Gorf monitor interference - please watch youtube vids.

westal_sage

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Gorf monitor interference - please watch youtube vids.

Hi all - I posted some youtube vids of my Gorf game and the problems I am having with the monitor. It looks like "interference" - like if a microwave oven was running right next to it.

The vids are here:
http://www.youtube.com/watch?v=rLMr0Uru45Y
http://www.youtube.com/watch?v=rlwXxo7Ilso


It gets way worse with the audio board connected - the audio clips cause massive interference. The 2 vids show the difference with the audio board connected and disconnected. It looks worse in person - e.g. the vid with audio off looks pretty darn good, but in person even that looks quite crappy - kinda like the rabbit ears need adjusting on an old tv set.

It's not the monitor - this is the 3rd monitor I've hooked up and all show the same behavior - this one would look really great if I can get rid of the interference - great colors, focus, etc.

When I bought the game, it had already been fitted with a switching power supply. Could that possibly be the whole problem? Like maybe it's a cheapo switcher?

I've reflowed solder to all connectors, taken the board cage all apart and cleaned everything there. Just getting to my wits end on what to try and rebuild or replace next. Thanks in advance or any help and suggestions you have!
 
Completely fixed...

This pretty much turned out to be a noisy switching power supply. Well, about 20% of the interference cleared up when I realized they had fed the mains to the PS from the output of the monitor's iso xformer, and I rewired that. But the vast majority of the interference (every single bit that was remaining) was cleared up by swapping in a different PS. I even have about a 15 year old computer PS with a -5V rail on it running things now - it looks absolutely beautiful and interference-free.
 
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