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Lenovo ThinkPad L420 L421 L520

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Lenovo ThinkPad L420 L421 L520 Hardware Maintenance Manual

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Description

Lenovo ThinkPad L420 L421 L520 Hardware Maintenance Manual
Eighth Edition (October 2013) - 160 Pages

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

ThinkPad L420
Machine Type (MT) 7826, 7827, 7829, 7853, 7854, and 7856

ThinkPad L421
MT 7826, 7827, 7829, 7853, 7854, and 7856

ThinkPad L520
MT 5015, 5016, 5017, 5019, 7859, and 7860

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) . . . . . . 4
Laser compliance statement (multilingual
translations) . . . . . . . . . . . . . . . . 17
Chapter 2. Important service
information . . . . . . . . . . . . . . 25
Strategy for replacing FRUs . . . . . . . . . 25
Strategy for replacing a hard disk drive . . . 26
Important notice for replacing a system
board . . . . . . . . . . . . . . . . 26
How to use error message . . . . . . . . 26
Strategy for replacing FRUs for CTO, CMV, and
GAV . . . . . . . . . . . . . . . . . . . 26
Product definition . . . . . . . . . . . . 26
FRU identification for CTO, CMV, and GAV
products . . . . . . . . . . . . . . . 27
Chapter 3. General checkout . . . . . 29
What to do first . . . . . . . . . . . . . . 29
Checkout guide . . . . . . . . . . . . . . 30
System supporting the Lenovo ThinkVantage
Toolbox program and the PC-Doctor for DOS
diagnostics program . . . . . . . . . . 30
System supporting the Lenovo diagnostics
programs . . . . . . . . . . . . . . . 34
Power system checkout . . . . . . . . . . . 36
Checking the ac power adapter . . . . . . 36
Checking operational charging . . . . . . 37
Checking the battery pack . . . . . . . . 37
Checking the backup battery . . . . . . . 38
Chapter 4. Related service
information . . . . . . . . . . . . . . 39
Restoring the factory contents by using Recovery
Disc Set . . . . . . . . . . . . . . . . . 39
Passwords . . . . . . . . . . . . . . . . 40
Power-on password . . . . . . . . . . . 40
Hard-disk password. . . . . . . . . . . 40
Supervisor password . . . . . . . . . . 41
How to remove the power-on password . . . 41
How to remove the hard-disk password . . . 41
Power management . . . . . . . . . . . . 42
Screen blank mode . . . . . . . . . . . 42
Sleep (standby) mode . . . . . . . . . . 42
Hibernation mode . . . . . . . . . . . 43
Symptom-to-FRU index . . . . . . . . . . . 43
Numeric error codes . . . . . . . . . . 44
Error messages . . . . . . . . . . . . 45
No-beep symptoms . . . . . . . . . . . 46
LCD-related symptoms . . . . . . . . . 46
Intermittent problems . . . . . . . . . . 47
Undetermined problems . . . . . . . . . 47
Chapter 5. Status indicators . . . . . 49
Chapter 6. Fn key combinations . . . 51
Chapter 7. FRU replacement
notices . . . . . . . . . . . . . . . . 55
Screw notices . . . . . . . . . . . . . . . 55
Retaining serial numbers. . . . . . . . . . . 56
Restoring the serial number of the system
unit . . . . . . . . . . . . . . . . . 56
Retaining the UUID . . . . . . . . . . . 56
Reading or writing the ECA information . . . 57
Chapter 8. Removing and replacing a
FRU . . . . . . . . . . . . . . . . . . 59
1010 Battery pack . . . . . . . . . . . . . 59
1020 ExpressCard blank bezel and Media Card
blank bezel . . . . . . . . . . . . . . . . 60
1030 Optical drive or travel cover . . . . . . . 62
1040 Thermal cover. . . . . . . . . . . . . 63
1050 Hard disk drive or solid state drive
assembly . . . . . . . . . . . . . . . . . 64
1060 DIMM . . . . . . . . . . . . . . . . 67
1070 Fan assembly . . . . . . . . . . . . . 67
1080 CPU . . . . . . . . . . . . . . . . 70
1090 SIM slot cover . . . . . . . . . . . . 71
1110 Wireless WAN slot cover and PCI Express
Mini Card for wireless WAN. . . . . . . . . . 72
1110 mSATA solid state drive . . . . . . . . . 73
1120 Palm rest assembly with cables . . . . . . 75
1130 PCI Express Mini Card for wireless LAN . . 78
1140 Backup battery . . . . . . . . . . . . 80
1150 Bluetooth daughter card . . . . . . . . 80
1160 Media Card Reader slot board and Media
Card Reader cable assembly . . . . . . . . . 81
1170 Keyboard . . . . . . . . . . . . . . 83
1180 Keyboard bezel . . . . . . . . . . . . 85
1190 LCD unit . . . . . . . . . . . . . . . 87
2010 Top shielding assembly . . . . . . . . . 90
2020 System board assembly. . . . . . . . . 92
2030 USB connector board and USB cable
assembly . . . . . . . . . . . . . . . . . 96
2040 DC-in cable and base cover . . . . . . . 97
2050 LCD front bezel . . . . . . . . . . . . 99
2060 Speaker assembly . . . . . . . . . . . 100
2070 Integrated camera . . . . . . . . . . . 101
2080 Antenna assembly . . . . . . . . . . . 102
2090 Hinges, LCD panel, LCD cable, and LCD rear
cover assembly . . . . . . . . . . . . . . 104
Chapter 9. Locations . . . . . . . . 107
Front view . . . . . . . . . . . . . . . . 107
Rear view. . . . . . . . . . . . . . . . . 108
Bottom view . . . . . . . . . . . . . . . 108
Chapter 10. Parts list . . . . . . . . 109
Overall . . . . . . . . . . . . . . . . . . 110
LCD FRUs . . . . . . . . . . . . . . . . 133
Keyboard . . . . . . . . . . . . . . . . . 138
Miscellaneous parts . . . . . . . . . . . . 139
ac power adapters . . . . . . . . . . . . . 140
Power cords . . . . . . . . . . . . . . . 140
Recovery discs . . . . . . . . . . . . . . 141
Windows XP Professional DVDs . . . . . . 141
Windows Vista Business (32 bit) DVDs . . . 142
Windows Vista Home Basic (32 bit) DVDs . . 142
Windows 7 Home Basic (32 bit) DVDs. . . . 143
Windows 7 Home Basic (64 bit) DVDs. . . . 143
Windows 7 Home Premium (32 bit) DVDs . . 144
Windows 7 Home Premium (64 bit) DVDs . . 144
Windows 7 Professional (32 bit) DVDs. . . . 145
Windows 7 Professional (64 bit) DVDs. . . . 146
Windows 7 Starter (32 bit) DVDs . . . . . . 147
Windows 7 Ultimate (32 bit) DVDs . . . . . 148
Windows 7 Ultimate (64 bit) DVDs . . . . . 148
Common service tools . . . . . . . . . . . 149
Appendix A. Notices . . . . . . . . . 151
Electronic emissions notices . . . . . . . . . 152
Trademarks . . . . . . . . . . . . . . . . 152



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