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So I'm diagnosing my Gyruss cabinet. Both amplifier chips were no good so I swapped them out and re-installed the heatsynchs on top using thermal paste. Unfortunately, the issue persists - it has no sound at all. I'm looking for guidance on where I should check next and how to go about checking whether the next piece is good or bad.

A friend said:

"The game uses two Z80 microprocessors, one 6809 microprocessor, and one 8039 microprocessor. For sound it uses five AY38910 PSGs and a DAC."

Wondering if we're on the right track or not.
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