Aerofighters all blue - schematic anywhere?

tkeahi

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I'm working on a aerofighters JAMMA pcb...It works fine, but color output is all blue (no red and green at all). It does this in both of my JAMMA cabs so I know its not the wiring or monitor.

Does anybody know where I can download a schematic for this PCB? I can find the manual online pretty easily but no schematic. Thanks!
 
I don't know where there's a schematic, but you could probably just follow the video wiring back from the edge of the pcb and quickly get to the transistors and chips that control the color output. Are you seeing an image? Is it just missing the red's and green's, or are they also blue?
 
Just use a logic probe and check the palette ram for activity. If it has transistors on the RGB lines check to see if they all have voltage coming out.
 
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