[PC Engine Duo] Missing parts.

[crossmanbx]

Ok, i have found why ADPCM was dead.

IC503 was not grounding on pin 4. While looking closer, via near pin 5 of IC503 was corroded, that's why IC503 was not working.

So i put an electrical cable into the via and soldered each side of the pcb. It' s not pretty to see but it works. By the way, this stuff solved my main audio problem, i can now desolder Slipty's trick !

All audio problems were ground related, at least for me.





Thanks to the guy for these two diagram, I found them on this wonderful forum :





They are very useful !

After that, I took a second look to other vias, next to the cd side of the Duo.  I had to repair 2 others the same way.
CD works 100% now, just fine !

I'm waiting now for a RGB mod, and i have to 3d print an Hucard door cover too ! Mine was missing.

Thank you everybody for all your advices.

 
 

[soop]

Hey, well done!!  And thanks for posting the solution!  One more duo saved from the scrap heap ^_^