Installing The System Board - Dell Latitude 5520 Service Manual

Steps
NOTE: The system board can be removed and installed along with the thermal module attached, to preserve the thermal
bond between the system board and heat-sink. In order to do so, technicians must remove the two M2x5 screws securing
the system fan to the palm-rest assembly.
1. Disconnect the fingerprint cable from the connector on the system board.
2. Peel the adhesive tape and disconnect the sensor-board cable from the connector on the system board.
3. Remove the three screws (M2x4) that secure the USB Type-C bracket to the system board.
4. Remove the two screws (M2x3) that secure the eDP cable bracket to the system board.
5. Lift the eDP cable bracket away from the system.
6. Peel the tape that secures the display cable to the system board.
7. Using the pull tab, disconnect the display cable from the connector on the system board.
8. Disconnect the eDP cable from the connector on the system board and unroute it from the routing guide.
9. Open the latch and disconnect the USH board cable from the system board.
10. Open the latch and disconnect the LED board cable from the system board.
11. Open the latch and disconnect the clickpad cable from the system board.
12. Pry the coin-cell battery off the palm-rest assembly and remove it from the routing guides on the palm-rest assembly.
13. Remove the three screws (M2x3) that secure the system board to the palm-rest assembly and keyboard assembly.
14. Lift the system board off the palm-rest assembly and keyboard assembly.
15. Flip the system board and disconnect the coin-cell battery cable from the connector on the system board.

Installing the system board

Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the system board and provides a visual representation of the installation procedure.
Removing and installing components 59