Dell Inspiron 17R 5720 Owner's Manual page 54

Procedure
1 Pull the pull-tab to disconnect the USB-board cable from the
USB-board connector.
2 Pull the pull-tab to disconnect the LAN-USB cable from the
system-board connector.
3 Make a note of the LAN-USB cable routing and remove the cable from the routing
guides on the computer base.
4 Peel off the LAN-USB cable from the computer base.
1
2
1 LAN-USB cable
3 USB-board cable
5 USB board
54
| LAN-USB Cable
3 4 5
2 system board
4 pull-tab