MacBook Unibody Model A1278 Mid Wall Replacement

With the case closed, place the Unibody top-side down on a flat surface.

Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical.

The access door should now be raised enough to lift it up and out of the Unibody.

Grab the white plastic tab and pull the battery up and out of the Unibody.

Remove the following eight screws securing the lower case to the chassis:

One 3 mm Phillips screw.

Three 13.5 mm Phillips screws.

Four 3.5 mm Phillips screws.

Using both hands, lift and remove the lower case off the upper case.

Remove the four 10.3 mm Phillips screws securing the mid wall to the upper case.

Lift the mid wall out of the upper case.