Wrestlefest NO SOUND

Ironmike20

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I have 2 wrestlefest boards one displays a scrambled screen when it starts and the other plays fine, but has no sound. I was hoping I might be able to swap parts to get the sound working. When I turn the volume knob I get a loud buzzing sound, but thats it. I've heard the build quality on these boards are somewhat poor, so I hope someone else has come across this problem & was able to fix it. Thanks in advance for an help you can offer.
 
I'd just suggest swapping the parts near the volume knob. There's several caps probably in that area, you could swap the knob itself, and there may be a little audio amp there, it'll be a long chip with several legs but only in 1 line, not a dual-line like eproms or anything are. It should be fairly easy to find, another thing you can do is trace the 'traces' back from the speaker pin of the jamma connector and see what components it runs into. It could be a resistor that's opened up or something like that. It also could be whatever rom runs the sound.
 
Thank you for the advice, I didn't know where to begin. I really appreciate the help. I'll let you know if I have any luck.
 
Scrambled graphics is probably a couple of surface mount chips that need reflowing.
 
Looks like there is quite a bit of corrosion around the sound part of the board. It looks like I'm gonna need to do a lot of swapping...oh fun. Thank you all for your help.
 
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