iFixit

We recommend placing the computer on a soft cloth from this point on to prevent damaging the logic board.

Turn over the computer and open it.

Remove the 2 Phillips screws (3mm) from the edges of the keyboard area.

Remove the 4 mm Phillips screw from the lower left corner.

Before you can yank the upper case off, you must disconnect the trackpad connector, the blue and white power cable, and speaker cable as described in the next steps. Be especially careful with these cables; never pull directly on the cables, but use a spudger to pry up the connector directly.

Lift the upper case and use a spudger or your finger to disconnect the trackpad connector hidden beneath the white plastic tab. Due to model variatons your trackpad connector may be different than the one pictured.