Lenovo T420 Maintenance Manual
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Lenovo T420 Maintenance Manual

Thinkpad t420 and t420i
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ThinkPad T420 and T420i
Hardware Maintenance Manual

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  • Page 1 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 2 Note: Before using this information and the product it supports, be sure to read the general information under Appendix A “Notices” on page 179. First Edition (February 2011) © Copyright Lenovo 2011. LENOVO products, data, computer software, and services have been developed exclusively at private expense and are sold to governmental entities as commercial items as deined by 48 C.F.R.

  • Page 3: Table Of Contents

    FRU ....63 Checkout guide ....Before servicing ThinkPad T420 and T420i . . .
  • Page 4 Trademarks ....Rear view....ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 5: About This Manual

    Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety information” on page 1 and Chapter 2 “Important service information” on page 23.
  • Page 6 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    Chapter 1. Safety information This chapter presents following safety information that you need to be familiar with before you service a ThinkPad Notebook. • “General safety” on page 1 • “Electrical safety” on page 2 • “Safety inspection guide” on page 3 •...

  • Page 8: Electrical Safety

    – Power supply units – Pumps – Blowers and fans – Motor generators – Similar units to listed above This practice ensures correct grounding of the units. • If an electrical accident occurs: ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 9: Safety Inspection Guide

    This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-ThinkPad features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without irst correcting the problem.

  • Page 10: Handling Devices That Are Sensitive To Electrostatic Discharge

    – Use the round ground prong of the ac plug on ac-operated computers. Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be veriied by a certiied electrician. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 11: Safety Notices (Multilingual Translations)

    Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese DANGER Before the computer is powered on after FRU replacement, make sure all screws, springs, and other small parts are in place and are not left loose inside the computer.
  • Page 12 Unless hot swap is allowed for the FRU being replaced, do as follows before removing it: power off the computer, unplug all power cords from electrical outlets, remove the battery pack, and disconnect any interconnecting cables. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 13 PERIGO Chapter 1 Safety information...
  • Page 14 áreas afetadas imediatamente com água durante pelo menos 15 minutos. Procure cuidados médicos se algum sintoma causado pelo luido surgir após a lavagem. PERIGO Para evitar choque elétrico, não remova a capa plástica que protege a parte inferior da placa inversora. PERIGO ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 15 Embora as principais baterias possuam baixa voltagem, uma bateria em curto-circuito ou aterrada pode produzir corrente o bastante para queimar materiais de pessoal ou inlamáveis. PERIGO A menos que uma hot swap seja permitida para a FRU que está sendo substituída, faça o seguinte antes de removê-la: desligue o computador, desconecte todos os cabos de energia das tomadas, remova o pacote de baterias e desconecte quaisquer cabos de interconexão.
  • Page 16 Die Batterie kann schwere Verbrennungen oder Verätzungen verursachen. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der Bereitschafts-oder Systembatterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 17 VORSICHT Akkus enthalten geringe Mengen von Nickel. Sie dürfen nicht zerlegt, wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist.
  • Page 18 Wenn ein Austausch der FRU bei laufendem Betrieb nicht erlaubt ist, gehen Sie beim Austausch der FRU wie folgt vor: Schalten Sie den Computer aus, ziehen Sie alle Netzkabel von den Netzsteckdosen ab, entfernen Sie den Akku und ziehen Sie alle miteinander verbundenen Kabel ab. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 21 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.
  • Page 22 Salvo que se permita el intercambio en caliente para la unidad sustituible localmente, realice lo siguiente antes de extraerla: apague el sistema, desconecte todos los cables de alimentación de las tomas de alimentación eléctrica, extraiga la batería y desconecte los cables de interconexión. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 23: Laser Compliance Statement

    Laser compliance statement (multilingual translations) The laser compliance statements in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese Chapter 1 Safety information...
  • Page 24 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 27 Chapter 1 Safety information...
  • Page 28 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 29: Chapter 2. Important Service Information

    Chapter 2. Important service information This chapter presents following important service information that applies to all machine types supported by this manual: • “Strategy for replacing FRUs” on page 23 – “Strategy for replacing a hard disk drive” on page 24 –...

  • Page 30: Strategy For Replacing A Hard Disk Drive

    Whatever causes the irst error code may also cause false error codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index for the computer you are servicing. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 31: Gav

    Strategy for replacing FRUs for CTO, CMV, and GAV Product deinition Dynamic Conigure To Order (CTO) This provides the ability for a customer to conigure an IBM ® or a Lenovo solution from an eSite, and have this coniguration sent to fulillment, where it is built and shipped directly to the customer. The machine label, Product Entitlement Warehouse (PEW), eSupport, and the HMM will load these products as the 4-digit MT and 3-digit model, where model = “CTO”...
  • Page 32 For Key Commodities (Examples - hard disk drive, system board, microprocessor, LCD, and memory) Use the HMM as a back-up to PEW and eSupport to view the complete list of FRUs at the MT Model level. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 33: Chapter 3. General Checkout

    “FRU tests” on page 33 • “Power system checkout” on page 35 The descriptions in this chapter apply to any ThinkPad model that supports the PC-Doctor ® for DOS diagnostics program. Some descriptions might not apply to your particular computer.

  • Page 34: What To Do Irst

    • Missing parts might be a symptom of unauthorized service or modiication. • If the spindle of a hard disk drive becomes noisy, it may have been subjected to excessive force, or dropped. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 35: Checkout Guide

    For some possible conigurations of the computer, PC-Doctor might not run correctly. To avoid this problem, you need to initialize the computer setup by use of the ThinkPad Setup Utility before you run PC-Doctor. To enter ThinkPad Setup Utility, do as follows: 1.
  • Page 36 • In the Keyboard test in Interactive Tests, the Fn key should be held down for at least 2 seconds; otherwise, it cannot be sensed. • Video Adapter test supports only the LCD display on the ThinkPad Notebook. If you have an external monitor attached to your computer, detach it before running PC-Doctor for DOS.

  • Page 37: Lenovo Thinkvantage Toolbox

    Detecting system information with PC-Doctor PC-Doctor can detect the following system information: Hardware Info • System Coniguration • Memory Contents • Physical Disk Drives • Logical Disk Drives • VGA Information • IDE Drive Info • PCI Information • PNPISA Info •...
  • Page 38 For additional information about this program, see the Help for the program. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 39: Fru Tests

    2. Turn on the computer. 3. While the message, “To interrupt normal startup, press the blue ThinkVangate button,” is displayed at the lower left of the screen, press F1 to enter the ThinkPad Setup Utility. 4. Using cursor keys, select HDD diagnostic program. Press enter.
  • Page 40 • Interactive Tests ➙ Mouse Touch Pad If the Touch Pad does not work, check the coniguration as speciied in the ThinkPad Setup Utility. If the Touch Pad is disabled, select Automatic to enable it. If enabling the Touch Pad does not correct the problem, continue with the following: •...

  • Page 41: Power System Checkout

    Power system checkout To verify a symptom, do the following: 1. Turn off the computer. 2. Remove the battery pack. 3. Connect the ac power adapter. 4. Check that power is supplied when you turn on the computer. 5. Turn off the computer. 6.

  • Page 42: Checking The Battery Pack

    3. Remove the battery pack (see “1010 Battery pack” on page 65). 4. Remove the backup battery (see “1100 Backup battery” on page 82). 5. Measure the voltage of the backup battery. See the following igure. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 43 Wire Voltage (V dc) +2.5 to +3.2 Black Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the backup battery. • If the backup battery discharges quickly after replacement, replace the system board. Chapter 3 General checkout...
  • Page 44 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 45: Chapter 4. Related Service Information

    Chapter 4. Related service information This chapter presents following information: • “Restoring the factory contents by using Recovery Disc Set” on page 39 • “Passwords” on page 40 • “Power management” on page 43 • “Symptom-to-FRU index” on page 45 Service Web site: When the latest maintenance diskette and the system program service diskette become available, they will be posted http://www.lenovo.com/spm.

  • Page 46: Passwords

    Note: After restoring a drive to the factory default settings, you might need to reinstall some device drivers. Passwords As many as three passwords may be needed for any ThinkPad Notebook: the power-on password (POP), the hard-disk password (HDP), and the supervisor password (SVP).

  • Page 47: Supervisor Password

    A supervisor password (SVP) protects the system information stored in the ThinkPad Setup Utility. The user must enter the SVP in order to get access to the ThinkPad Setup Utility and change the system coniguration. Attention: If the SVP has been forgotten and cannot be made available to the service technician, there is no service procedure to reset the password.
  • Page 48 7. Type the current master HDP in the Enter Current Password ield. then leave the Enter New Password ield blank, and press Enter twice. 8. Press F10. 9. Select Yes in the Setup Coniguration window. Both user HDP and master HDP will have been removed. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 49: Power Management

    Power management To reduce power consumption, the computer has three power management modes: screen blank, sleep (standby in Windows XP), and hibernation. Screen blank mode If the time set on the “Turn off monitor” timer in the operating system expires, the LCD backlight turns off. To put the computer into screen blank mode, do as follows: 1.

  • Page 50: Hibernation Mode

    When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation ile in the boot record on the hard disk drive is read, and system status is restored from the hard disk drive. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 51: Symptom-To-Fru Index

    If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to “Intermittent problems” on page 50. Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for that device. Numeric error codes Table 2.

  • Page 52: Numeric Error Codes

    2. Replace the backup battery and run ThinkPad Setup Utility to reset the time and date. 0271 Run ThinkPad Setup Utility to reset the time and date. Real-time clock error. Check date and time settings. 1802 1. Remove Mini PCI network card.

  • Page 53: Error Messages

    Error messages Table 3. Error messages Symptom or error FRU or action, in sequence Fan error. 1. Fan. 2. Thermal grease. 3. System board. Thermal sensing error. System board. This system does not support batteries that are not Replace the battery. genuine Lenovo-made or authorized.

  • Page 54: Beep Symptoms

    Two or more beeps, or a continuous beep. Operating If a mini-PCI Ethernet card is installed, conirm that Alert system starts successfully. On LAN 2 in ThinkPad Setup Utility is disabled. Three short beeps, pause, three more short beeps, and 1. DIMM.

  • Page 55: Lcd-Related Symptoms

    LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced. Notes: • This policy applies to all ThinkPad Notebooks purchased on 1 January, 2008 or later. • Lenovo will not provide replacement if the LCD is within speciication as we cannot guarantee that any replacement LCD will have zero pixel defects.

  • Page 56: Intermittent Problems

    6. If the problem does not recur, reconnect the removed devices one at a time until you ind the failing FRU. 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): a. System board b. LCD assembly ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 57: Chapter 5. Status Indicators

    Chapter 5. Status indicators This chapter presents the system status indicators that show the status of the computer. © Copyright Lenovo 2011...
  • Page 58 When this indicator is on, do not put the computer into sleep (standby) mode or turn off the computer. Note: Do not move the system while the green device access light is on. Sudden physical shock could cause drive errors. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 59 Table 7. Status indicators (continued) Indicator Meaning Power on Green: The computer is on and ready to use. This indicator stays lit around the power-on button whenever the computer is on and is not in sleep (standby) mode. Note: This indicator blinks when the computer is in sleep mode. Numeric lock (On-screen By default, when the numeric lock is on, the numeric lock indicator is indicator)
  • Page 60 The battery pack of the computer is fully charged or detached. Sleep (standby for Windows Green: XP) status The computer is in sleep (standby) mode. Blinking green: The computer is entering sleep (standby) mode or hibernation mode, or is resuming normal operation. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 61: Chapter 6. Fn Key Combinations

    (power scheme) appears. Notes: To use this combination of the keys, ThinkPad PM device driver must have been installed on the computer. If you have logged on with an administrator user ID in Windows XP, and you press Fn+F3, the panel for selecting a power scheme appears.
  • Page 62 Put the computer into hibernation mode. To return to normal operation, press the power button for less than four seconds. Notes: To use this combination of the keys, ThinkPad PM device driver must have been installed on the computer. Though the screen fades out immediately after Fn+F12 are pressed, the computer does not enter the hibernation mode immediately.
  • Page 63 Table 8. Fn key combinations (continued) Key combination Description Fn+Home The computer display becomes brighter. The purpose of this method is to change the brightness level temporarily. On Windows Vista, the default brightness level is loaded after sleep (standby), hibernation, reboot, or detaching or attaching an ac power adapter.
  • Page 64 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 65: Chapter 7. Fru Replacement Notices

    This chapter presents notices related to removing and replacing parts. Read this chapter carefully before replacing any FRU. Screw notices Loose screws can cause a reliability problem. In the ThinkPad Notebook, this problem is addressed with special nylon-coated screws that have the following characteristics: • They maintain tight connections.

  • Page 66: Retaining Serial Numbers

    If you replace the system board, you must restore the serial number of the system unit to its original value. Before replacing the system board, save the original serial number by doing the following: 1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer.

  • Page 67: Reading Or Writing The Eca Information

    When you replace the system board, you must set the UUID on the new system board as follows: 1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer. 2. From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID already exists, it is not overwritten.
  • Page 68 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 69: Chapter 8. Removing And Replacing A Fru

    Chapter 8. Removing and replacing a FRU This chapter presents directions and drawings for use in removing and replacing a FRU. Be sure to observe the following general rules: 1. Do not try to service any computer unless you have been trained and certiied. An untrained person runs the risk of damaging parts.

  • Page 70: Before Servicing Thinkpad T420 And T420I

    Before servicing ThinkPad T420 and T420i Some models of the ThinkPad T420 and T420i you are servicing might have the SIM card that the customer has installed. If the computer you are servicing has the SIM card, remove it before you start the servicing.

  • Page 71: 1010 Battery Pack

    1010 Battery pack Important notice for replacing a battery pack: Lenovo ThinkVantage Toolbox (in Windows 7) has an automatic battery diagnostic that determines if the battery pack is defective. A battery pack FRU should not be replaced unless this diagnostic shows that the battery is defective.

  • Page 72: 1020 Expresscard Blank Bezel

    Table 10. Removal steps of ExpressCard blank bezel When you press the ExpressCard blank bezel , it pops out When installing: Make sure that the bezel is correctly oriented as shown in the following igure. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 73: 1030 Serial Ultrabay Enhanced Device Or Travel Bezel

    1030 Serial Ultrabay Enhanced device or travel bezel For access, remove this FRU: • “1010 Battery pack” on page 65 Table 11. Removal steps of Serial Ultrabay Enhanced device or travel bezel Holding the bay lock latch in the unlocked position , slide the bay eject latch in the direction shown by arrow , and then pull out the Serial Ultrabay Enhanced device or the travel bezel in the direction shown by arrow to completely remove it...

  • Page 74: 1040 Hard Disk Drive (Hdd) And Solid State Drive

    Table 12. Removal steps of hard disk drive and solid state drive Note: Loosen the screw , but do not remove it. Step Screw (quantity) Color Torque Black 0.181 Nm Capture screw (1) (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 75 Table 12. Removal steps of hard disk drive and solid state drive (continued) For HDD and HDD rubber rails (9.5mm): For HDD and HDD rubber rails (7.0mm) : Chapter 8 Removing and replacing a FRU...
  • Page 76 Table 12. Removal steps of hard disk drive and solid state drive (continued) For SSD and spacers: When installing: Make sure that SSD spacers or HDD rubber rails are attached irmly. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 77: 1050 Dimm Slot Cover

    1050 DIMM slot cover For access, remove this FRU: • “1010 Battery pack” on page 65 Table 13. Removal steps of DIMM slot cover Note: Loosen the screw , but do not remove it. Chapter 8 Removing and replacing a FRU...

  • Page 78: 1060 Dimm

    When installing: Insert the notched end of the DIMM into the socket. Press the DIMM irmly, and pivot it until it snaps into place. Make sure that it is irmly ixed in the slot and does not move easily. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 79: 1070 Pci Express Mini Card For Wireless Wan

    1070 PCI Express Mini Card for wireless WAN For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1050 DIMM slot cover” on page 71 Table 15. Removal steps of PCI Express Mini Card for wireless WAN In step , unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159), or pick the connectors with your ingers and gently unplug them in the direction of the arrow.
  • Page 80 If the computer you are servicing is a wireless WAN-ready model and does not have a wireless WAN card, route the antenna cables and secure them with a tape as shown in the following igure. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 81: 1080 Keyboard

    1080 Keyboard For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1050 DIMM slot cover” on page 71 Table 16. Removal steps of keyboard Step Screw (quantity) Color Torque M2 × 10 mm, wafer-head, nylon-coated (1) Silver 0.181 Nm (1.85 kgfcm)
  • Page 82 Table 16. Removal steps of keyboard (continued) Lift the keyboard a little in the direction shown by arrow , and then detach the connector ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 83 When installing the keyboard, do as follows: Table 17. Installation steps of keyboard 1. Attach the keyboard connector. 2. Attach the keyboard so that the keyboard edges are under the frame as shown in the following igure. Chapter 8 Removing and replacing a FRU...
  • Page 84 3. To make sure that the front edge of the keyboard is housed irmly, gently press the keys with your palms and slightly slide the keyboard toward you until it snaps into position. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 85 Table 17. Installation steps of keyboard (continued) 4. Make sure that the front edge of the keyboard is attached irmly. 5. Secure the keyboard by tightening the screws from the bottom side of the computer. Chapter 8 Removing and replacing a FRU...

  • Page 86: 1090 Dimm (In The Slot Under The Keyboard)

    If you install a DIMM in only one of the two slots, install it in the slot located under the keyboard. Table 18. Removal steps of DIMM (in the slot under the keyboard) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 87 Table 18. Removal steps of DIMM (in the slot under the keyboard) (continued) When installing: Insert the notched end of the DIMM into the socket. Press the DIMM irmly, and pivot it until it snaps into place. Make sure that it is irmly ixed in the slot and does not move easily. Chapter 8 Removing and replacing a FRU...

  • Page 88: 1100 Backup Battery

    • “1080 Keyboard” on page 75 Table 19. Removal steps of backup battery DANGER Use only the battery speciied in the parts list for your computer. Any other battery could ignite or explode. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 89 Table 19. Removal steps of backup battery (continued) Cable routing: Attach the backup battery and route the cable as shown in the igure below and make sure that the battery connector is attached irmly. Chapter 8 Removing and replacing a FRU...

  • Page 90: 1110 Pci Express Mini Card For Wireless Lan

    Note: Some models might have only two antenna cables. Step Screw (quantity) Color Torque M2 × 10 mm, wafer-head, nylon-coated (1) Silver 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 91 Table 20. Removal steps of PCI Express Mini Card for wireless LAN (continued) When installing: • In models with a wireless LAN card that has two antenna connectors, plug the gray cable into the jack marked MAIN or M, and the black cable into the jack marked AUX or A on the card. If the computer you are servicing has three cables, put the white cable in the cable protection tube and secure it with a tape as shown in this igure.

  • Page 92: 1120 Keyboard Bezel Assembly, Fpc Cable, And Bluethooth Daughter Card (Bdc-2.1)

    Table 21. Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card Step Screw (quantity) Color Torque M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) M2 × 15 mm, wafer-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 93 Table 21. Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card (continued) Torque Step Screw (quantity) Color M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Black 0.181 Nm Shoulder screw (2) (1.85 kgfcm) Chapter 8 Removing and replacing a FRU...
  • Page 94 Table 21. Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card (continued) When installing: Make sure that the connector is attached irmly. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 95 Table 21. Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card (continued) When installing: Make sure that the connectors are attached irmly. Step Screw (quantity) Color Torque M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Chapter 8 Removing and replacing a FRU...
  • Page 96 Table 21. Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card (continued) When installing: Make sure that the connector is attached irmly. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 97: 1130 Smartcard Or Contactless Smartcard

    1130 SmartCard or Contactless SmartCard For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1050 DIMM slot cover” on page 71 • “1080 Keyboard” on page 75 • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card (BDC-2.1)” on page 86 Table 22.
  • Page 98 Some models have a SmartCard dummy spacer as a miscellaneous part. For those models, remove the spacer as shown: Step Screw (quantity) Color Torque M2 × 3 mm, wafer-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 99: 1140 Modem Daughter Card (Mdc)

    1140 Modem daughter card (MDC) For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1050 DIMM slot cover” on page 71 • “1080 Keyboard” on page 75 • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card (BDC-2.1)” on page 86 Table 24.

  • Page 100: 1150 Speaker Assembly

    • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card (BDC-2.1)” on page 86 Table 25. Removal steps of speaker assembly Step Screw (quantity) Color Torque M2 × 3 mm, wafer-head, nylon-coated (3) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 101 Table 25. Removal steps of speaker assembly (continued) When installing: Attach the speaker assembly and route the cable as shown in the following igure, and make sure that the speaker connector is attached irmly. Chapter 8 Removing and replacing a FRU...

  • Page 102: 1160 Lcd Unit

    • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card (BDC-2.1)” on page 86 Table 26. Removal steps of LCD unit Step Screw (quantity) Color Torque M2.5 × 6 mm, wafer-head, nylon-coated (2) Black 0.392 Nm (4.0 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 103 Table 26. Removal steps of LCD unit (continued) Torque Step Screw (quantity) Color M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) Chapter 8 Removing and replacing a FRU...
  • Page 104 Table 26. Removal steps of LCD unit (continued) Torque Step Screw (quantity) Color M2.5 × 6 mm, wafer-head, nylon-coated (2) Black 0.392 Nm (4.0 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 105 Table 26. Removal steps of LCD unit (continued) When installing: • Make sure that you attach the connectors irmly. • Make sure that you route the cables correctly and you tape up in the proper positions as shown in the above igure. •...
  • Page 106 Table 26. Removal steps of LCD unit (continued) ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 107: 1170 Fan Assembly

    1170 Fan assembly For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1020 ExpressCard blank bezel” on page 66 • “1050 DIMM slot cover” on page 71 • “1070 PCI Express Mini Card for wireless WAN” on page 73 •...
  • Page 108 Table 27. Removal steps of fan assembly (continued) For Integreted Graphics models: Step Screw (quantity) Color Torque Capture shoulder screw (4) Silver 0.181 Nm (1.85 kgfcm) black 0.181 Nm M2 × 3 mm, wafer-head, nylon-coated (1) (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 109 Table 27. Removal steps of fan assembly (continued) For Discrete Graphics models: For Integreted Graphics models: Chapter 8 Removing and replacing a FRU...
  • Page 110 For the fan in the integrated graphics models, you need to peel the thin ilm off from the thermal rubber marked For Discrete Graphics models: For Integrated Graphics models: ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 111 Table 27. Removal steps of fan assembly (continued) • When attaching the fan assembly to the frame, take care not to damage the heat sink of the fan assembly. • Make sure that the fan connector is attached irmly. Chapter 8 Removing and replacing a FRU...

  • Page 112: 1180 Cpu

    When installing: Make sure that the mylar is attached to the CPU. Place the CPU on the CPU socket, and then rotate the head of the screw in the direction shown by arrow to secure the CPU. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 113: Cable

    1190 Base cover assembly and DC-in connector cable For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1020 ExpressCard blank bezel” on page 66 • “1030 Serial Ultrabay Enhanced device or travel bezel” on page 67 •...
  • Page 114 M2 × 5 mm, wafer-head, nylon-coated (8) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connector is attached irmly. When installing: Make sure that the wireless switch is adjusted as shown in callout ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 115 Table 29. Removal steps of base cover assembly and DC-in connector cable (continued) Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, wafer-head, nylon-coated (1) (1.85 kgfcm) Chapter 8 Removing and replacing a FRU...
  • Page 116 China wireless WAN label China modem label For some models, you need to apply two FCC labels. Check the old base cover; if it has two FCC labels, apply both to the new base cover. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 117 For the location of each label, refer the following igure: Chapter 8 Removing and replacing a FRU...

  • Page 118: 1200 Magnesium Structure Frame

    Table 30. Removal steps of magnesium structure frame Step Screw (quantity) Color Torque M2 × 5 mm, wafer-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) M2 × 8 mm, wafer-head, nylon-coated (2) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 119 Table 30. Removal steps of magnesium structure frame (continued) 0.392 Nm Hex stud, nylon-coated (2) Silver (4.0 kgfcm) Chapter 8 Removing and replacing a FRU...

  • Page 120: Assembly

    The procedure is as follows: 1. Place the computer on a horizontal surface. 2. Run Diagnostics ➙ ThinkPad Devices ➙ HDD Active Protection Test. Attention: Do not apply physical shock to the computer while the test is running. Table 31. Removal steps of system board and ExpressCard slot assembly The following components soldered on the top side of the system board are extremely sensitive.
  • Page 121 Table 31. Removal steps of system board and ExpressCard slot assembly (continued) Accelerometer chip for the HDD Active Protection System Platform Controller Hub (PCH) Graphic Processing Unit (GPU) (Discrete graphics chip) Note: The GPU is only for models with switchable graphics. Models with integrated graphics do not have a GPU on the system board.
  • Page 122 Table 31. Removal steps of system board and ExpressCard slot assembly (continued) Torque Step Screw (quantity) Color M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) When installing: Make sure that the connector is attached irmly. ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 123: 2010 Lcd Bezel Assembly

    2010 LCD bezel assembly For access, remove the following FRU: • “1010 Battery pack” on page 65 Table 32. Removal steps of LCD bezel assembly Chapter 8 Removing and replacing a FRU...

  • Page 124: 2020 Led Board

    “1010 Battery pack” on page 65 • “2010 LCD bezel assembly” on page 117 Table 33. Removal steps of LED board Step Screw (quantity) Color Torque 0.181 Nm M2 × 3 mm, lat-head, nylon-coated (1) Silver (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 125 Table 33. Removal steps of LED board (continued) When installing: Make sure that the connector is attached irmly. Chapter 8 Removing and replacing a FRU...

  • Page 126: 2030 Integrated Camera

    “1010 Battery pack” on page 65 • “2010 LCD bezel assembly” on page 117 Table 34. Removal steps of integrated camera Torque Step Screw (quantity) Color M2 × 3 mm, lat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 127 Table 34. Removal steps of integrated camera (continued) Chapter 8 Removing and replacing a FRU...

  • Page 128: 2040 Lcd Panel And Lcd Cable

    “2030 Integrated camera” on page 120 Table 35. Removal steps of LCD panel and LCD cable Step Screw (quantity) Color Torque M2 × 3 mm, wafer-head, nylon-coated (4) Black 0.181 Nm (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 129 Table 35. Removal steps of LCD panel and LCD cable (continued) When installing: When attaching the LCD panel to the cover, gently press the left and right edges covered with metal. DO not press the surface of the panel or apply any excessive force to the panel. When installing: Make sure that the connector is attached irmly.

  • Page 130: 2050 Camera Cable

    “2010 LCD bezel assembly” on page 117 • “2020 LED board” on page 118 • “2030 Integrated camera” on page 120 • “2040 LCD panel and LCD cable” on page 122 Table 36. Removal steps of camera cable ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 131: 2060 Wireless Lan Antenna Assembly Or Wireless Lan/Wan Antenna Assembly

    2060 Wireless LAN antenna assembly or wireless LAN/WAN antenna assembly For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1020 ExpressCard blank bezel” on page 66 • “1050 DIMM slot cover” on page 71 •...
  • Page 132 Table 37. Removal steps of wireless LAN antenna assembly or wireless LAN/WAN antenna assembly (continued) Step Screw (quantity) Color Torque Black 0.181 Nm M2 × 3 mm, lat-head, nylon-coated (2) (1.85 kgfcm) ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 133: 2070 Hinges And Lcd Rear Cover Assembly

    2070 Hinges and LCD rear cover assembly For access, remove these FRUs in order: • “1010 Battery pack” on page 65 • “1020 ExpressCard blank bezel” on page 66 • “1050 DIMM slot cover” on page 71 • “1070 PCI Express Mini Card for wireless WAN” on page 73 •...
  • Page 134 Table 38. Removal steps of hinges and LCD rear cover assembly (continued) ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 135: Chapter 9. Locations

    Chapter 9. Locations This chapter presents the locations of ThinkPad T420 and T420i hardware components. Front view Integrated camera (for some models) ThinkLight Built-in microphone Built-in speakers Security keyhole Universal serial bus (USB)/eSATA combo connector USB connector Media Card Reader slot...
  • Page 136 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 137: Rear View

    Rear view Status indicators Note: For the description of each indicator, see Chapter 5 “Status indicators” on page 51. SmartCard slot DisplayPort connector USB connector RJ-45 (Ethernet) connector External monitor connector Power jack USB connector Modem connector or IEEE 1394 Chapter 9 Locations...

  • Page 138: Bottom View

    Bottom view Battery pack Battery pack latch DIMM slot Docking connector LCD cover latch Serial Ultrabay Enhanced lock latch Serial Ultrabay Enhanced eject latch ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 139: Chapter 10. Parts List

    An N in the CRU ID column means that the part is not a CRU. A single asterisk (*) means that the part is a Self-service CRU; two asterisks (**) means that the part is an Optional-service CRU. ThinkPad Notebooks contain...

  • Page 140: Overall

    Overall ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 141 Table 39. Parts list—Overall No. FRU (Overall) FRU no. CRU ID See “Miscellaneous parts” on page 167. LCD unit (see “LCD FRUs” on page 154.) Keyboard bezel assembly without ingerprint reader 04W1372 • 4177-CTO, 25x, 26x, 28x, Q5x, QDx, QFx •...
  • Page 142 DVD-ROM drive 75Y5117 • 4177–CTO • 4178–CTO • 4179–CTO • 4180–CTO • 4236–CTO Travel cover 60Y5512 • 4177–CTO, Q7x, QDx, QFx • 4178–CTO • 4179–CTO • 4180–CTO, LPx, LQx • 4236–CTO, NDx, NEx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 143 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 1-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card 55Y3715 • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...
  • Page 144 • 4179–CTO • 4180–CTO • 4236–CTO 42T4885 Battery pack, Li-ion (4-cell) 55 • 4177–CTO, 2Dx, QDx, QEx • 4178–CTO, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx • 4179–CTO • 4180–CTO • 4236–CTO ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 145 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID Battery pack, Li-ion (6-cell) 55+ 42T4791 • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q5x, Q8x, QAx, QCx •...
  • Page 146 • 4180–CTO, 65x, KZx, MAx, MFx • 4236–CTO, 65x Battery pack, Li-ion (9-cell) 55++ 42T4912 • 4177–CTO, Q3x, Q4x, Q7x, QBx, QFx • 4178–CTO, 58x • 4179–CTO • 4180–CTO, 65x, KZx, MAx, MFx • 4236–CTO, 65x ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 147 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID Base cover assembly 04W1626 • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...
  • Page 148 • 4177–CTO, 22x, 25x, 28x, 2Dx, 2Ex, QDx • 4178–CTO, 5Ax, 5Bx, 5Cx, 5Dx, 9Vx • 4179–CTO, G2x, G4x, G5x, G6x, G7x, G8x, G9x • 4180–CTO, KWx, LEx, LNx, LUx, M7x, MAx • 4236–CTO, N2x, N6x, NCx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 149 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 12 SATA hard disk drive, 320 GB, 5,400 rpm 45N7297 • 4177–CTO, 22x, 25x, 28x, 2Dx, 2Ex, QDx • 4178–CTO, 5Ax, 5Bx, 5Cx, 5Dx, 9Vx • 4179–CTO, G2x, G4x, G5x, G6x, G7x, G8x, G9x •...
  • Page 150 • 4180–CTO, 62x, 63x, 64x, K2x, K6x, K7x, K8x, K9x, KCx, KEx, KFx, KHx, KJx, KLx, KMx, KPx, KRx, KSx, KTx, KUx, KYx, L2x, L9x, LAx, LCx, LDx, LVx, LWx, M9x, MBx, MCx, MGx, MJx • 4236–CTO, 62x, 63x, 64x, N3x, N4x, NHx, NKx, NLx, NNx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 151 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 12 SATA hard disk drive, 320 GB, 7200 rpm 42T1171 • 4177–CTO, 23x, 29x, 2Ax, 2Fx, Q2x, Q4x, Q5x • 4178–CTO, 52x, 53x, 54x, 56x, 58x, 59x, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 9Ex, 9Px, 9Qx, 9Rx, 9Ux, 9Wx, 9Xx, 9Yx •...
  • Page 152 • 4236–CTO, N6x, N7x, N8x, NCx, NKx, NLx 14 System board assembly, integrated graphics, non-AMT, non-TPM, non-AES 04W1468 • 4177–CTO, 2Fx, 2Gx • 4178–CTO, 9Vx, 9Wx, 9Yx • 4179–CTO • 4180–CTO • 4236–CTO ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 153 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 14 System board assembly, discrete graphics, AMT, TPM, AES 04W1347 • 4177–CTO, 2Jx, 2Nx, 2Px, Q3x, Q4x, QBx, QFx • 4178–CTO, 54x, 55x, 58x, 5Ex, 5Fx, 5Yx, 5Zx, 99x, 9Ax •...
  • Page 154 LMx, LQx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x, M7x, M8x, M9x, MBx, MCx, MDx, MEx, MFx, MGx, MHx, MJx • 4236–CTO, 62x, 63x, 64x, 65x, N2x, N3x, N5x, NAx, NBx, NDx, NEx, NHx, NMx, NNx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 155 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 16 Intel Centrino Ultimate-N 6300 60Y3233 • 4177–CTO, 2Hx, 2Jx, Q8x, QFx • 4178–CTO, 99x, 9Ax, 9Bx, 9Cx • 4179–CTO • 4180–CTO, KGx, KXx, KYx, KZx, L2x, L3x, M5x, M6x •...
  • Page 156 LPx, LRx, LSx, LTx, LUx, LWx, M2x, M7x, M8x, M9x, MBx, MCx, MDx, MEx, MJx • 4236–CTO, 62x, 63x, N2x, N3x, N5x, N6x, N7x, N8x, NCx, NGx, NHx, NKx, NLx, NMx, NNx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 157 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 21 Fan assembly, integrated 04W0409 • 4177–CTO, 25x, 26x, 27x, 28x, 29x, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, Q2x, Q5x, Q7x, Q8x, QAx, QCx, QDx, QFx • 4178–CTO, 52x, 53x, 56x, 57x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Rx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 92x, 93x, 95x, 96x, 97x, 98x, 9Bx, 9Cx, 9Fx, 9Gx, 9Px, 9Qx, 9Rx, 9Vx, 9Wx, 9Yx •...
  • Page 158 • 4236–CTO, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, MBx 27 DIMM slot door 04W1636 28 HDD cover 04W1637 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 159 Table 39. Parts list—Overall (continued) No. FRU (Overall) FRU no. CRU ID 29 Audio sub card 04W1623 • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...

  • Page 160: Lcd Frus

    — ac power adapter (see “Information about ac power adapters” on page 170.) LCD FRUs In ThinkPad T420 and T420i, there are following types of LCDs. • 14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display (Table 40 “Parts list—14.0-inch HD (1366 x 768) LED Backlight Anti-Glare Display”...
  • Page 161 Table 40. Parts list—14.0-inch HD (1366 x 768) LED Backlight Anti-Glare Display No. FRU (14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display) FRU no. See “Miscellaneous parts” on page 167. Chapter 10 Parts list...
  • Page 162 LMx, LNx, LPx, LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, M2x, M3x, M4x, M5x, M6x, M7x, M9x, MAx, MCx, MGx • 4236–CTO, 62x, 64x, N2x, N3x, N5x, NCx, NDx, NKx, NLx, NMx, NPx, NQx, NRx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 163 Table 40. Parts list—14.0-inch HD (1366 x 768) LED Backlight Anti-Glare Display (continued) No. FRU (14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display) FRU no. 93P5687 LCD module, 14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Mx, Q4x, Q5x, Q7x, QCx, QDx, QEx •...
  • Page 164 MFx, MGx, MHx, MJx • 4236–CTO, 62x, 63x, 64x, 65x, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 165 Table 40. Parts list—14.0-inch HD (1366 x 768) LED Backlight Anti-Glare Display (continued) No. FRU (14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display) FRU no. 04W1615 N Wireless antenna (wireless LAN/wirless WAN) • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...
  • Page 166 MFx, MGx, MHx, MJx • 4236–CTO, 62x, 63x, 64x, 65x, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 167 Table 40. Parts list—14.0-inch HD (1366 x 768) LED Backlight Anti-Glare Display (continued) No. FRU (14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display) FRU no. 04W1620 N Clear plate kit • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...
  • Page 168 MFx, MGx, MHx, MJx • 4236–CTO, 62x, 63x, 64x, 65x, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 169 Table 41. Parts list—14.0-inch HD+ (1600 x 900) LED backlight Anti-Glare Display (continued) No. FRU (14.0-inch HD+ (1600 x 900) LED backlight Anti-Glare Display) FRU no. Hinges 04W1612 N • 4177–CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, Q2x, Q3x, Q4x, Q5x, Q7x, Q8x, QAx, QBx, QCx, QDx •...
  • Page 170 MFx, MGx, MHx, MJx • 4236–CTO, 62x, 63x, 64x, 65x, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, MBx ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 171 Table 41. Parts list—14.0-inch HD+ (1600 x 900) LED backlight Anti-Glare Display (continued) No. FRU (14.0-inch HD+ (1600 x 900) LED backlight Anti-Glare Display) FRU no. 04W1618 N LCD cable • 4177–CTO, 2Kx, 2Lx, 2Nx, 2Px, Q2x, Q3x, Q8x, QAx, QBx •...

  • Page 172: Keyboard

    45N2099 45N2169 45N2239 U.K. English 45N2100 45N2170 45N2240 45N2071 45N2141 45N2211 U.S. English U.S. English (International, with a Euro symbol) 45N2101 45N2171 45N2241 Netherlands 45N2090 45N2160 45N2230 Turkish (F Type) 60Y9552 60Y9554 60Y9550 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 173: Miscellaneous Parts

    Miscellaneous parts Table 43. Parts list—Miscellaneous parts FRU no. Screw kit: 04W1605 • M2 × 3 mm, black (50) • M2 × 5 mm, black (20) • M2 × 8 mm, black (15) • M2 × 10 mm, Silver (4) •...
  • Page 174 • Sponge for RJ45 connector • Sponge for display port connector • Sponge for HDD 1 • Sponge for HDD 2 • Sponge for HDD 3 • Sponge for ODD 1 • Sponge for ODD 2 ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 175 • LED lens - LCD front bezel • Shield - EMC • Clear plate - LCD rear cover • LED lens - LCD rear cover • ThinkPad logo • Lenovo logo • LCD latch - right • LCD latch - left •...

  • Page 176: Information About Ac Power Adapters

    3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV) 42T4433 3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV) 45N0068 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 177: Power Cords

    Power cords A ThinkPad power cord for a speciic country or region is usually available only in that country or region: Table 46. Parts list—2-pin power cords Country or region FRU no. Argentina 42T5020 42T5105 • models -CTO, xxY Brazil...

  • Page 178: Recovery Discs

    Recovery discs ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 179: Windows 7 Professional (32 Bit) Dvds

    Windows 7 Professional (32 bit) DVDs Windows 7 Professional (32 bit) is preinstalled as the operating system in the following models: • 4177-CTO, QAx, Q7x, QDx • 4178-CTO, 9Qx, 9Px, 9Vx, 9Ux • 4179-CTO, G7x, G3x • 4180-CTO, MFx, LTx, LQx, LPx, LMx, LKx, LHx, LGx, LDx, LCx, L7x, KQx, KLx, K7x, K6x, K3x, LSx, LRx •...

  • Page 180: Windows 7 Professional (64 Bit) Dvds

    03W7922 Spanish 03W7923 Serbian-Cyrllic 03W7924 Turkish 03W7925 US English (Disabled) 03W7926 US English 03W7927 English, Danish, Finnish, Swedish, and Norwegian 03W7928 English, Dutch, French, German, and Italian 03W7929 English, Slovenian, and Croatian 03W7930 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 181: Windows 7 Home Basic (32 Bit) Dvds

    Windows 7 Home Basic (32 bit) DVDs Windows 7 Home Basic (32 bit) is preinstalled as the operating system in the following models: • 4177-CTO, 2Ex, 24x, 23x, 22x • 4178-CTO, 9Ex, 9Dx • 4179-CTO, G9x, G8x • 4180-CTO, MGx, MAx •...

  • Page 182: Windows 7 Home Premium (32 Bit) Dvds

    • 4178-CTO • 4179-CTO, G4x • 4180-CTO, LNx • 4236-CTO, NCx Table 51. Parts list—Windows 7 Home Premium (64 bit) recovery DVDs Language Simpliied Chinese 03W7946 03W7947 English (for India) US English 03W7948 ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 183: Windows 7 Home Premium (64 Bit) Dvds

    Windows 7 Home Premium (64 bit) DVDs Windows 7 Home Premium (64 bit) is preinstalled as the operating system in the following models: • 4177-CTO, 2Mx, 2Lx, 2Jx, QFx • 4178-CTO, 9Nx, 9Fx • 4179-CTO • 4180-CTO • 4236-CTO, NRx, NQx, NPx Table 52.

  • Page 184: Common Service Tools

    USB loppy diskette drive tool kit 27L3452 Test card for integrated Smart Card 42W7820 — LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later Note: Download the ile from the following Web site: http://www.lenovo.com/spm ThinkPad T420 and T420i Hardware Maintenance Manual...

  • Page 185: Appendix A. Notices

    Appendix A. Notices Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used.

  • Page 186: Trademarks

    The following terms are trademarks of Intel Corporation or its subsidiaries in the United States, other countries, or both: Intel Intel Centrino Intel Core Other company, product, or service names may be the trademarks or service marks of others. ThinkPad T420 and T420i Hardware Maintenance Manual...
  • Page 188 Part Number: 0A60007 Printed in China (1P) P/N: 0A60007 *0A60007*...

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