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Lenovo T420i manual Status indicators

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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Chapter 5. Status indicators

This chapter presents the system status indicators that show the status of the computer.

© Copyright Lenovo 2011

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Lenovo T420i manual Status indicators

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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 informationBefore 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 CTOUsing 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 ToolboxWindows Hardware Info ThinkPad T420 and T420i Hardware Maintenance Manual FRU tests Pin Voltage V dc Power system checkoutChecking the ac power adapter Checking operational charging 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 Select Power-On Password Supervisor passwordHow to remove the power-on password How to remove the hard-disk password Select Master HDP Hibernation mode Power managementScreen 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 save0251 Charge the backup battery for more than 8 hours By connecting the ac power adapter Fan Error messagesSymptom or error FRU or action, in sequence Replace the battery 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 Blinking green Indicator MeaningBattery status indicator blinks three times 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 Plastic to plastic FRU replacement noticesScrew notices External CRU statement to customers Select 2. Read S/N data from Eeprom Retaining serial numbersRestoring the serial number of the system unit Torque driver Product ID on rear label Retaining the UuidReading 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 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 Language Recovery discsWindows XP Professional DVDs Windows Vista Business 32 bit SP2 DVDs US English 04T1312 Windows Vista Home Basic 32 bit SP2 DVDsWindows 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 DVDsWindows 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 Page 0A6000703

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