Museum of the Game® & International Arcade Museum® Forums

Hey everyone, new forum member here. I am very new to the arcade cabinet ownership journey, I recently acquired my first arcade cabinet, a red tent, and I excitedly picked up a few boards from someone else here on the forums. I'm having an issue with one of the boards though which seems quite odd. I get no audio on side A of my cabinet. I'm quite certain the issue must be with the PCB, as I have a Tennis PCB and a SMB1/Gradius board and both get sound on both sides with no issues.

I've looked up the pinout diagram for the connectors and carefully cleaned the X/20 pins with a pencil eraser and 99% isopropyl alcohol in case it was just a bad connection, but no luck still. Visually inspecting the board, I can see a couple suspicious traces on the backside that look like they've potentially been damaged, but I'm not sure really what I'm looking at in terms of the circuitry of a Vs board. The strange thing is that literally everything else works fine about the board as far as I can tell, the game plays fine and I get sound from the B side of the cabinet.

Does anyone here have any suggestions or experience debugging this kind of issue? In case it's important, the game installed on the board is Balloon Fight, though it seems to be a romhack/reproduction since the PPU type is 0001, as opposed to the 0003 PPU which seems to be what the original game used. I doubt that's relevant, but I figured I would add that info just in case.

Thanks in advance for any help!

Edit: PS sorry for the pictures being kinda low quality, the forum kept complaining that they were too big, but I worry maybe it will be harder to identify the problem at this level of quality.
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