Installing The System Board - Dell OptiPlex 5400 Service Manual

Steps
1. Disconnect the display back-light cable from the connector on the system board.
2. Disconnect the display cable from the connector on the system board.
3. Disconnect the PSU cable from the connector on the system board.
4. Disconnect the PSU fan cable from the connector on the system board.
5. Open the latch and disconnect the power-button board cable from the connector on the system board.
6. Disconnect the speaker cable from the connector on the system board.
7. Disconnect the microphone-module cable from the connector on the system board.
8. Disconnect the SIO-signal cable from the connector on the system board.
9. Disconnect the SIO-power cable from the connector on the system board.
10. Disconnect the audio-board cable from the connector on the system board.
11. Disconnect the system fan cable from the connector on the system board.
12. Disconnect the touchscreen cable from the connector on the system board.
13. Disconnect the camera cable from the connector on the system board.
14. Remove the nine screws (M3x5) that secure the system board to the display-assembly base.
15. Lift and remove the system board from the display-assembly base.

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 connectors on your system board.
Removing and installing components 67