Midway SportStation PCB help!

esqueleto

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I've got a Vegas pcb that plays fine but has an audio issue. Whenever speakers are hooked up, it's plays a white noise at full volume whenever game sounds are supposed to be present, and the volume control in the menu or coin door has no control over it. I have tried two different compact flash drives from arcade services, voltage, sound eprom and self check have all been verified and passed. I'm getting a flashing yellow on LED 8 indicating audio is "locked up". joeybagadonuts was kind enough to share his knowledge but I couldn't quite get there. Anybody got any suggestions.

https://imgur.com/a/Ol1BM
 
Sucks that the rom wasn't the issue. I'm sure you checked but the -5v is required for sound on most Midway pcbs of this area. What is the big LED indicating when the game is running?
 
To close out this thread I replaced the DAC at U5 (AD 1866R) and the boards works perfectly!
 
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