Equipment information:

Lenovo ThinkPad L421 Notebook
Manufacturer:
Lenovo
Model: ThinkPad L421
Date: 2012
Category: Computer equipment
Group: Notebook
Description:
Information:
                                    

These manuals are available for the above equipment:

Lenovo -- ThinkPad L421 -- Service Manual
File name: Lenovo-4521-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 164
Size: 14.23 Mbytes (14924174 Bytes)
Language: english
Revision: Sixth edition
Manual-ID/Number: 0A60342_05
Date: March 2012
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: 57ca450948ed994f20e95d27272b4e4c
ed2kID: 71f2c214b6c8f80a448ef8dd35f42c21
Downloads: 210 since 28 April 2013
Information:
About this manual
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.
Important:
This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use
this manual along with the advanced diagnostic tests to troubleshoot problems effectively.
Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety
information” on page 1 and Chapter 2 “Important service information” on page 25

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 . . . . . . . . . . . . 46
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 . . . . . . . . . . . . . . . . . 98
2040 DC-in cable and base cover . . . . . . . 99
2050 LCD front bezel . . . . . . . . . . . . 102
2060 Speaker assembly . . . . . . . . . . . 103
2070 Integrated camera . . . . . . . . . . . 104
2080 Antenna assembly . . . . . . . . . . . 105
2090 Hinges, LCD panel, LCD cable, and LCD rear
cover assembly . . . . . . . . . . . . . . 107
Chapter 9. Locations . . . . . . . . 111
Front view . . . . . . . . . . . . . . . . 111
Rear view. . . . . . . . . . . . . . . . . 112
Bottom view . . . . . . . . . . . . . . . 112
Chapter 10. Parts list . . . . . . . . 113
Overall . . . . . . . . . . . . . . . . . . 114
LCD FRUs . . . . . . . . . . . . . . . . 137
Keyboard . . . . . . . . . . . . . . . . . 142
Miscellaneous parts . . . . . . . . . . . . 143
ac power adapters . . . . . . . . . . . . . 145
Power cords . . . . . . . . . . . . . . . 145
Recovery discs . . . . . . . . . . . . . . 146
Windows XP Professional DVDs . . . . . . 146
Windows Vista Business (32 bit) DVDs . . . 147
Windows Vista Home Basic (32 bit) DVDs . . 148
Windows 7 Home Basic (32 bit) DVDs. . . . 148
Windows 7 Home Basic (64 bit) DVDs. . . . 149
Windows 7 Home Premium (32 bit) DVDs . . 149
Windows 7 Home Premium (64 bit) DVDs . . 150
Windows 7 Professional (32 bit) DVDs. . . . 151
Windows 7 Professional (64 bit) DVDs. . . . 151
Windows 7 Starter (32 bit) DVDs . . . . . . 153
Windows 7 Ultimate (32 bit) DVDs . . . . . 153
Windows 7 Ultimate (64 bit) DVDs . . . . . 154
Common service tools . . . . . . . . . . . 154
Appendix A. Notices . . . . . . . . . 155
Electronic emissions notices . . . . . . . . . 156
Trademarks . . . . . . . . . . . . . . . . 156
Lenovo-4521-Manual-Page-1-Picture
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