Dell XPS 12 (9Q23, Late 2012) - Manual (Page 39)

Procedure
NOTE: Your computer’s Service Tag is located under the system badge. You must
enter the Service Tag in the BIOS after you replace the system board.
NOTE: Before disconnecting the cables from the system board, note the location
of the connectors so that you can reconnect them correctly after you replace the
system board.
1 Disconnect the coin-cell battery cable. See"Removing the Coin-Cell Battery" on
page 25.
2 Disconnect the power-adapter port cable from the system board.
3 Using the pull tabs disconnect the display cables from the system board.
4 Lift the connector latches and using the pull tabs disconnect the touchpad cable
and keyboard-backlit cable from the system-board connectors.
5 Remove the antenna cables from the routing guide on the system board.
See "Removing the Wireless Mini-Card" on page 15.
.
4
1
2
3
1 power-adapter port cable 2 display cables
3 touchpad cable 4 keyboard-backlit cable
6 Remove the screws that secure the system board to the palm-rest assembly.
Removing the System Board | 39