Just a fix to a similar story. I Was having a very similar problem with my Parts Express 4" screen. Sometimes it would work, others it wouldn't. In one car it wouldnt work at all, hook it up to a TV, and it worked each and very time. I thought it might be Heat, Position, Car Voltage, Position of the inverter.
The problem? I had gotton 3 different Video Cables from the Rat Shack. EACH and every one of the failed. I tried everything, but everything always included one of those three cables. When I would test it on my TV I needed to test it on my TV I used a completely different cable that did NOT come from the Rat Shack. I figured one cable might go, or even two, but three bad cables?
So, Now that I have thrown those cables out, my Video is ROCK Solid. I know you said you tried swapping cables, but it might just be that you have more than one bad one.
Chainsaw
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-Jason
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