Response from Jonathan: Michael,

It looks like you’re experiencing some sort of sync issue with the bottom monitor on your Nintendo Playchoice arcade cabinet. It’s possible that the sync wire that runs from your board to your monitor is not making a good connection. It could have come out of the connector, it could have been cut or damaged over time, the pin that the wire connects to could need some solder touch up on the monitor chassis, etc. Make sure you check these areas for issues. If you do end up removing the monitor chassis from your cabinet, you might try looking for cracked or cold solder joints on it while you have it out as these can cause issues such as this.

If the problem continues after checking the sync wire and touching up bad solder joints then it’s possible that some electronic parts could have died on your monitor chassis. The most common monitor in most Nintendo cabinets is the Sanyo 20ez but there are some others. At this point, it’s a good idea to compare your chassis to the pictures on the What’s My Monitor page by Bob Roberts so you know exactly what monitor is in your game. Please let us know what monitor chassis you have and we’ll try to give you a better diagnosis of what’s going on with it.

Hope that helps. Thank you for your question and good luck with your repair.