Red Channel is not working (always at maximum)

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  • February 17, 2017 at 1:28 PM #11310
    thestr4ng3r
    Participant

      I just finished building my OSSC and flashing the initial firmware and it does work except for the red channel.
      It seems like red is always at the maximum value. This happens with both the SCART and the VGA input.

      When I lightly touch the PCB between U2 and U1 with my finger, the image partially changes, but the areas that changed look like red is 0.

      Here are some images: https://goo.gl/photos/KGzv3Y12qqrz7LURA

      Any ideas what I should test?

      February 18, 2017 at 2:34 AM #11355
      marqs
      Participant

        Assuming that test pattern displays correctly, you either have some high bit(s) of R-channel bus between TVP7002 and FPGA floating, one of the TVP7002 P/G pins near R_IN* disconnected, or damaged TVP7002.

        February 18, 2017 at 2:39 PM #11368
        thestr4ng3r
        Participant

          Thanks for the tips!
          I went over all pins of the TVP7002 with the soldering iron again and that fixed it.

          The image quality is just stunning with the Mega Drive’s RGB output. Thanks a lot for developing the OSSC!

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