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Dell Latitude 7400 Service Manual

Removing the system board

  1. Follow the procedure in before working inside your computer.
  2. Remove the base cover.
  3. Remove the battery.
  4. Remove the memory.
  5. Remove the SSD.
  6. Remove the WLAN card.
  7. Remove the heatsink-fan assembly.
  8. Remove the power adapter port.
  9. Remove the display assembly.
NOTE System board can be removed with heatsink assembly installed, this simplifies the procedure in an event of power button, keyboard and palmrest assembly replacements.
  1. Remove the single (M2x4) screw on the metal bracket over the display cable connector on the system board [1]
  2. Lift and remove the metal bracket [2] to disconnect the display cable from the system board [3].
    metal bracket [2] to disconnect the display cable
  3. Disconnect the display cable [1] and unroute it from the metal bracket on the system board [2].
    Disconnect the display cable [1] and unroute it from the metal bracket
  4. Remove the single (M2x4) screw [1] and remove the metal bracket over the WWAN Darwin antennae cable [2].
    single (M2x4) screw [1] and remove the metal bracket
  5. Disconnect the power button (with finger print reader) cable from the system board [1].
  6. Disconnect the WWAN Darwin antennae cables [2] from the system board.
    antennae cables [1] and WWAN Darwin antennae cables
  7. Remove the two (M2x4) screws [1] and lift up the USB Type-C bracket from the system board [2].
    two (M2x4) screws [1] and lift up the USB Type-C bracket
  8. Disconnect the coin cell [1], speaker cable [2] and the LED daughterboard cable [3] from the system board.
    coin cell [1], speaker cable [2] and the LED daughterboard cable [3]
  9. Disconnect the USH daughterboard [1] and touchpad cables [2] from the system board.
    USH daughterboard [1] and touchpad cables [2
  10. Remove the two (M2x2.5) screws on the DDR ESD bracket [1] and lift to remove it from the system board [2].
    wo (M2x2.5) screws on the DDR ESD bracket
  11. Remove the two (M2x4) screws [1] and remove the system board from the palmrest assembly [2].
    NOTE For models shipped with a fingerprint reader or WWAN antennas, there are three (M2x3) screws securing the system board to the computer.
    Remove the screws and system board

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