Dell XPS 630i Service Manual page 108

3 Remove the system board (see "Removing the System Board" on page 87).
4 Disconnect the REAR_LED_SENSOR cable from the master I/O board
(see "Master I/O Board Components" on page 101).
5 Gently push the release tab away from the chassis to release the rear LED
board and then slide it up and away from the computer.
1 release tab
6 Replace the system board (see "Installing the System Board" on page 88).
7 Replace the system cover (see "Replacing the Computer Cover" on
page 119).
8 Connect your computer and devices to electrical outlets, and then turn
them on.
108
Lights
1
2 rear LED board
2