Pink/Red Artifacts in Picture

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  • February 4, 2021 at 6:46 AM #44983
    konch
    Participant

      I tried posting this to the general OSSC support thread but didn’t get any response. I thought someone here might be able to assist me.

      I purchased an OSSC 1.6 from VGP and am beginning to experience red/pink artefacts in the picture that it outputs. This unit was in storage but previously it was working fine. If you would like to see what I mean click here..
      Unfortunately I can’t find a way to share uncompressed video without requiring an account but the photo should give you and indication of the problem. These artefacts will move around the picture over time.

      Could someone confirm if this is a hardware problem and if so help guide me through fixing it or point me in the right direction? I have a multimeter and a basic understanding of electronics. What I don’t have is money to buy a new one.

      Of note:
      -This occurs on AV1/AV3.
      -The test pattern at boot displays fine.
      -The brand of analogue cables I am using are retrogamingcables.co.uk/Extron brand.
      -This occurs with multiple known working HDMI cables on multiple known working monitors/TVs.
      -I have tried splitting RGBs/YPbPr to the OSSC and a PVM. PVM picture is fine.
      -I have tried turning off every other appliance in my apartment and used different power points.
      -I have tried changing every setting.
      -I have tried upgrading to the latest firmware.
      -I have tried cleaning the unit with non residual contact cleaner

      Thank you for taking the time to read all this.

      February 8, 2021 at 12:07 AM #45092
      marqs
      Participant

        One possibility is that the HDMI connector has bad contact on the PCB – I’ve seen this kind of issue when one of the TMDS differential pairs have just one line properly connected. It might be also worth testing an earlier fw like 0.85 just to rule out the issue is not related to timing optizations done for recent fws.

        February 12, 2021 at 9:17 PM #45222
        xostia
        Participant

          It hapens the same to mine but purple artifacts are bigger… specially with big contrast images. They move from left to right… many purple pixels moving.

          https://www.dropbox.com/sh/1r2clrypgzaeeyj/AACJ_dPcTahioi3fzh0KhQxEa?dl=0

          There is no difference with Composite, VGA or Euro-AV input…

          ¿Any idea? …

          February 17, 2021 at 4:50 PM #45358
          marqs
          Participant

            Does the latter also occur with multiple/all AV inputs but not on test pattern? That’d indicate there’s a bad solder joint on some FPGA / video ADC pins. Are you still covered by warranty?

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