OSSC green led but nothing on the LCD display

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  • November 2, 2024 at 6:33 AM #63948
    Morpheus_79
    Participant

      Shall I check if the oscillator outputs the required frequency?

      Yes.

      The ‘display flashes + solid green led’ behaviour is somewhat similar to an OSSC without any firmware flashed onto it. I’ve seen similar behaviour on an OSSC with esd damaged flash memory… but since the op had nearly the same problem as you and fixed it by replacing the oscillator, it should be a better starting point. Especially since your OSSC sometimes works -> could be the oscillator delivering no stable clock.

      If the oscillator is fine: check the voltages on every voltage regulator too…

      November 2, 2024 at 7:09 AM #63949
      Ideal1st
      Participant

        Well, the oscillator is not oscillating. I was unable to read any waveform from it. So it must be dead, even though it gets it’s 3v power. I’ll start sourcing one somewhere.

        BTW, I checked the PSU also, it reads 5,3v while idle, should I give it a try swapping to a different one?

        November 2, 2024 at 9:13 AM #63951
        Morpheus_79
        Participant

          5.3V is not perfect… but should be okay. Afaik no component of the OSSC is directly connected to the 5V line (maybe except the 5V output of the HDMI-Port). But the ICs receive their power from the voltage regulators U5 (AP7361C) and U6 (TLV70033). U5 is able to handle 6V max and U6 can handle 5.5V max. So 5.3V is within their specs.

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