130 SmartCard . . . . . . . . . . . . . . 92
1140 Modem daughter card (MDC). . . . . . . 94
1150 Speaker assembly . . . . . . . . . . . 95
1160 LCD unit . . . . . . . . . . . . . . . 97
1170 Fan assembly . . . . . . . . . . . . . 101
1180 CPU . . . . . . . . . . . . . . . . 105
1190 Base cover assembly and DC-in connector
cable . . . . . . . . . . . . . . . . . . 106
1200 Magnesium structure frame . . . . . . . 110
1210 System board and ExpressCard slot
assembly . . . . . . . . . . . . . . . . . 112
1220 mSATA solid state drive . . . . . . . . . 114
2010 LCD bezel assembly . . . . . . . . . . 116
2020 LED board . . . . . . . . . . . . . . 117
2030 Integrated camera . . . . . . . . . . . 119
2040 LCD panel and LCD cable . . . . . . . . 121
2050 Camera cable . . . . . . . . . . . . . 123
2060 Wireless LAN antenna assembly or wireless
LAN/WAN antenna assembly . . . . . . . . . 124
2070 Hinges and LCD rear cover assembly . . . 126
Chapter 9. Locations . . . . . . . . 129
Front view . . . . . . . . . . . . . . . . 129
Rear view. . . . . . . . . . . . . . . . . 131
Bottom view . . . . . . . . . . . . . . . 132
Chapter 10. Parts list . . . . . . . . 133
Overall . . . . . . . . . . . . . . . . . . 134
LCD FRUs . . . . . . . . . . . . . . . . 155
Keyboard . . . . . . . . . . . . . . . . . 160
Miscellaneous parts . . . . . . . . . . . . 162
Information about ac power adapters. . . . . . 164
Power cords . . . . . . . . . . . . . . . 165
Recovery discs . . . . . . . . . . . . . . 166
Common service tools . . . . . . . . . . . 173
Appendix A. Notices . . . . . . . . . 175
Electronic emissions notices . . . . . . . . . 176
Trademarks . . . . . . . . . . . . . . . . 177



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