Dell Inspiron 15 (N5040, Mid 2011) - Manual (Page 70)

70 System Board
10 Remove the processor (see "Removing the Processor Module" on page 49).
11 Remove the Mini-Card (see "Removing the Mini-Card" on page 25).
12 Disconnect the speakers cable, USB-board cable, microphone cable, and
AC-adapter cable from the connectors on the system board.
13 Remove the two screws that secure the system board to the computer base.
14 Lift the system board at an angle and release the connectors on the system
board from the slots on the computer base.
NOTE: Based on the selection you made at the time of purchase of your computer,
the dimensions of the system board and the location of the system board
components may vary.
1 speakers cable 2 USB-board cable
3 microphone cable 4 AC-adapter cable
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3
2
1