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Open and replacement of diverse parts.

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  • Hardware Maintenance Manual

    ThinkPad T420s and T420si

  • Note

    Before using this information and the product it supports, be sure to read the general information underAppendix A Notices on page 143.

    Eighth Edition (November 2013)

    Copyright Lenovo 2011, 2013.LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General ServicesAdministration GSA contract, use, reproduction, or disclosure is subject to restrictions set forth in ContractNo. GS-35F-05925.

  • Contents

    About this manual. . . . . . . . . . . iii

    Chapter 1. Safety information. . . . . . 1General safety . . . . . . . . . . . . . . . . 1Electrical safety . . . . . . . . . . . . . . . 2Safety inspection guide . . . . . . . . . . . . 3Handling devices that are sensitive to electrostaticdischarge. . . . . . . . . . . . . . . . . . 3Grounding requirements . . . . . . . . . . . . 4Safety notices (multilingual translations) . . . . . . 4Laser compliance statement (multilingualtranslations) . . . . . . . . . . . . . . . . 24

    Chapter 2. Important serviceinformation . . . . . . . . . . . . . . 31Strategy for replacing FRUs . . . . . . . . . 31

    Strategy for replacing a hard disk drive . . . 32Important notice for replacing a systemboard . . . . . . . . . . . . . . . . 32How to use error message . . . . . . . . 32

    Strategy for replacing FRUs for CTO, CMV, andGAV . . . . . . . . . . . . . . . . . . . 32

    Product definition. . . . . . . . . . . . 32FRU identification for CTO, CMV, and GAVproducts . . . . . . . . . . . . . . . 33

    Chapter 3. General checkout . . . . . 35What to do first . . . . . . . . . . . . . . 35Checkout guide . . . . . . . . . . . . . . 36

    System supporting the Lenovo ThinkVantageToolbox program and the PC-Doctor for DOSdiagnostics program . . . . . . . . . . 36System supporting the Lenovo diagnosticsprograms . . . . . . . . . . . . . . . 40

    Power system checkout . . . . . . . . . . . 42Checking the ac power adapter . . . . . . 43Checking operational charging . . . . . . 44Checking the battery pack . . . . . . . . 44Checking the backup battery . . . . . . . 44

    Chapter 4. Related serviceinformation . . . . . . . . . . . . . . 47Restoring the factory contents by using ProductRecovery discs . . . . . . . . . . . . . . 47Restoring the factory contents by using RecoveryDisc Set . . . . . . . . . . . . . . . . . 47Passwords . . . . . . . . . . . . . . . . 49

    Power-on password . . . . . . . . . . . 49Hard disk password . . . . . . . . . . . 49

    Supervisor password . . . . . . . . . . 49How to remove the power-on password . . . 49How to remove the hard disk password . . . 50

    Power management . . . . . . . . . . . . 50Screen blank mode . . . . . . . . . . . 50Sleep (standby) mode . . . . . . . . . . 51Hibernation mode . . . . . . . . . . . 51

    Symptom-to-FRU index . . . . . . . . . . . 52Numeric error codes . . . . . . . . . . 53Error messages . . . . . . . . . . . . 54Beep symptoms . . . . . . . . . . . . 54No-beep symptoms . . . . . . . . . . . 55LCD-related symptoms . . . . . . . . . 55Intermittent problems . . . . . . . . . . 56Undetermined problems . . . . . . . . . 56

    Chapter 5. Status indicators . . . . . 57

    Chapter 6. Fn key combinations . . . 61

    Chapter 7. FRU replacementnotices . . . . . . . . . . . . . . . . 63Screw notices . . . . . . . . . . . . . . . 63Retaining serial numbers. . . . . . . . . . . 64

    Restoring the serial number of the systemunit . . . . . . . . . . . . . . . . . 64Retaining the UUID . . . . . . . . . . . 65Reading or writing the ECA information . . . 65

    Chapter 8. Removing and replacing aFRU . . . . . . . . . . . . . . . . . . 67Before servicing ThinkPad T420s and T420simodels. . . . . . . . . . . . . . . . . . 671010 Battery pack . . . . . . . . . . . . . 681020 Serial Ultrabay Slim device or travel bezel . . 691030 Solid-state drive (SSD) or hard disk drive(HDD) . . . . . . . . . . . . . . . . . . 701040 DIMM . . . . . . . . . . . . . . . . 721050 PCI Express Mini Card for wireless LAN . . 741060 PCI Express Mini Card for wireless WAN . . 771070 4in1 media card reader . . . . . . . . 791080 Keyboard . . . . . . . . . . . . . . 801090 Backup battery . . . . . . . . . . . . 831100 Palm rest with fingerprint reader, smart cardreader, and speaker. . . . . . . . . . . . . 841110 LCD unit . . . . . . . . . . . . . . . 881120 DC-in sub card . . . . . . . . . . . . 901130 Bluetooth daughter card (BDC-3.0) . . . . 91

    Copyright Lenovo 2011, 2013 i

  • 1140 Bluetooth-wireless radio switch FPC . . . . 911150 System board, fan assembly, 34-mmExpressCard reader, and base cover . . . . . . 931160 mSATA . . . . . . . . . . . . . . . 992010 LCD bezel assembly . . . . . . . . . . 1012020 LCD panel . . . . . . . . . . . . . . 1022030 Integrated camera, microphone, or hallsensor card . . . . . . . . . . . . . . . . 1042040 LED sub card . . . . . . . . . . . . . 1062050 LCD cable . . . . . . . . . . . . . . 1072060 Hinge kit . . . . . . . . . . . . . . . 1082070 LED cable . . . . . . . . . . . . . . 1102080 Antenna kit and LCD rear cover assembly . . 111

    Chapter 9. Locations . . . . . . . . 115Front view . . . . . . . . . . . . . . . . 115Rear view. . . . . . . . . . . . . . . . . 116Bottom view . . . . . . . . . . . . . . . 116

    Chapter 10. Parts list . . . . . . . . 117Overall . . . . . . . . . . . . . . . . . . 118LCD FRUs . . . . . . . . . . . . . . . . 128Keyboard . . . . . . . . . . . . . . . . . 132

    Miscellaneous parts . . . . . . . . . . . . 133ac power adapter . . . . . . . . . . . . . 134Power cords . . . . . . . . . . . . . . . 134Recovery discs . . . . . . . . . . . . . . 135

    Windows XP Professional (32 bit) DVDs . . . 135Windows Vista Home Basic (32 bit) DVDs . . 136Windows Vista Business (32 bit) DVDs . . . 136Windows 7 Home Basic (32 bit) DVDs. . . . 137Windows 7 Home Basic (64 bit) DVDs. . . . 137Windows 7 Ultimate (32 bit) DVDs . . . . . 138Windows 7 Ultimate (64 bit) DVDs . . . . . 138Windows 7 Home Premium (32 bit) DVDs . . 138Windows 7 Home Premium (64 bit) DVDs . . 139Windows 7 Professional (32 bit) DVDs. . . . 139Windows 7 Professional (64 bit) DVDs. . . . 140Windows 7 Professional (32 bit) Rapid BootDVDs . . . . . . . . . . . . . . . . 141

    Common service tools . . . . . . . . . . . 142

    Appendix A. Notices. . . . . . . . . 143Electronic emissions notices . . . . . . . . . 144Trademarks . . . . . . . . . . . . . . . . 144

    ii Hardware Maintenance Manual

  • About this manual

    This manual contains service and reference information for the following ThinkPad products.

    ThinkPad T420s and T420si Machine types (MT) 4170, 4171, 4172, 4173, 4174, 4175, and 4176

    Use this manual along with the advanced diagnostic tests to troubleshoot problems.

    Important: This manual is intended only for trained service technicians who are familiar with ThinkPadproducts. Use this manual along with the advanced diagnostic tests to troubleshoot problemseffectively.Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 Safetyinformation on page 1 and Chapter 2 Important service information on page 31.

    Copyright Lenovo 2011, 2013 iii

  • iv Hardware Maintenance Manual

  • Chapter 1. Safety information

    This chapter presents following safety information that you need to be familiar with before you servicea ThinkPad Notebook.

    General safety on page 1

    Electrical safety on page 2

    Safety inspection guide on page 3

    Handling devices that are sensitive to electrostatic discharge on page 3

    Grounding requirements on page 4

    Safety notices (multilingual translations) on page 4

    Laser compliance statement (multilingual translations) on page 24

    General safetyFollow these rules to ensure general safety:

    Observe good housekeeping in the area of the machines during and after maintenance.

    When lifting any heavy object:

    1. Make sure that you can stand safely without slipping.

    2. Distribute the weight of the object equally between your feet.

    3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.

    4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from themuscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or thatyou think is too heavy for you.

    Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.

    Before you start the machine, make sure that other service technicians and the customer's personnel arenot in a hazardous position.

    Place removed covers and other parts in a safe place, away from all personnel, while you are servicingthe machine.

    Keep your toolcase away from walk areas so that other people will not trip over it.

    Do not wear loose clothing that can be trapped in the moving parts of a machine. Make sure that yoursleeves are fastened or rolled up above your elbows. If your hair is long, fasten it.

    Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8centimeters (3 inches) from the end.

    Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.

    Attention: Metal objects are good electrical conductors.

    Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, usingsolvents, or working in any other conditions that might be hazardous to your eyes.

    After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety devicethat is worn or defective.

    Reinstall all covers correctly before returning the machine to the customer.

    Fan louvers on the machin