GameStop GS3 GameCube Controller Motherboard Replacement

Open the controller by unscrewing the screws located on the back panel

Separate the two halves of the controller.

Remove the rumble-pack by unscrewing the screws located on on either side.

Remove the rumble pack to fully separate the two halves of the controller

Disconnect the motherboard from the front half of the controller by unscrewing the small screws around its perimeter.

The motherboard should separate and lift right out from the front half.