You haven't mentioned the make and model of your monitor or whether or not you've had a capkit installed. Remember that some brands of monitors (like Hantarex for example) are real finicky about how the sync signal is connected.
It's a 20-EZ (I hope I got that right). I have two of these in a Nintendo vs. cab that was converted into a Wrestlefest. The board's video output was split and being sent to both monitors. I have the same quality picture on both monitors.
I was told that the game used to work just fine (it was taken apart when I got it). The wires to the monitors were cut, so I had to reconnect them myself. When I did, I got the pic referenced in my original post. I couldn't find anything wrong with the connections, but I wasn't getting a good pictures. I needed help to zero in on the problem.
I didn't get around to looking at this more, yet, due to the holidays.
Thanks again for your help.
Mario