Installing The System Board - Dell OptiPlex 5480 All-in-One Service Manual

4. Disconnect the microphone-module cable from the connector on the system board.
5. Disconnect the SIO-signal cable from the connector on the system board.
6. Disconnect the speaker cable from the connector on the system board.
7. Disconnect the audio-board cable from the connector on the system board.
8. Disconnect the SIO-power cable from the connector on the system board.
9. Disconnect the display cable from the connector on the system board.
10. Open the latch and disconnect the power-button board cable from the connector on the system board.
11. Disconnect the display back-light cable from the connector on the system board.
12. Disconnect the PSU-fan cable to the system board.
13. Disconnect the PSU cable to 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.
1. Power-supply unit (PSU) connector
3. Processor
5. Camera cable connector
7. System-fan cable connector
9. LPC debug card connector
11. SIO-signal cable connector
13. Audio-board cable connector
15. Speaker cable connector
66 Removing and installing components
2. Intrusion switch
4. Display back-light cable connector
6. M.2 2230/2280 solid-state drive/Intel Optane PCIe connector
8. Memory module
10. Hard-drive connector
12. SIO-power cable connector
14. Microphone-module cable connector
16. Coin-cell battery