There is no such thing as a Rottendog MPU replacement.
The driver board...I'd rather have the OEM board.
May I suggest, that you've blown something on one of those two boards.
You need to send them both to a pro. That MPU goes for at least $450, so send it to someone you trust if it's not me.
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The Place to go for Pinball Repair Info