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Point blank 2 PCB graphic glitches

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IMACOMPUTA

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Aug 15, 2022
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Hi,
I have been dealing with an issue with a 2-in-1 Jamma switcher and plugging in/unplugging different boards quite a bit. At some point when doing this and making small adjustments to my PSU voltage, my Point Blank 2 board developed these graphical glitches.



PXL_20221204_014516976.jpg

I also have Tekken 2, so I pulled the top board from point blank 2 and tried it with Tekken 2 and had similar graphical issues. So I'm pretty sure I've narrowed it down to that Sony top board. It was working perfectly fine hours prior before I started messing around in there. Does anyone know what could have caused this and how to fix it? I bought this thing with a bad sony board. The one that seems broken now was a replacement. I'd really rather not have to buy yet another one of these!

Thanks for any help or suggestions.
 
Used a hot air reflow station on all the chips. Replaced the C16 capacitor and added a cap to C11 (it was missing since I got it).
Looks like I fixed most of the corrupted graphics, but there are still some squiggly lines.. anyone have any tips on clearing this up?
PXL_20221205_051533170.jpg
(you can see it midway down the lower two games and across "Play Against.." on the bottom right.
 
Ok.. so it had the problem again and I started pushing on chips on the PCB and got it to change. Upon closer inspection it actually seems like it might be my Jamma harness. I positioned the board a certain way where it's now working perfectly.

Does that check out? Could these kinds of video artifacts be caused by bad connections at the Jamma connector?
 
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