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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 messages Password Status indicators Wire Voltage V dc Dynamic Configure To Order CTO Symptom-to-FRU index Diagnostics Interactive Tests

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ThinkPad T420 and T420i Hardware Maintenance Manual

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Lenovo manual ThinkPad T420 and T420i Hardware Maintenance Manual

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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 Before replacing parts Important service informationStrategy for replacing FRUs Strategy for replacing a hard disk drive Important notice for replacing a system board How to use error message Using PEW Dynamic Configure To Order CTOFRU identification for CTO, CMV, and GAV products Custom Model Variant CMV 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 Windows Lenovo ThinkVantage ToolboxHardware Info Utility ThinkPad T420 and T420i Hardware Maintenance Manual FRU tests Checking the ac power adapter Power system checkoutChecking operational charging Pin Voltage V dc Checking the backup battery Checking the battery packTerminal Voltage V dc Wire Voltage V dc Restoring the factory contents by using Recovery Disc Set Related service information Power-on password PasswordsHard-disk password How to remove the power-on password Supervisor passwordHow to remove the hard-disk password Select Power-On Password Select Master HDP Screen blank mode Power managementSleep standby mode Hibernation mode ThinkPad T420 and T420i Hardware Maintenance Manual Numeric error codes Symptom-to-FRU index 0251 Charge the backup battery for more than 8 hours 0199 Run the ThinkPad Setup program, and then saveBy connecting the ac power adapter 0271 Run the ThinkPad Setup program to reset the time Symptom or error FRU or action, in sequence Error messagesReplace the battery Fan No-beep symptoms Beep symptomsLCD-related symptoms See important note for LCD-related symptoms Reseat the LCD connectorsLCD assembly Undetermined problems Intermittent problems Status indicators Indicator Meaning Battery status indicator blinks three times Indicator MeaningGreen Blinking green Battery status indicator is off Key combination Description Fn key combinationsFor Windows For Windows Vista and Windows XP Fn key combinations ThinkPad T420 and T420i Hardware Maintenance Manual Screw notices FRU replacement noticesExternal CRU statement to customers Plastic to plastic Restoring the serial number of the system unit Retaining serial numbersTorque driver Select 2. Read S/N data from Eeprom Reading or writing the ECA information Retaining the UuidMTM 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 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 WANStep 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 assemblyImportant 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 Locations125 ThinkPad T420 and T420i Hardware Maintenance Manual Rear view Bottom view 129 Parts listExternal 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 Windows XP Professional DVDs Recovery discsWindows Vista Business 32 bit SP2 DVDs Language Windows 7 Professional 32 bit DVDs Windows Vista Home Basic 32 bit SP2 DVDsWindows 7 Professional 64 bit DVDs US English 04T1312 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 Windows 7 Ultimate 64 bit DVDs Windows 7 Ultimate 32 bit DVDsUS English 04T1321 US English 04T1349 Tool Common service tools 167 Appendix A. Notices Electronic emissions notices Trademarks ThinkPad T420 and T420i Hardware Maintenance Manual Page 0A6000703

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