Dell Inspiron 15 (N5040, Mid 2011) - Manual (Page 28)

28 Wireless Mini-Card
4 Press the other end of the Mini-Card down into the slot on the system
board and replace the screw that secures the Mini-Card to the system
board.
5 Connect the appropriate antenna cables to the Mini-Card you are
installing. The following table provides the antenna cable color scheme for
the Mini-Cards supported by your computer.
6 Replace the keyboard (see "Replacing the Keyboard" on page 17).
7 Replace the battery (see "Replacing the Battery" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.
8 Install the drivers and utilities for your computer, as required.
NOTE: If you are installing a Mini-Card from a source other than Dell, you must
install the appropriate drivers and utilities.
Connectors on the Mini-Card Antenna Cable Color Scheme
WLAN (2 antenna cables)
Main WLAN (white triangle)
Auxiliary WLAN (black triangle)
white
black