Remove the four screws holding the mainpower board to the rear cover.

Starting at a corner use a spudger to gently pry up the main board. Work the spudger around the edges of the main board until it lifts easily.

Before completely removing the main board, lift up on the grey tape holding down the wires and pull it away from the back cover.

*Optional* You can also disconnect the wire harness if necessary, the process is the same as in Step 2.