My OSSC 1.6 is dying

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  • September 15, 2020 at 8:23 PM #41364
    marqs
    Participant

      U8 is the audio ADC which is somewhat surprising. If you have tools and skills (and expired warranty), you could try lifting its pin 8 to see if it fixes your sync issues.

      September 15, 2020 at 8:32 PM #41365
      bni
      Participant

        ok, I noticed just before when testing, that in the 2 minutes it does work, before components gets too hot, there is no sound. And now I remember just before the OSSC broke down there was some ‘crackling’ in the speakers that I never noticed before.

        I have nothing to lose with this board really as warranty is gone and sending for repairs is about the same expense as getting new one.

        I don’t really have the skills, those pins looks awfully small for the tools I have. What would be expected to happen if I cut pin 8?

        September 15, 2020 at 10:16 PM #41367
        marqs
        Participant

          If you lift or cut U8 pin 8, analog supply voltage is removed from (the presumably damaged) audio ADC, effectively muting its output and removing the cause for excessive current drain.

          September 16, 2020 at 9:26 PM #41379
          bni
          Participant

            I lifted pin 8 using a small needle and that did indeed fix my issue. Temperatures on U6 and U8 are normal now and OSSC seem stable. No audio anymore thru the OSSC of course.

            As to what could have caused the damage in the first place. I mentioned I recently got a new Amiga 1200 and this issue happened sort of the same time as I got it, although not sure.

            Is it possible for the sound output from my Amiga could have destroyed the ADC in my OSSC? Or is it more likely this was coincidental and I just had bad luck with a failing chip?

            September 18, 2020 at 8:25 PM #41397
            marqs
            Participant

              A1200 audio level shouldn’t be such high that it could damage the chip. Aging / failing by itself doesn’t sound like a likely scenario either, though.

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