Dell XPS 15 (L502X, Early 2011) - Manual (Page 84)

84 USB Board
10 Lift the connector latch and disconnect the USB-board cable from the
connector on the USB board.
11 Remove the three screws that secure the USB board to the top cover.
12 Carefully ease the connectors on the USB board out of the slots on the top
cover and lift the USB board off the top cover.
Replacing the USB Board
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the connectors on the USB board with the slots on the top cover and
place it on the top cover.
3 Replace the three screws that secure the USB board to the top cover.
4 Slide the USB-board cable into the connector on the USB board and press
the connector latch down to secure the cable.
1 screws (3) 2 USB board
3 USB-board cable connector 4 USB-board cable
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4