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adsa

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Hi All

2017-08-01 10.42.08_LI.jpg

Just my bloomin luck. I have one Taito F3 Mobo with perfect graphics but no sound, and another with sound but graphics glitches with the F3 Multigame Cart (Official cart no problems.) I found that there are 1cm horizontal lines racing across the screen. Interesting thing though is that when I touch the address bus next to of the Xilinx IC U3 (see piccy), then the parasitic noise goes away. Off the top of anyones head, can you advise what this could be???


I will replace the caps around the other boards sound chip and check the traces.
 
Right.
I now have the following sprite corruption on both Taito mobos with the Darksoft plugged in. Can anybody throw some light on what is happening please?

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And touching that part of the pcb changes it?
 
As of last night touching that part of the PCB does not change from corruption to clean graphics. The pictures shown are on both motherboards.

Does anybody have a schematic of the F3?
 
Got your board. I'll have a look. It sounds like a cold solder to me, maybe happened during transportation.
 
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