Author Topic: [PC Engine Duo] Missing parts.  (Read 1177 times)

crossmanbx

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Re: [PC Engine Duo] Missing parts.
« Reply #15 on: May 02, 2018, 05:25:22 AM »
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.

 
 
« Last Edit: May 02, 2018, 05:31:02 AM by crossmanbx »

soop

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Re: [PC Engine Duo] Missing parts.
« Reply #16 on: May 02, 2018, 09:46:19 AM »
Hey, well done!!  And thanks for posting the solution!  One more duo saved from the scrap heap ^_^