Dell Inspiron 15 (3531, Mid 2014) - Manual (Page 45)

Procedure
1 Peel off the tape that secures the display cable to the system board.
2 Disconnect the display cable, power-adapter port cable, and speaker
cable from the system board.
1 power-adapter port cable 2 display cable
3 tape 4 speaker cable
3 Remove the screw that secures the system board to the computer base.
4 Lift the system board at an angle and release the ports on the system
board from the slots on the computer base.
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