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Latitude 9520/Latitude 9520 2-in-1 Service Manual

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Removing the system board

Prerequisites

  1. Follow the procedure in before working inside your computer.
  2. Remove the microSD card.
  3. Remove the SIM card tray.
  4. Remove the base cover.
  5. Remove the solid-state drive.
  6. Remove the WWAN card.
  7. Remove the speakers.
  8. Remove the battery.

About this task

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

Removal 1

Removal 2

NOTE: Replacement system boards are pre-assembled with heat sink and fan. Do not remove the heat sink and fan from system board. The system board can be replaced together with the heat sink and fan attached.

Steps

  1. Remove the single (M1.6x3.5) screw that secures the display-cable bracket to the system board.
  2. Push the display-cable bracket from the bottom edge to release the bracket from the securing peg, and remove it from the system.
  3. Disconnect the display cable and camera cable from the system board.
    NOTE: Users must disconnect the display cable from the system board by pulling the pull tab in a direct upward motion to prevent damage to the connector.
  4. Remove the single (M1.6x4.5) screw that secures the wireless module bracket to the system board.
  5. Lift and remove the wireless module bracket away from the system board.
  6. Use a plastic scribe and disconnect the Darwin antenna cables from the wireless module, then unroute the cables from the routing guides on the system board.
  7. Disconnect and unroute the WWAN antenna cable from the routing guides on the system board.
  8. Remove the two (M2.5 x 5) screws that secure the two system board hooks to the system board.
  9. Disconnect the USH daughter board FFC cable, WWAN Darwin cable, and touchpad FPC from the connector on the system board.
    NOTE: To disconnect the WWAN Darwin cable from the system board, insert a plastic scribe close to the rear side of the connector, and carefully pry in an upward direction.
  10. Disconnect the I/O daughter board data FPC cable and the I/O daughter board data cable.
  11. Remove the ten (M1.6x3.5) screws that secure the system board to the palmrest and keyboard assembly and remove the system board from the system.

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