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I have two Tron machines and one is having issues with the 5 volt dropping to 3.3 when the video cable is plugged in and will not boot. I have rebuilt both suit cases, 90412 boards and everything works in just one cabinet. The oil cap looks to be new on the bad cabinet. Both are running 4900 monitors so I swapped chasis and it smoked a trace on the back of the board from the working game. Looking at the original chasis this has happened before as someone soldered that location of the trace.

I have tested with both cabinets side by side and plugged the monitor in from the working and did not drop voltage. Could this be a bad isolation transformer?
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