I picked up a BDK yesterday. I played a game before packing it up and it sounded great because it has the flipper fidelity speakers installed. Got it home and plugged it in and - NO SOUND! None. I checked and reseeded all the cables from the power board to the CPU board. I checked all the cables to the speakers. I've tried all the basics. When I put my finger on the amp area of the CPU board I can hear a buzzing from the speakers.

Any help in troubleshooting this would be much appreciated!!!

I can hear a buzz when I put my finger on the amp.

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no.

I took the CPU out of ST and hooked it up to BDK. I got sound. I couldn't play it cause it thought it was ST but I could hear the coin door and menu button sounds. I believe the CPU board will need repair