The display hinge screws must be removed and the hinges flipped up to free the motherboard or I/O board (both of which are also secured by additional screws).

One display cable connector is hidden on the underside of the motherboard, but we discovered later that it's easy to access with the hinge trim cover removed.

Besides the motherboard and I/O board, there are breakout boards for the power button, macro buttons, trackpad, and SSD.

The power button board lies beneath the motherboard—modular, but troublesome to access.