Lenovo ThinkPad L420 Hardware Maintenance Manual

Lenovo

Laptop

🧩  Manuals supported for 2 models of Lenovo

  • ThinkPad L421
  • ThinkPad L520

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Table of Contents
  • About this manual

    5
  • Chapter 1. Safety information

    7
  • Electrical safety

    8
  • Safety inspection guide

    9
  • Grounding requirements

    10
  • Chapter 2. Important service information

    31
  • Strategy for replacing a hard disk drive

    32
  • Products

    33
  • Chapter 3. General checkout

    35
  • Checkout guide

    36
  • Testing the computer

    37
  • Lenovo ThinkVantage Toolbox

    39
  • Power system checkout

    40
  • Checking operational charging

    41
  • Checking the backup battery

    42
  • Chapter 4. Related service information

    43
  • Passwords

    44
  • Supervisor password

    45
  • Power management

    46
  • Hibernation mode

    47
  • Numeric error codes

    48
  • Error messages

    50
  • Undetermined problems

    51
  • Chapter 5. Status indicators

    53
  • Chapter 6. Fn key combinations

    55
  • Chapter 7. FRU replacement notices

    59
  • Retaining serial numbers

    60
  • Reading or writing the ECA information

    61
  • Battery pack

    63
  • ExpressCard blank bezel and Media Card blank bezel

    64
  • Optical drive or travel cover

    66
  • Thermal cover

    67
  • Hard disk drive or solid state drive assembly

    68
  • DIMM

    70
  • Fan assembly

    71
  • SIM slot cover

    75
  • Mini Card for wireless WAN

    76
  • MSATA solid state drive

    77
  • Palm rest assembly with cables

    79
  • PCI Express Mini Card for wireless LAN

    82
  • Backup battery

    84
  • Media Card Reader slot board and Media Card Reader cable assembly

    85
  • Keyboard

    87
  • Keyboard bezel

    89
  • LCD unit

    91
  • Top shielding assembly

    94
  • System board assembly

    96
  • USB connector board and USB cable assembly

    101
  • DC-in cable and base cover

    103
  • LCD front bezel

    106
  • Speaker assembly

    107
  • Integrated camera

    108
  • Antenna assembly

    109
  • Cover assembly

    111
  • Chapter 9. Locations

    115
  • Rear view

    116
  • Chapter 10. Parts list

    117
  • Overall

    118
  • LCD FRUs

    138
  • Miscellaneous parts

    144
  • Ac power adapters

    146
  • Recovery discs

    147
  • Windows XP Professional Generic DVDs

    148
  • Windows Vista Business (32 bit) DVDs

    149
  • Windows 7 Home Premium (32 bit) DVDs

    150
  • Windows 7 Professional (32 bit) DVDs

    151
  • Windows 7 Professional (64 bit) DVDs

    152
  • Windows 7 Starter (32 bit) DVDs

    153
  • Windows 7 Ultimate (32 bit) DVDs

    154
  • Common service tools

    155
  • Appendix A. Notices

    157
  • Electronic emissions notices

    158

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