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Removing and replacing a FRU
Models:
T420i
T420
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178 pages
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Install
Before replacing parts
Parts list
Error codes
Password
Status indicators
Wire Voltage V dc
Dynamic Configure To Order CTO
Symptom-to-FRU index
Diagnostics Interactive Tests
Page 91
Image 91
When installing:
Make sure that the connector is attached firmly.
Chapter 8
.
Removing and replacing a FRU
85
Page 90
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Contents
ThinkPad T420 and T420i Hardware Maintenance Manual
Fourth Edition November Copyright Lenovo
Contents
Locations 125
Iii
About this manual
Iv ThinkPad T420 and T420i Hardware Maintenance Manual
General safety
Safety information
Electrical safety
Safety inspection guide
Grounding requirements
Safety notices multilingual translations
ThinkPad T420 and T420i Hardware Maintenance Manual
Perigo
Perigo
Perigo
Vorsicht
Vorsicht
ThinkPad T420 and T420i Hardware Maintenance Manual
Safety information
ThinkPad T420 and T420i Hardware Maintenance Manual
Safety information
ThinkPad T420 and T420i Hardware Maintenance Manual
Laser compliance statement multilingual translations
ThinkPad T420 and T420i Hardware Maintenance Manual
Safety information
ThinkPad T420 and T420i Hardware Maintenance Manual
Safety information
ThinkPad T420 and T420i Hardware Maintenance Manual
Strategy for replacing a hard disk drive
Important service information
Before replacing parts
Strategy for replacing FRUs
Important notice for replacing a system board
How to use error message
Custom Model Variant CMV
Dynamic Configure To Order CTO
Using PEW
FRU identification for CTO, CMV, and GAV products
ThinkPad T420 and T420i Hardware Maintenance Manual
General checkout
What to do first
Following are not covered under warranty
Checkout guide
Diagnostics using PC-Doctor for DOS
Options on the test menu are as follows
Diagnostics Interactive Tests
Utility
Lenovo ThinkVantage Toolbox
Windows
Hardware Info
ThinkPad T420 and T420i Hardware Maintenance Manual
FRU tests
Pin Voltage V dc
Power system checkout
Checking the ac power adapter
Checking operational charging
Checking the backup battery
Checking the battery pack
Terminal Voltage V dc
Wire Voltage V dc
Restoring the factory contents by using Recovery Disc Set
Related service information
Power-on password
Passwords
Hard-disk password
Select Power-On Password
Supervisor password
How to remove the power-on password
How to remove the hard-disk password
Select Master HDP
Hibernation mode
Power management
Screen blank mode
Sleep standby mode
ThinkPad T420 and T420i Hardware Maintenance Manual
Numeric error codes
Symptom-to-FRU index
0271 Run the ThinkPad Setup program to reset the time
0199 Run the ThinkPad Setup program, and then save
0251 Charge the backup battery for more than 8 hours
By connecting the ac power adapter
Fan
Error messages
Symptom or error FRU or action, in sequence
Replace the battery
No-beep symptoms
Beep symptoms
LCD-related symptoms
See important note for LCD-related symptoms
Reseat the LCD connectors
LCD assembly
Undetermined problems
Intermittent problems
Status indicators
Indicator Meaning
Blinking green
Indicator Meaning
Battery status indicator blinks three times
Green
Battery status indicator is off
Key combination Description
Fn key combinations
For Windows
For Windows Vista and Windows XP
Fn key combinations
ThinkPad T420 and T420i Hardware Maintenance Manual
Plastic to plastic
FRU replacement notices
Screw notices
External CRU statement to customers
Select 2. Read S/N data from Eeprom
Retaining serial numbers
Restoring the serial number of the system unit
Torque driver
Product ID on rear label
Retaining the Uuid
Reading or writing the ECA information
MTM on rear label
ThinkPad T420 and T420i Hardware Maintenance Manual
Removing and replacing a FRU
Before servicing ThinkPad T420 and T420i
Important notice for replacing a battery pack
Battery pack
Removal steps of ExpressCard blank bezel
ExpressCard blank bezel
Serial Ultrabay Enhanced device or travel bezel
Removal steps of hard disk drive and solid state drive
Hard disk drive HDD and solid state drive SSD
Removing and replacing a FRU
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of Dimm slot cover
Dimm slot cover
Dimm in the slot on the underside of the computer
Removal steps of PCI Express Mini Card for wireless WAN
PCI Express Mini Card for wireless WAN
Step Screw quantity Color Torque
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of keyboard
Keyboard
Installation steps of keyboard
Removing and replacing a FRU
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of Dimm in the slot under the keyboard
Dimm in the slot under the keyboard
ThinkPad T420 and T420i Hardware Maintenance Manual
Backup battery
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of PCI Express Mini Card for wireless LAN
PCI Express Mini Card for wireless LAN
When installing
Step Screw quantity Color Torque
Step Screw quantity Color Torque
Removing and replacing a FRU
M2 × 3 mm, wafer-head, nylon-coated Black 181 Nm Kgfcm
Removing and replacing a FRU
Removal steps of SmartCard
SmartCard
Removal steps of SmartCard dummy spacer
Removal steps of modem daughter card MDC
Modem daughter card MDC
Removal steps of speaker assembly
Speaker assembly
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of LCD unit
LCD unit
M2 × 3 mm, wafer-head, nylon-coated Black 181 Nm Kgfcm
When installing
ThinkPad T420 and T420i Hardware Maintenance Manual
Fan assembly
Step Screw quantity Color Torque
For Discrete Graphics models For Integrated Graphics models
For Integreted Graphics models When installing
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of CPU
1180 CPU
Base cover assembly and DC-in connector cable
M2 × 5 mm, wafer-head, nylon-coated Black 181 Nm Kgfcm
M2 × 3 mm, wafer-head, nylon-coated Black 181 Nm Kgfcm
Removing and replacing a FRU
Removal steps of magnesium structure frame
Magnesium structure frame
Removing and replacing a FRU
Removal steps of system board and ExpressCard slot assembly
System board and ExpressCard slot assembly
Important notices for handling the system board
Removing and replacing a FRU
MSATA solid state drive
Removal steps of mSATA solid state drive
Removal steps of LCD bezel assembly
LCD bezel assembly
Removal steps of LED board
LED board
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of integrated camera
Integrated camera
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of LCD panel and LCD cable
LCD panel and LCD cable
ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of camera cable
Camera cable
ThinkPad T420 and T420i Hardware Maintenance Manual
Step Screw quantity Color Torque
Removal steps of hinges and LCD rear cover assembly
Hinges and LCD rear cover assembly
Removing and replacing a FRU
ThinkPad T420 and T420i Hardware Maintenance Manual
Front view
Locations
125
ThinkPad T420 and T420i Hardware Maintenance Manual
Rear view
Bottom view
129
Parts list
External CRU statement to customers
Overall
CRU ID
CRU ID
FRU Overall FRU no
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU ID
CRU
LCD FRUs
Camera module 60Y9994
No. FRU FRU no
FRU
FRU
Language FRU no
CRU
Miscellaneous parts
FRU
Information about ac power adapters
Country or region FRU no
Power cords
Language
Recovery discs
Windows XP Professional DVDs
Windows Vista Business 32 bit SP2 DVDs
US English 04T1312
Windows Vista Home Basic 32 bit SP2 DVDs
Windows 7 Professional 32 bit DVDs
Windows 7 Professional 64 bit DVDs
Parts list-Windows 7 Professional 64 bit recovery DVDs
Windows 7 Home Premium 32 bit DVDs
Windows 7 Home Basic 32 bit DVDs
Windows 7 Home Premium 64 bit DVDs
US English 04T1349
Windows 7 Ultimate 32 bit DVDs
Windows 7 Ultimate 64 bit DVDs
US English 04T1321
Tool
Common service tools
167
Appendix A. Notices
Electronic emissions notices
Trademarks
ThinkPad T420 and T420i Hardware Maintenance Manual
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