Weird Neo Geo Cab Issue

SSilver2k2

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Lo all!

Not sure if this should go in the monitor forum or in here, so i'm erring on the side of general repair.

I finally found a new neo geo power supply for a totally untested neo geo machine I got for $50. I was able to rewire the power switch, and finally get it to turn on. I threw in an old SF2 board to test the jamma harness, and everything comes on, except the monitor is making weird images. I can see sf2, but it looks like its blinking on and off real fast and that theres a vertical hold issue as well. When I throw in the neo geo board, it comes up fine (though with a calendar error which is another issue altogether, luckily I have a spare neo geo board.)

Any thoughts? On my other neogeo cabinet, I can throw in any board in there and it plays fine.
 
(psssst.... the calendar error is easy to fix! check my repair logs...)
 
well, i've already replaced the battery, and I just got in new 32.7xx crystals in to replace the other crystal. If that doesn't work, I'm going to try to resurrect it with a UNIBIOS, or send it to you ;)
 
just a small bump...

any ideas why the monitor would roll with a sf2 but not with a neo geo board in it?
 
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