iFixit

Remove the screws securing the motherboard to the upper case:

• A single 2.5 mm silver Phillips screw
• Four 3.7 mm black Phillips screws

Deroute the microphone and antenna cables through the slot in the motherboard.

Rotate the motherboard off the lower case.

The motherboard cannot be completely removed yet. It is still attached by the upper LCD's display data ribbon cable.

Using the flat end of a spudger, flip up the retaining flap on the upper display data cable ZIF connector.

With the pointed end of the spudger, pull the upper display data cable from its connector on the underside of the motherboard.

The motherboard is now free from the upper case.