Burger Time Cocktail Monitor wave issue

The monitor is good. It is the power supply. Thanks to @mecca for looking at it for me. Going to put the rebuilt original power supply in there. I'll keep you all updated. They used the service plug to draw ac power to the switching power supply and that somehow is causing interference.
I thought we had switching power supply and the thick gauge black wire/plug outside the game via the coin door and connected to an extension cord to isolate it when we were on the phone the other day @1970. Why did it continue to wave in that scenario? Any idea why this would happen @mecha or @tron guy?

I knew that set up was the problem all along
 
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