Dell Latitude 9420 Service Manual page 48

NOTE: Do not remove the system board together with the heat-sink, as this may damage the I/O daughter board, I/O
daughter board FPC, and system board. The system features an I/O daughter board FPC which is connected to the system
board underneath the heat-sink, as a result, the heat-sink must be removed first in order to disconnect the I/O daughter
board FPC from the system board and then remove the system board.
Steps
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.
48 Removing and installing components