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Lenovo manual ThinkPad T420 and T420i Hardware Maintenance Manual

Models: T420i T420

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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

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170ThinkPad T420 and T420i Hardware Maintenance Manual

Page 175 Page 177

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Lenovo manual ThinkPad T420 and T420i Hardware Maintenance Manual

Page 175 Page 177

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Contents

ThinkPad T420 and T420i Hardware Maintenance Manual Fourth Edition November Copyright Lenovo Contents Locations 125 About this manual Iii Iv ThinkPad T420 and T420i Hardware Maintenance Manual Safety information General safety 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 Important service information Before replacing partsStrategy for replacing FRUs Strategy for replacing a hard disk drive How to use error message Important notice for replacing a system board Dynamic Configure To Order CTO Using PEWFRU identification for CTO, CMV, and GAV products Custom Model Variant CMV ThinkPad T420 and T420i Hardware Maintenance Manual General checkout Following are not covered under warranty What to do first Diagnostics using PC-Doctor for DOS Checkout guide Diagnostics Interactive Tests Options on the test menu are as follows Lenovo ThinkVantage Toolbox WindowsHardware Info Utility ThinkPad T420 and T420i Hardware Maintenance Manual FRU tests Power system checkout Checking the ac power adapterChecking operational charging Pin Voltage V dc Terminal Voltage V dc Checking the battery packChecking the backup battery Wire Voltage V dc Related service information Restoring the factory contents by using Recovery Disc Set Hard-disk password PasswordsPower-on password Supervisor password How to remove the power-on passwordHow to remove the hard-disk password Select Power-On Password Select Master HDP Power management Screen blank modeSleep standby mode Hibernation mode ThinkPad T420 and T420i Hardware Maintenance Manual Symptom-to-FRU index Numeric error codes 0199 Run the ThinkPad Setup program, and then save 0251 Charge the backup battery for more than 8 hoursBy connecting the ac power adapter 0271 Run the ThinkPad Setup program to reset the time Error messages Symptom or error FRU or action, in sequenceReplace the battery Fan LCD-related symptoms Beep symptomsNo-beep symptoms LCD assembly Reseat the LCD connectorsSee important note for LCD-related symptoms Intermittent problems Undetermined problems Status indicators Indicator Meaning Indicator Meaning Battery status indicator blinks three timesGreen Blinking green Battery status indicator is off For Windows Fn key combinationsKey combination Description For Windows Vista and Windows XP Fn key combinations ThinkPad T420 and T420i Hardware Maintenance Manual FRU replacement notices Screw noticesExternal CRU statement to customers Plastic to plastic Retaining serial numbers Restoring the serial number of the system unitTorque driver Select 2. Read S/N data from Eeprom Retaining the Uuid Reading or writing the ECA informationMTM on rear label Product ID on rear label ThinkPad T420 and T420i Hardware Maintenance Manual Removing and replacing a FRU Before servicing ThinkPad T420 and T420i Battery pack Important notice for replacing a battery pack ExpressCard blank bezel Removal steps of ExpressCard blank bezel Serial Ultrabay Enhanced device or travel bezel Hard disk drive HDD and solid state drive SSD Removal steps of hard disk drive and solid state drive Removing and replacing a FRU ThinkPad T420 and T420i Hardware Maintenance Manual Dimm slot cover Removal steps of Dimm slot cover Dimm in the slot on the underside of the computer Step Screw quantity Color Torque PCI Express Mini Card for wireless WANRemoval steps of PCI Express Mini Card for wireless WAN ThinkPad T420 and T420i Hardware Maintenance Manual Keyboard Removal steps of keyboard Installation steps of keyboard Removing and replacing a FRU ThinkPad T420 and T420i Hardware Maintenance Manual Dimm in the slot under the keyboard Removal steps of Dimm in the slot under the keyboard ThinkPad T420 and T420i Hardware Maintenance Manual Backup battery ThinkPad T420 and T420i Hardware Maintenance Manual PCI Express Mini Card for wireless LAN Removal steps of 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 SmartCard Removal steps of SmartCard Removal steps of SmartCard dummy spacer Modem daughter card MDC Removal steps of modem daughter card MDC Speaker assembly Removal steps of speaker assembly ThinkPad T420 and T420i Hardware Maintenance Manual LCD unit Removal steps of 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 Integreted Graphics models When installing For Discrete Graphics models For Integrated Graphics models ThinkPad T420 and T420i Hardware Maintenance Manual 1180 CPU Removal steps of 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 Magnesium structure frame Removal steps of magnesium structure frame Removing and replacing a FRU Important notices for handling the system board System board and ExpressCard slot assemblyRemoval steps of system board and ExpressCard slot assembly Removing and replacing a FRU MSATA solid state drive Removal steps of mSATA solid state drive LCD bezel assembly Removal steps of LCD bezel assembly LED board Removal steps of LED board ThinkPad T420 and T420i Hardware Maintenance Manual Integrated camera Removal steps of integrated camera ThinkPad T420 and T420i Hardware Maintenance Manual LCD panel and LCD cable Removal steps of LCD panel and LCD cable ThinkPad T420 and T420i Hardware Maintenance Manual Camera cable Removal steps of camera cable ThinkPad T420 and T420i Hardware Maintenance Manual Step Screw quantity Color Torque Hinges and LCD rear cover assembly Removal steps of hinges and LCD rear cover assembly Removing and replacing a FRU ThinkPad T420 and T420i Hardware Maintenance Manual 125 LocationsFront view ThinkPad T420 and T420i Hardware Maintenance Manual Rear view Bottom view External CRU statement to customers Parts list129 Overall 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 ID LCD FRUs CRU No. FRU FRU no Camera module 60Y9994 FRU FRU Language FRU no CRU Miscellaneous parts FRU Information about ac power adapters Power cords Country or region FRU no Recovery discs Windows XP Professional DVDsWindows Vista Business 32 bit SP2 DVDs Language Windows Vista Home Basic 32 bit SP2 DVDs Windows 7 Professional 32 bit DVDsWindows 7 Professional 64 bit DVDs US English 04T1312 Parts list-Windows 7 Professional 64 bit recovery DVDs Windows 7 Home Basic 32 bit DVDs Windows 7 Home Premium 32 bit DVDs Windows 7 Home Premium 64 bit DVDs Windows 7 Ultimate 32 bit DVDs Windows 7 Ultimate 64 bit DVDsUS English 04T1321 US English 04T1349 Common service tools Tool Appendix A. Notices 167 Electronic emissions notices Trademarks ThinkPad T420 and T420i Hardware Maintenance Manual Page 0A6000703

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