Unless I've got my pinouts wrong (which is possible I'm going to double check using a voltmeter in a minute) I've got the following
12V to a voltage regulator with a 8V output to the 7.5V input for the screen
GND (mobo), GND (PCB found in the scart plug), GND (voltage regulator) and GND (screen) all connected together
5V out (mobo) to 5V in (screen)
Composite video out (mobo) to Composite wire (scart PCB) to Composite video in on the screen
Left audio out (Mobo) to left audio in (screen)
Right audio out (Mobo) to left audio out (screen)
- UPDATE -
I think I figured out why my screen isn't turning on, the voltage regulator is outputing 10.25V to the screen, thats way too much (highest I heard it can take is 8.5)
Problem is I don't know why its outputting 10.25v, it should be outputting 8V
I made up a regulator like this
http://www.rason.org/Projects/regulator/regulator.htm
where
R1 is 470 ohms
R2 is 220 ohms
the input is connected to the 12V output of the Regulator board from the gamecube with a 4ohm resistor between (to limit current to about 1A since it is a 1A regulator)
I used a 7805 btw
- UPDATE 2 -
I Heard a click and the screen powered on but only displayed a black screen (it glowed if that makes any sense) then all of a sudden the V regulator is only outputing about 3.15V the power regulator board is outputing a very small voltage at the 12V pin and ground is at 2.73V for some reason (not at the board though, its 0V at the gamecube but the regulator ground and the scart ground is all 2.73V