I've hit a wall. symptom is no sound. game fully boots and plays. I have done some work on the Vidiot (new RAM chips, recapped, new 1K sound pot, resocketed and burned new EPROM at U29, replaced 6803 in the sound section. replaced Q5 in the reset section and REPINNED EVERY CONNECTOR and HEADER PINS) I get no sounds of any kind at boot. All I get is a hum in the speakers that I can increase/ decrease with the front coindoor volume knob. I get no sound at front door sound test or vidiot sound test ( I do get the 2 flashes at the LED ). Also I get the same result with an original MPU and an Altek. any help would be much appreciated.