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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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124ThinkPad 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 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 Strategy for replacing FRUs Important service informationBefore replacing parts Strategy for replacing a hard disk drive How to use error message Important notice for replacing a system board FRU identification for CTO, CMV, and GAV products Dynamic Configure To Order CTOUsing PEW 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 Hardware Info Lenovo ThinkVantage ToolboxWindows Utility ThinkPad T420 and T420i Hardware Maintenance Manual FRU tests Checking operational charging Power system checkoutChecking the ac power adapter Pin Voltage V dc Checking the backup battery Checking the battery packTerminal Voltage V dc Wire Voltage V dc Related service information Restoring the factory contents by using Recovery Disc Set Power-on password PasswordsHard-disk password How to remove the hard-disk password Supervisor passwordHow to remove the power-on password Select Power-On Password Select Master HDP Sleep standby mode Power managementScreen blank mode Hibernation mode ThinkPad T420 and T420i Hardware Maintenance Manual Symptom-to-FRU index Numeric error codes By connecting the ac power adapter 0199 Run the ThinkPad Setup program, and then save0251 Charge the backup battery for more than 8 hours 0271 Run the ThinkPad Setup program to reset the time Replace the battery Error messagesSymptom or error FRU or action, in sequence Fan No-beep symptoms Beep symptomsLCD-related symptoms See important note for LCD-related symptoms Reseat the LCD connectorsLCD assembly Intermittent problems Undetermined problems Status indicators Indicator Meaning Green Indicator MeaningBattery status indicator blinks three times 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 External CRU statement to customers FRU replacement noticesScrew notices Plastic to plastic Torque driver Retaining serial numbersRestoring the serial number of the system unit Select 2. Read S/N data from Eeprom MTM on rear label Retaining the UuidReading or writing the ECA information 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 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 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 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 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 Front view Locations125 ThinkPad T420 and T420i Hardware Maintenance Manual Rear view Bottom view 129 Parts listExternal CRU statement to customers 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 Windows Vista Business 32 bit SP2 DVDs Recovery discsWindows XP Professional DVDs Language Windows 7 Professional 64 bit DVDs Windows Vista Home Basic 32 bit SP2 DVDsWindows 7 Professional 32 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 US English 04T1321 Windows 7 Ultimate 32 bit DVDsWindows 7 Ultimate 64 bit DVDs 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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