Unscrew the M screws and unplug the board battery. Your PS3 now does not know the date and time.

I messed up when I put it back together. The shield goes under the top half of the HDD cage.

Lift this side of the HDD cage and wiggle it. The pins can be tricky.

Remove the shield over the USB and WiFi controller

Remove the USB and WiFi controller. It lifts straight up. Remove the white tape.

Lift from this side to remove the motherboard shield.

The motherboard lifts right out