Dell XPS L502X Service Manual page 22

4 Disconnect the antenna cables from the Mini-Card(s).
5 Remove the screw that secures the Mini-Card to the system board.
NOTE:
Your computer can only support either a WWAN Mini-Card or a TV tuner
module in the full Mini-Card slot at a time.
1 antenna cables (2)
3 screw
6 Lift the Mini-Card(s) out of the system-board connector.
22
Wireless Mini-Card(s)
1
2 Mini-Card
4 system-board connector
4
3
2