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Inspiron 7400 Service Manual

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in Before working inside your computer.
  2. Remove the base cover.
  3. Remove the 4-cell battery or the 6-cell battery, whichever applicable.
  4. Remove the M.2 2230 solid-state drive or the M.2 2280 solid-state drive/Intel Optane H10, whichever applicable.
  5. Remove the fan (4-cell battery) or the fan (6-cell battery), whichever applicable.
  6. Remove the heat sink (for computers with integrated graphics card) or the heat sink (for computers with discrete graphics card), whichever applicable.

About this task

The following image indicates the connectors on the system board.

Image:System-board connectors

  1. Display cable
  2. Power-adapter port cable
  3. Speaker cable
  4. Keyboard cable
  5. Keyboard-backlight cable
  6. Touchpad cable
  7. I/O-board cable
  8. Fingerprint-reader cable
  9. Coin-cell battery cable
  10. Wireless-card bracket and antenna cables

The following images indicate the location of the system board and provides a visual representation of the removal procedure.

Image:Removing the system board

Image:Removing the system board

Steps

  1. Peel the tape that secures the display-cable latch to the system board.
  2. Lift the latch and disconnect the display cable from the system board.
  3. Remove the two screws (M2x4) that secure the right-display hinge to the palm-rest and keyboard assembly.
  4. Pry open the right-display hinge.
  5. Remove the screw (M2x2.5) that secures the wireless-card bracket to the system board.
  6. Lift the wireless-card bracket off the system board.
  7. Disconnect the antenna cables from the system board.
  8. Peel the tape that secures the antenna cables from the system board and move the antenna cables off the system board.
  9. Disconnect the coin-cell battery cable from the system board.
  10. Open the latch and disconnect the disconnect the fingerprint-reader board cable from the system board.
  11. Peel that tape that secures the I/O-board cable connector latch to the system board.
  12. Open the latch and disconnect the I/O-board cable from the system board.
  13. Open the latch and disconnect the touchpad cable from the system board.
  14. Open the latch and disconnect the keyboard cable from the system board.
  15. Open the latch and disconnect the keyboard-backlight cable from the system board.
  16. Disconnect the speaker cable from the system board.
  17. Disconnect the power-adpater port cable from the system board.
  18. Remove the screw (M2x2) that secures the system board to the palm-rest and keyboard assembly.
    NOTE This step only applies to computers shipped with a 6-cell (78 Wh) battery configuration.
  19. Lift the system board at angle off the palm-rest and keyboard assembly.

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