Donkey Kong 2 layer PCB Sound Issue

dezbaz

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Donor 4 years: 2011, 2013-2014, 2016
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Hi Guys

This PCB is 2 layer and has no digital or Analogue sound working

NOTE: I am running it using a JAMMA adapter - it has an amplifier on it so needs no monitor for amplification

I have replaced:
  • 8035 MPU chip and socket
  • DAC Chip and socket added
  • LM324 chip and socket added
  • Cap C13
  • Transistor Q1 (2SC1815)
  • EPROM 3H, replaced with known working one

Any thing else I can try guys?
 
As all the analogue sounds are missing, I think there would be a problem down the line after where the digital and analougue signals are joined. C13 and Q1 are at the end of the line, so keep working your way backwards from there, maybe C15? What about the volume pot, I don't know if a bad one could kill both digital and analogue?
 
Verify that the amp on your adapter is working. Its uncommon for both analog and digital sounds to go out, its usually one or the other it seems.
 
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