When removing and installing the logic board, take care not to damage the delicate microphone ribbon cable at the bottom left of the board.

Tilt the top of the logic board away from the rear enclosure.

As you tilt the logic board, pull the right speaker connector to the right and out of the way of the board.

Lift the logic board straight up and out of the iMac.

Be careful not to snag the board on any of the rear enclosure's screw posts.