Dell Latitude 9420 Service Manual page 50

Steps
1. Align and place the system board on the palm-rest assembly.
2. Replace the four (M1.6x2.5) screws that secure the system board to the palm-rest assembly.
3. Replace the three (M2x4) screws that secures the USB Type-C bracket to the system board.
4. Connect the two WWAN Darwin cables to the connectors on the system board.
5. Route the white/gray WWAN main antenna cable and black/gray WWAN antenna cable in the metal clips on the system
board.
6. Align and place the WWAN Darwin cable bracket on the system board.
7. Tighten the single captive screw that secures the WWAN Darwin cable bracket to the system board.
8. Connect the system fan cable to the connector on the system board.
9. Connect the LED board FPC cable to the connector on the system board.
10. Connect the clickpad FPC cable to the connector on the system board.
11. Connect the Proximity sensor RF board FPC cable to the connector on the system board.
12. Connect the left speaker cable to the connector on the system board.
50 Removing and installing components