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jormungardian

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Hi all, I recently picked up a Hiphopmania Complete Mix 2 Arcade and I can't seem to figure out what's wrong with the audio and I can't find a lot of info online for it. I hope someone has any insight on how to troubleshoot the issue.

The game plays properly and there's no diagnostics issues at all. The amplifier and speakers are good, I connected some other input and verified they work fine. This leads me to believe the PCB isn't producing the sound but I can't find any info on this Konami GQ753 board (attached pictures) or diagram. When I go into the game and play I can hear a faint sound that almost resembles the drum but it's very faint to discern. If there's anything y'all can suggest or docs to reference I would greatly appreciate it and thank you in advance!

The only other issue is a very loud buzzing from the monitor, I think maybe the flyback. But I don't think they would be correlated.
 

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I just got a machine today which has the exact same board. My problem though is with a test (COL RAM) actually failing. I'm quite certain COL stands for color here, because funny enough, the colors of the test screen are indeed wrong/swapped :) I might or might not have found the culprit on the board, see other photo.

I assume you already did inspect your board thoroughly for any leaks yet? In any way, let's share our findings here regarding this board as we go :)
 

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