Dell D15S Service Manual page 53

Steps
1. Align and lower the system board into the system until the connectors at the back of the system board align with the slots
on the chassis, and the screw holes on the system board align with the standoffs on the system.
2. Replace the four screws (6-32) and the single standoff screw (M2x4) screw to secure the system board to the chassis.
3. Reconnect the intrusion switch cable to the connector on the system board.
4. Reconnect the system board power supply cables to the connector on the system board.
5. Reconnect the power button switch cable to the connector on the system board.
6. Reconnect the system fan cable to the connector on the system board.
7. Reconnect the processor power supply cable to the connector on the system board.
8. Reconnect the SATA cables to the connectors on the system board.
9. Reconnect the SATA power cable to the connector on the system board.
10. Reconnect the internal speaker cables to the connector on the system board.
Disassembly and reassembly 53