ThinkPad T420 and T420i Hardware Maintenance Manual
Fourth Edition November Copyright Lenovo
Contents
Chapter 10. Parts list
Wireless LAN antenna assembly or wireless
ii ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 9. Locations
About this manual
iv ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
General safety
Electrical safety
Safety inspection guide
Handling devices that are sensitive to electrostatic discharge
Grounding requirements
Safety notices multilingual translations
DANGER
DANGER
DANGER
6 ThinkPad T420 and T420i Hardware Maintenance Manual
DANGER
DANGER
DANGER
Chapter 1. Safety information
PERIGO
PERIGO
PERIGO
PERIGO
PERIGO
PERIGO
DANGER
DANGER
DANGER
DANGER
DANGER
DANGER
DANGER
VORSICHT
VORSICHT
VORSICHT
VORSICHT
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Chapter 1. Safety information
14 ThinkPad T420 and T420i Hardware Maintenance Manual
Antes de encender el sistema despues de sustituir una FRU, compruebe que todos los tornillos, muelles y demás piezas pequeñas se encuentran en su sitio y no se encuentran sueltas dentro del sistema. Compruébelo agitando el sistema y escuchando los posibles ruidos que provocarían. Las piezas metálicas pueden causar cortocircuitos eléctricos
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Korean Spanish Traditional Chinese
Laser compliance statement multilingual translations
English Arabic Brazilian Portuguese French German Hebrew Japanese
18 ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
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Chapter 1. Safety information
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Chapter 2. Important service information
Strategy for replacing FRUs
Strategy for replacing a hard disk drive
Before replacing parts
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How to use error message
Important notice for replacing a system board
Strategy for replacing FRUs for CTO, CMV, and GAV Product definition
FRU identification for CTO, CMV, and GAV products
Dynamic Configure To Order CTO
Using PEW
To view the key commodities, do the following
1. Click Products & Service Warranty 2. Click Check Warranty Status
Using the HMM
Chapter 3. General checkout
“Diagnostics using PC-Doctor for DOS” on page
“Power system checkout” on page
This chapter presents following information
What to do first
The following are not covered under warranty
Checkout guide
Diagnostics using PC-Doctor for DOS
Testing the computer
If an error code appears, go to “Symptom-to-FRU index” on page
Lenovo ThinkVantage Toolbox
Detecting system information with PC-Doctor
Windows
Windows VistaR and Windows XP
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Table 1. FRU tests
FRU tests
The following table shows the test for each FRU
Checking operational charging
Power system checkout
Checking the ac power adapter
Checking the battery pack
Checking the backup battery
If the voltage is correct, replace the system board
If the voltage is not correct, replace the backup battery
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Chapter 4. Related service information
Restoring the factory contents by using Recovery Disc Set
Operating System Recovery Disc one disc
Applications and Drivers Recovery Disc one or more discs
Passwords
Power-on password
Hard-disk password
2. Insert the Operating System Recovery Disc into the DVD drive
Supervisor password
How to remove the power-on password
How to remove the hard-disk password
B If an SVP has been set and is known by the service technician
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6. Select Master HDP
Power management
Screen blank mode
Sleep standby mode
Hibernation mode
The system is powered off
Symptom-to-FRU index
Numeric error codes
Place the ThinkPad Notebook on a horizontal surface
Table 2. Numeric error codes continued
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Error messages
Table 3. Error messages
Beep symptoms
No-beep symptoms
LCD-related symptoms
Table 4. Beep symptoms
Table 6. LCD-related symptoms
Symptom or error
Reseat the LCD connectors
See important note for “LCD-related symptoms.”
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Intermittent problems
Undetermined problems
Chapter 5. Status indicators
Status indicators
Indicator
available while the microphone mute is on by default
Wireless LAN, Wireless WAN
Table 7. Status indicators continued
The battery is being charged. When it reaches 20%, the blinking
the battery status indicator stops blinking, but the charging may
Chapter 5. Status indicators
Table 7. Status indicators continued
The ac power adapter is attached to the computer
Chapter 6. Fn key combinations
Table 8. Fn key combinations
Key combination
Description
Table 8. Fn key combinations continued
Table 8. Fn key combinations continued
Fn+PrtSc
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Chapter 7. FRU replacement notices
Screw notices
External CRU statement to customers
Plastic to plastic
Retaining serial numbers
Restoring the serial number of the system unit
Torque driver
3. Select 2. Read S/N data from EEPROM
Retaining the UUID
Reading or writing the ECA information
MTM on rear label
Product ID on rear label
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DANGER
Chapter 8. Removing and replacing a FRU
External CRU statement to customers
Before servicing ThinkPad T420 and T420i
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Removal steps of battery pack DANGER
1010 Battery pack
Important notice for replacing a battery pack
1020 ExpressCard blank bezel
Removal steps of ExpressCard blank bezel
1030 Serial Ultrabay Enhanced device or travel bezel
Removal steps of Serial Ultrabay Enhanced device or travel bezel
1040 Hard disk drive HDD and solid state drive SSD
Removal steps of hard disk drive and solid state drive
For HDD and HDD rubber rails 9.5 mm
For HDD and HDD rubber rails 7.0mm
For SSD and spacers
Chapter 8. Removing and replacing a FRU
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1050 DIMM slot cover
Removal steps of DIMM slot cover
1060 DIMM in the slot on the underside of the computer
Removal steps of DIMM in the slot on the underside of the computer
1070 PCI Express Mini Card for wireless WAN
Removal steps of PCI Express Mini Card for wireless WAN
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1080 Keyboard
Removal steps of keyboard
Lift the keyboard a little in the direction shown by arrow
3 , and then detach the connector
Installation steps of keyboard
Chapter 8. Removing and replacing a FRU
4. Make sure that the front edge of the keyboard
is attached firmly
1090 DIMM in the slot under the keyboard
Removal steps of DIMM in the slot under the keyboard
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1100 Backup battery
Removal steps of backup battery DANGER
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1110 PCI Express Mini Card for wireless LAN
Removal steps of PCI Express Mini Card for wireless LAN
When installing
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1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card
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Step
Screw quantity
Color
When installing Make sure that the connector is attached firmly
Chapter 8. Removing and replacing a FRU
When installing Make sure that the connectors are attached firmly
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When installing Make sure that the connector is attached firmly
Chapter 8. Removing and replacing a FRU
1130 SmartCard
Removal steps of SmartCard
When installing Make sure that the connector is attached firmly
Removal steps of SmartCard dummy spacer
1140 Modem daughter card MDC
Removal steps of modem daughter card MDC
1150 Speaker assembly
Removal steps of speaker assembly
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1160 LCD unit
Removal steps of LCD unit
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Step
Screw quantity
Color
When installing
Make sure that you attach the connectors firmly
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1170 Fan assembly
Removal steps of fan assembly
For Discrete Graphics models
For Integreted Graphics models
1a 1d 1c 1b
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For Discrete Graphics models
For Integrated Graphics models
For Integreted Graphics models When installing
For Discrete Graphics models
Make sure that the fan connector is attached firmly
1180 CPU
Removal steps of CPU
1190 Base cover assembly and DC-in connector cable
Removal steps of base cover assembly and DC-in connector cable
When installing Make sure that the connector is attached firmly
Step
Screw quantity
Color
Note Applying labels to the base cover
Wireless WAN MAC address label China mobile IMEI label
1200 Magnesium structure frame
Removal steps of magnesium structure frame
M2 × 8 mm, wafer-head, nylon-coated
Black
0.181 Nm
1.85 kgfcm
1210 System board and ExpressCard slot assembly
Removal steps of system board and ExpressCard slot assembly
Graphic Processing Unit GPU Discrete graphics chip
For Switchable Graphics models For Integrated Graphics models
Platform Controller Hub PCH
1220 mSATA solid state drive
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Removal steps of mSATA solid state drive
Step
Screw quantity
Color
2010 LCD bezel assembly
Removal steps of LCD bezel assembly
2020 LED board
Removal steps of LED board
When installing Make sure that the connector is attached firmly
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2030 Integrated camera
Removal steps of integrated camera
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2040 LCD panel and LCD cable
Removal steps of LCD panel and LCD cable
When installing Make sure that the connector is attached firmly
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2050 Camera cable
Removal steps of camera cable
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Step
Screw quantity
Color
Torque
2070 Hinges and LCD rear cover assembly
Removal steps of hinges and LCD rear cover assembly
Chapter 8. Removing and replacing a FRU
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Chapter 9. Locations
Front view
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Rear view
Status indicators
DisplayPort connector USB connector RJ-45 Ethernet connector
External monitor connector Power jack USB connector
LCD cover latch
Bottom view
Battery pack Battery pack latch DIMM slot Docking connector
Chapter 10. Parts list
This chapter contains following lists of the service parts
“Information about ac power adapters” on page “Power cords” on page
“Recovery discs” on page “Common service tools” on page
Overall
130 ThinkPad T420 and T420i Hardware Maintenance Manual
Parts list-Overall
ThinkPad b/g/n Wireless 1x1 BGN
Intel Centrino Wireless-N
FRU Overall
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
Table 9. Parts list-Overall continued
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FRU Overall
FRU no
Table 9. Parts list-Overall continued
FRU Overall
FRU no
CRU ID
LCD FRUs
Table 10. Parts list-LCD FRUs
LCD bezel assembly
FRU no
Table 10. Parts list-LCD FRUs continued
No. FRU
FRU no
2 Camera module
FRU no
Table 10. Parts list-LCD FRUs continued
152 ThinkPad T420 and T420i Hardware Maintenance Manual
Table 10. Parts list-LCD FRUs continued
FRU no
Keyboard
Table 11. Parts list-Keyboard
Table 11. Parts list-Keyboard continued
Netherlands
45N2090
45N2160
Miscellaneous parts
Table 12. Parts list-Miscellaneous parts
Table 12. Parts list-Miscellaneous parts continued
FRU no
Table 14. Parts list-3-pin ac power adapters
Information about ac power adapters
Table 13. Parts list-2-pin ac power adapters
Table 16. Parts list-3-pin power cords
Power cords
Table 15. Parts list-2-pin power cords
Windows Vista Business 32 bit SP2 DVDs
Recovery discs
Windows XP Professional DVDs
Table 20. Parts list-Windows 7 Professional 32 bit recovery DVDs
Windows Vista Home Basic 32 bit SP2 DVDs
Windows 7 Professional 32 bit DVDs
Windows 7 Professional 64 bit DVDs
4179-CTO, GBx, GEx
Windows 7 Home Basic 32 bit DVDs
Windows 7 Home Premium 32 bit DVDs
Table 23. Parts list-Windows 7 Home Premium 32 bit recovery DVDs
Table 24. Parts list-Windows 7 Home Premium 64 bit recovery DVDs
Windows 7 Home Premium 64 bit DVDs
4178-CTO, 9Fx, 9Nx, A6x, BWx, CLx, CMx, CNx 4179-CTO, GMx, GNx
Table 25. Parts list-Windows 7 Ultimate 32 bit recovery DVDs
Table 26. Parts list-Windows 7 Ultimate 64 bit recovery DVDs
Windows 7 Ultimate 32 bit DVDs
Windows 7 Ultimate 64 bit DVDs
Common service tools
Table 27. Parts list-Common service tools
Morrisville, NC U.S.A Attention Lenovo Director of Licensing
Appendix A. Notices
Lenovo United States, Inc 1009 Think Place - Building One
Electronic emissions notices
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Trademarks
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Page
0A6000703
Part Number 0A6000703 1P P/N 0A6000703
