Latitude 9430/Latitude 9430 2-in-1 Service Manual

Removing the system board

1. Disconnect the I/O daughter board FPC cable from the connector on the system board.
2. Disconnect the USH daughter board FPC cable from the connector on the system board (For the systems shipped with USH daughter board).
3. Disconnect the power button with fingerprint reader FPC cable from the connector on the system board (For the systems shipped with power button with fingerprint reader assembly).
4. Disconnect the display cable and camera cable from the connector on the system board.
   NOTEFlip open the display cable latch from the two tabs on the top side of the latch. Hold the left and right sides of the cable's connector head and gently disconnect the display cable in a direct upward motion to prevent damage to the connector.

   

   

5. Disconnect the left speaker cable from the connector on the system board.
6. Disconnect the Proximity sensor RF board FPC cable from the connector on the system board.
7. Disconnect the clickpad FPC cable from the connector on the system board.
8. Disconnect the LED board FPC cable from the connector on the system board.
9. Disconnect the system fan cable from the connector on the system board.
10. Loosen the single captive screw that secures the WWAN Darwin cable bracket to the system board.
11. Lift the WWAN Darwin cable bracket off the system board.
12. Use a plastic scribe and disconnect the two WWAN Darwin cables from the connectors on the system board.
    CAUTION Disconnect the Darwin cables from the system board in a direct upward motion to prevent damage to the connector's pins.

    

    

13. Unroute the white/gray WWAN main antenna cable and black/gray WWAN antenna cable from the metal clips on the system board.
14. Remove the three (M2x4) screws that secures the USB Type-C bracket to the system board.
15. Remove the four (M1.6x2.5) screws that secure the system board to the palm-rest assembly.
    CAUTION Do not remove the screw which is used to secure the base cover hook in place.

    

16. Hold the left side of the system board and partially lift the system board from the system.
    CAUTION To prevent obstructions while lifting the system board, you should clear the area around the system board of cables, FFCs, FPCs, and any adhesive items.

    NOTE For WWAN configurations, after removing the defective system board from the system, install the old shielding cover back to the defective system board. Do Not discard the shielding cover. The system board must be returned with the cover.