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Lenovo T420i manual Lift the keyboard a little in the direction shown by arrow

Models: T420i T420

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Lift the keyboard a little in the direction shown by arrow

Lift the keyboard a little in the direction shown by arrow

3 , and then detach the connector

4.

Installation steps of keyboard

When installing the keyboard, do the following: 1. Attach the keyboard connector.

74ThinkPad T420 and T420i Hardware Maintenance Manual

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Lenovo T420i manual Lift the keyboard a little in the direction shown by arrow, 3 , and then detach the connector

Contents

ThinkPad T420 and T420i Hardware Maintenance Manual Fourth Edition November Copyright Lenovo Contents Chapter 10. Parts list Wireless LAN antenna assembly or wirelessii ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 9. LocationsAbout this manual iv ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 1. Safety information General safetyElectrical safety Safety inspection guide Handling devices that are sensitive to electrostatic dischargeGrounding requirements Safety notices multilingual translations DANGERDANGER DANGER6 ThinkPad T420 and T420i Hardware Maintenance Manual DANGERDANGER DANGERChapter 1. Safety information PERIGOPERIGO PERIGOPERIGO PERIGOPERIGO DANGERDANGER DANGERDANGER DANGERDANGER DANGERVORSICHT VORSICHTVORSICHT VORSICHT12 ThinkPad T420 and T420i Hardware Maintenance Manual 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 16 ThinkPad T420 and T420i Hardware Maintenance Manual Korean Spanish Traditional Chinese Laser compliance statement multilingual translationsEnglish Arabic Brazilian Portuguese French German Hebrew Japanese 18 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 1. Safety information 20 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 1. Safety information 22 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 2. Important service information Strategy for replacing FRUsStrategy for replacing a hard disk drive Before replacing parts24 ThinkPad T420 and T420i Hardware Maintenance Manual How to use error messageImportant notice for replacing a system board Strategy for replacing FRUs for CTO, CMV, and GAV Product definition FRU identification for CTO, CMV, and GAV productsDynamic Configure To Order CTO Using PEWTo view the key commodities, do the following 1. Click Products & Service Warranty 2. Click Check Warranty StatusUsing the HMM Chapter 3. General checkout “Diagnostics using PC-Doctor for DOS” on page“Power system checkout” on page This chapter presents following informationWhat to do first The following are not covered under warrantyCheckout guide Diagnostics using PC-Doctor for DOSTesting the computer If an error code appears, go to “Symptom-to-FRU index” on page Lenovo ThinkVantage Toolbox Detecting system information with PC-DoctorWindows Windows VistaR and Windows XP32 ThinkPad T420 and T420i Hardware Maintenance Manual Table 1. FRU tests FRU testsThe following table shows the test for each FRU Checking operational charging Power system checkoutChecking the ac power adapter Checking the battery pack Checking the backup batteryIf the voltage is correct, replace the system board If the voltage is not correct, replace the backup battery36 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 4. Related service information Restoring the factory contents by using Recovery Disc SetOperating System Recovery Disc one disc Applications and Drivers Recovery Disc one or more discsPasswords Power-on passwordHard-disk password 2. Insert the Operating System Recovery Disc into the DVD driveSupervisor password How to remove the power-on passwordHow to remove the hard-disk password B If an SVP has been set and is known by the service technician40 ThinkPad T420 and T420i Hardware Maintenance Manual 6. Select Master HDPPower management Screen blank modeSleep standby mode Hibernation modeThe system is powered off Symptom-to-FRU index Numeric error codesPlace the ThinkPad Notebook on a horizontal surface Table 2. Numeric error codes continued44 ThinkPad T420 and T420i Hardware Maintenance Manual Error messages Table 3. Error messagesBeep symptoms No-beep symptomsLCD-related symptoms Table 4. Beep symptomsTable 6. LCD-related symptoms Symptom or errorReseat the LCD connectors See important note for “LCD-related symptoms.”48 ThinkPad T420 and T420i Hardware Maintenance Manual Intermittent problemsUndetermined problems Chapter 5. Status indicators Status indicators Indicatoravailable while the microphone mute is on by default Wireless LAN, Wireless WANTable 7. Status indicators continued The battery is being charged. When it reaches 20%, the blinkingthe battery status indicator stops blinking, but the charging may Chapter 5. Status indicatorsTable 7. Status indicators continued The ac power adapter is attached to the computerChapter 6. Fn key combinations Table 8. Fn key combinationsKey combination DescriptionTable 8. Fn key combinations continued Table 8. Fn key combinations continued Fn+PrtSc56 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 7. FRU replacement notices Screw noticesExternal CRU statement to customers Plastic to plasticRetaining serial numbers Restoring the serial number of the system unitTorque driver 3. Select 2. Read S/N data from EEPROMRetaining the UUID Reading or writing the ECA informationMTM on rear label Product ID on rear label60 ThinkPad T420 and T420i Hardware Maintenance Manual DANGER Chapter 8. Removing and replacing a FRUExternal CRU statement to customers Before servicing ThinkPad T420 and T420i 62 ThinkPad T420 and T420i Hardware Maintenance ManualRemoval steps of battery pack DANGER 1010 Battery packImportant notice for replacing a battery pack 1020 ExpressCard blank bezel Removal steps of ExpressCard blank bezel1030 Serial Ultrabay Enhanced device or travel bezel Removal steps of Serial Ultrabay Enhanced device or travel bezel1040 Hard disk drive HDD and solid state drive SSD Removal steps of hard disk drive and solid state driveFor HDD and HDD rubber rails 9.5 mm For HDD and HDD rubber rails 7.0mmFor SSD and spacers Chapter 8. Removing and replacing a FRU68 ThinkPad T420 and T420i Hardware Maintenance Manual 1050 DIMM slot cover Removal steps of DIMM slot cover1060 DIMM in the slot on the underside of the computer Removal steps of DIMM in the slot on the underside of the computer1070 PCI Express Mini Card for wireless WAN Removal steps of PCI Express Mini Card for wireless WAN72 ThinkPad T420 and T420i Hardware Maintenance Manual 1080 Keyboard Removal steps of keyboardLift the keyboard a little in the direction shown by arrow 3 , and then detach the connectorInstallation steps of keyboard Chapter 8. Removing and replacing a FRU 4. Make sure that the front edge of the keyboard is attached firmly1090 DIMM in the slot under the keyboard Removal steps of DIMM in the slot under the keyboard78 ThinkPad T420 and T420i Hardware Maintenance Manual 1100 Backup battery Removal steps of backup battery DANGER80 ThinkPad T420 and T420i Hardware Maintenance Manual 1110 PCI Express Mini Card for wireless LAN Removal steps of PCI Express Mini Card for wireless LANWhen installing 82 ThinkPad T420 and T420i Hardware Maintenance Manual1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card 84 ThinkPad T420 and T420i Hardware Maintenance Manual StepScrew quantity ColorWhen installing Make sure that the connector is attached firmly Chapter 8. Removing and replacing a FRUWhen installing Make sure that the connectors are attached firmly 86 ThinkPad T420 and T420i Hardware Maintenance ManualWhen installing Make sure that the connector is attached firmly Chapter 8. Removing and replacing a FRU1130 SmartCard Removal steps of SmartCardWhen installing Make sure that the connector is attached firmly Removal steps of SmartCard dummy spacer1140 Modem daughter card MDC Removal steps of modem daughter card MDC1150 Speaker assembly Removal steps of speaker assembly92 ThinkPad T420 and T420i Hardware Maintenance Manual 1160 LCD unit Removal steps of LCD unit94 ThinkPad T420 and T420i Hardware Maintenance Manual StepScrew quantity ColorWhen installing Make sure that you attach the connectors firmly96 ThinkPad T420 and T420i Hardware Maintenance Manual 1170 Fan assembly Removal steps of fan assemblyFor Discrete Graphics models For Integreted Graphics models1a 1d 1c 1b 98 ThinkPad T420 and T420i Hardware Maintenance ManualFor Discrete Graphics models For Integrated Graphics models For Integreted Graphics models When installingFor Discrete Graphics models Make sure that the fan connector is attached firmly 1180 CPU Removal steps of CPU1190 Base cover assembly and DC-in connector cable Removal steps of base cover assembly and DC-in connector cableWhen installing Make sure that the connector is attached firmly StepScrew quantity ColorNote Applying labels to the base cover Wireless WAN MAC address label China mobile IMEI label 1200 Magnesium structure frame Removal steps of magnesium structure frameM2 × 8 mm, wafer-head, nylon-coated Black0.181 Nm 1.85 kgfcm1210 System board and ExpressCard slot assembly Removal steps of system board and ExpressCard slot assemblyGraphic Processing Unit GPU Discrete graphics chip For Switchable Graphics models For Integrated Graphics modelsPlatform Controller Hub PCH 1220 mSATA solid state drive 110 ThinkPad T420 and T420i Hardware Maintenance ManualRemoval steps of mSATA solid state drive StepScrew quantity Color2010 LCD bezel assembly Removal steps of LCD bezel assembly2020 LED board Removal steps of LED boardWhen installing Make sure that the connector is attached firmly 114 ThinkPad T420 and T420i Hardware Maintenance Manual2030 Integrated camera Removal steps of integrated camera116 ThinkPad T420 and T420i Hardware Maintenance Manual 2040 LCD panel and LCD cable Removal steps of LCD panel and LCD cableWhen installing Make sure that the connector is attached firmly 118 ThinkPad T420 and T420i Hardware Maintenance Manual2050 Camera cable Removal steps of camera cable120 ThinkPad T420 and T420i Hardware Maintenance Manual Step Screw quantityColor Torque2070 Hinges and LCD rear cover assembly Removal steps of hinges and LCD rear cover assemblyChapter 8. Removing and replacing a FRU 124 ThinkPad T420 and T420i Hardware Maintenance Manual Chapter 9. Locations Front view126 ThinkPad T420 and T420i Hardware Maintenance Manual Rear view Status indicatorsDisplayPort connector USB connector RJ-45 Ethernet connector External monitor connector Power jack USB connectorLCD cover latch Bottom viewBattery 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 pageOverall 130 ThinkPad T420 and T420i Hardware Maintenance ManualParts list-Overall ThinkPad b/g/n Wireless 1x1 BGNIntel Centrino Wireless-N FRU OverallTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 134 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 136 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 138 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 140 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 142 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 144 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 146 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDTable 9. Parts list-Overall continued 148 ThinkPad T420 and T420i Hardware Maintenance ManualFRU Overall FRU noTable 9. Parts list-Overall continued FRU OverallFRU no CRU IDLCD FRUs Table 10. Parts list-LCD FRUsLCD bezel assembly FRU noTable 10. Parts list-LCD FRUs continued No. FRUFRU no 2 Camera moduleFRU no Table 10. Parts list-LCD FRUs continued152 ThinkPad T420 and T420i Hardware Maintenance Manual Table 10. Parts list-LCD FRUs continued FRU noKeyboard Table 11. Parts list-KeyboardTable 11. Parts list-Keyboard continued Netherlands45N2090 45N2160Miscellaneous parts Table 12. Parts list-Miscellaneous partsTable 12. Parts list-Miscellaneous parts continued FRU noTable 14. Parts list-3-pin ac power adapters Information about ac power adaptersTable 13. Parts list-2-pin ac power adapters Table 16. Parts list-3-pin power cords Power cordsTable 15. Parts list-2-pin power cords Windows Vista Business 32 bit SP2 DVDs Recovery discsWindows XP Professional DVDs Table 20. Parts list-Windows 7 Professional 32 bit recovery DVDs Windows Vista Home Basic 32 bit SP2 DVDsWindows 7 Professional 32 bit DVDs Windows 7 Professional 64 bit DVDs4179-CTO, GBx, GEx Windows 7 Home Basic 32 bit DVDs Windows 7 Home Premium 32 bit DVDsTable 23. Parts list-Windows 7 Home Premium 32 bit recovery DVDs Table 24. Parts list-Windows 7 Home Premium 64 bit recovery DVDsWindows 7 Home Premium 64 bit DVDs 4178-CTO, 9Fx, 9Nx, A6x, BWx, CLx, CMx, CNx 4179-CTO, GMx, GNxTable 25. Parts list-Windows 7 Ultimate 32 bit recovery DVDs Table 26. Parts list-Windows 7 Ultimate 64 bit recovery DVDsWindows 7 Ultimate 32 bit DVDs Windows 7 Ultimate 64 bit DVDsCommon service tools Table 27. Parts list-Common service toolsMorrisville, NC U.S.A Attention Lenovo Director of Licensing Appendix A. NoticesLenovo United States, Inc 1009 Think Place - Building One Electronic emissions notices 168 ThinkPad T420 and T420i Hardware Maintenance ManualTrademarks 170 ThinkPad T420 and T420i Hardware Maintenance Manual Page 0A6000703 Part Number 0A6000703 1P P/N 0A6000703