ah okay. When you say RGB board, you mean this:
http://img6.imageshack.us/img6/7410/1001820.png board right? That is actually called the inverter board, and that is the name it is generally called. If that is the board you removed, you dont actually need it. In older nintendo games, the signal is already inverted, so a board that does the inverting isnt even necessary. To bypass this board completely, follow the attached diagram. This makes it so the chassis is getting direct video from the game board since the inverter board isn't necessary in this case. Of course, your chassis still has problems even after fixing this. The solution to this problem is to either fix it yourself, or buy a whole new chassis. I would try replacing the fuses that I mentioned a couple of weeks ago, if you haven't already done so. After doing that, if it still doesn't work, you are probably SOL. It's just way too much work to do on your own, if you aren't an electrical engineer. At that point, I would either send it to somebody on KLOV to be repaired, or just buy a whole new chassis. That is all of the outcomes I can think of to get your game working again. Good luck and keep me posted.