OSSC and sound noise

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  • #26572
    romulofernandes
    Participant

    Hello everyone, how are you doing?

    I recently got a broken OSSC that has perfect video image, but actually outputs sound noise all the time. I was wondering what I could start looking for problems. Like I said, no matter what the input, the OSSC (1.6 btw) outputs constant noise. If I plug something in the SCART port for example, the noise is mixed with the noise. I suspect the cristal clock, but not sure if anyone with a broken one would expect just noise or not working-at-all sound (like when you short it). I checked the board traces and they also seem fine.

    Any ideas? Thanks.

    Edit: Wondering…..if the problem is just the audio, can I use a non-aud firmware and turn off audio completely? I know I can short the crystal on PCM1862 (or just desolder it).

    #26624
    marqs
    Participant

    DVI TX mode disables audio so you can use that option if you can’t get audio issue fixed (replacing crystal and PCM1862 could be worth a try).

    #26634
    romulofernandes
    Participant

    Thanks for the input. I flashed 0.83 firmware without sound and the issue disappeared (as well as the sound xD). Anyway, SCART passthrough is working correctly and I’ll use that until I replace the codec or the crystal. I don’t own an oscilloscope and I was thinking on getting a cheap chinese one, like the DSO150. Will that work with that crystal? I know the bandwidth is more than enough but don’t know about other specs. Thanks anyway 🙂

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