Is there any way to get RGB output on NTSC gamecube?

I am building a GameCube portable, and I'm using an Intec screen. For those of you who don't know, the screen has its main driverboard attached to the back, but that only accepts RGB as an input. Then there is another board that has the sound and converts the gamecube's signal to RGB for the screen. I stupidly took the second board off, and I don't know where the wires all go, so I need to figure out how to get RGB from my GC. The only way I have seen is to buy a digital cable and cut it up, which I don't want to do. So can anyone tell me if I can get RGB from it, and if I can how? Or at least someone with the Intec screen tell me how the wires connect to the screen from the board?
Thanks!!
 
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