ThinkPad L420, L421, and L520
Hardware Maintenance Manual
Second Edition April Copyright Lenovo
Contents
Locations 113
ThinkPad L420
About this manual
ThinkPad L421
ThinkPad L520
Iv Hardware Maintenance Manual
General safety
Safety information
Electrical safety
Safety inspection guide
Grounding requirements
Safety notices multilingual translations
Safety information
Hardware Maintenance Manual
Perigo
Perigo
Safety information
Vorsicht
Vorsicht
Hardware Maintenance Manual
Safety information
Hardware Maintenance Manual
Safety information
Hardware Maintenance Manual
Safety information
Laser compliance statement multilingual translations
Safety information
Hardware Maintenance Manual
Safety information
Hardware Maintenance Manual
Safety information
Hardware Maintenance Manual
Strategy for replacing FRUs
Important service information
Strategy for replacing a hard disk drive
How to use error message
Important notice for replacing a system board
General Announce Variant GAV
FRU identification for CTO, CMV, and GAV products
Hardware Maintenance Manual
What to do first
General checkout
Checkout guide
Diagnostics using PC-Doctor for DOS
Testing the computer
Detecting system information with PC-Doctor
Diagnostics Interactive Tests
FRU tests
Lenovo ThinkVantage Toolbox
Applicable test
Checking the ac power adapter
Power system checkout
Checking operational charging
Checking the battery pack
Pin Voltage V dc
Wire Voltage V dc
Checking the backup battery
Terminal Voltage V dc
Restoring the factory contents by using Recovery Disc Set
Related service information
Power-on password
Passwords
Hard-disk password
How to remove the power-on password
Supervisor password
How to remove the hard-disk password
Screen blank mode
Power management
Sleep standby mode
Symptom-to-FRU index
Hibernation mode
Numeric error codes
By connecting the ac power adapter
0250 Charge the backup battery for more than 8 hours
0251 Charge the backup battery for more than 8 hours
0260 Charge the backup battery for more than 8 hours
No-beep symptoms
Error messages
LCD-related symptoms
Undetermined problems
Intermittent problems
Reseat the LCD connectors
See important note for LCD-related symptoms
Hardware Maintenance Manual
Status indicators
Status indicators
Indicator Meaning
Key combination Description
Fn key combinations
For Windows Vista and Windows XP
For Windows
Fn key combinations
Hardware Maintenance Manual
Screw notices
FRU replacement notices
Restoring the serial number of the system unit
Retaining serial numbers
Retaining the Uuid
MTM on rear label
Eeprom
Reading or writing the ECA information
Hardware Maintenance Manual
Important notice for replacing a battery pack
Battery pack
Removing and replacing a FRU
ExpressCard blank bezel and Media Card blank bezel
Removal steps of Media Card blank bezel
Optical drive or travel cover
For access, remove this FRU Battery pack on
Step Screw quantity Color Torque
Thermal cover
Hard disk drive or solid state drive assembly
Removal steps of HDD or SSD assembly
When installing
Dimm
Removal steps of fan assembly
Fan assembly
Removal steps of fan assembly
Removal steps of CPU
1080 CPU
SIM slot cover
Removal steps of SIM slot cover
WAN
M2 × 3 mm, flat-head, nylon-coated Black 181 Nm Kgfcm
MSATA solid state drive
Palm rest assembly with cables
Removal steps of palm rest assembly with cables
Removal steps of palm rest assembly with cables
Removal steps of palm rest assembly with cables
Removal steps of PCI Express Mini Card for wireless LAN
PCI Express Mini Card for wireless LAN
Step Screw quantity Color Torque
Bluetooth daughter card
Backup battery
Removal steps of Bluetooth daughter card
Hardware Maintenance Manual
Keyboard
Removal steps of keyboard
Keyboard bezel
Removal steps of keyboard bezel
LCD unit
Removal steps of LCD unit
For ThinkPad L520 models For ThinkPad L420 and L421 models
Top shielding assembly
For ThinkPad L520 models Step Screw quantity Color Torque
Removal steps of top shielding assembly
Important notices for handling the system board
System board assembly
Hardware Maintenance Manual
Removing and replacing a FRU
Hardware Maintenance Manual
Removal steps of system board assembly
USB connector board and USB cable assembly
For ThinkPad L520 models
DC-in cable and base cover
Removal steps of DC-in cable and base cover
Applying labels to the base cover
LCD front bezel
Speaker assembly
Integrated camera
Antenna assembly
Removal steps of antenna assembly
Hinges, LCD panel, LCD cable, and LCD rear cover assembly
Step Screw quantity Color Torque
M2 × 3 mm, flat-head, nylon-coated Black 181 Nm Kgfcm
Removing and replacing a FRU
Hardware Maintenance Manual
Front view
Locations
Bottom view
Rear view
External CRU statement to customers
Parts list
Overall
CRU
CRU
FRU Overall FRU no
CRU
CRU
CRU
CRU
CRU
DVD-RAM/RW drive 04W1268
DVD-RAM/RW drive 04W1269
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
CRU
WAN
LCD FRUs
Parts list
FRU 14.0-inch HD LCD FRU no
CRU
CRU ID
FRU 15.6-inch HD LCD FRU no
CRU ID
FRU 15.6-inch HD+ LCD FRU no
CRU
Language FRU no
Miscellaneous parts
Ac power adapters
Country or region FRU no
Power cords
Language
Recovery discs Windows XP Professional 32 bit DVDs
Windows Vista Business 32 bit DVDs
Windows Vista Home Basic 32 bit DVDs
US English 03W8061
Windows 7 Home Premium 32 bit DVDs
Windows 7 Home Basic 32 bit DVDs
5016-CTO 5017-CTO 5019-CTO 7859-CTO 7860-CTO
Windows 7 Home Premium 64 bit DVDs
Windows 7 Professional 64 bit DVDs
Windows 7 Professional 32 bit DVDs
Parts list-Windows 7 Professional 64 bit recovery DVDs
Windows 7 Ultimate 64 bit DVDs
Windows 7 Ultimate 32 bit DVDs
Windows 7 Starter 32 bit DVDs
Tool
Common service tools
Hardware Maintenance Manual
Appendix A. Notices
Trademarks
Electronic emissions notices
Page
0A6034201
