Anyone know if this is a rom issue??? It happens at the start of a round and sometimes during game play you can see a boxing glove on the edge of the screen like it's overlapping or something..
If the double image is intermittent, only happening at the start of the round and sometimes during game play, it will be difficult to narrow down the problem. First of all, look for any Fujitsu IC's on the board. They are known for a high failure rate. You might want to try jumping any Fujitsu IC's on the video board and see if the problem goes away.
I believe 3B and 4B on the video pcb generates the horizontal position for the champion. As you can see, those signals go to 1F, 2F, 3F, and 4F. This might be a good place to start looking. Also, make sure the IC's at1F-4F are 74F, not 74LS.