Gamecube Power Board Wiring Diagram

I want to ask if someone who is more experienced with the gamecube then I am can show me like a Wiring Diagram of the Gamecube's Power Board? My Gamecube doesn't take any 3rd party controllers and when I connect my nintendo gc controller it disconnects most of the time, but it disconnects completely almost when I start a game. I have a Multimeter, but I'm a little new to that as well so I just need a wiring diagram for the gamecube so I can try to check the power board on my gamecube with the multimeter.