Dreamcast VGA via OSSC colour issue.

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  • February 14, 2021 at 4:52 PM #45279
    Dazzer10
    Participant

      * Dreamcast PAL, MODEL No.HKT-3030.
      * Dreamcast to VGA – Kaico Dreamcast VGA cable.
      * Connected to VGA input on OSSC, HDMI is direct from OSSC to TV.
      * TV – LG WebOS TV UJ630V – Software Version 05.80.65
      * OSSC sync info – AV3: RGBHV 525p 31.46kHz 59.94Hz

      Hi, wonder if anyone can help, please? new OSSC user here.

      I have tried running a Dreamcast VGA > OSSC > TV but seem to be missing a colour channel, possibly red?
      I have tried the Dreamcast with the VGA cable plugged directly into another TV that has a VGA input and it works fine.
      Are there settings I need to update first to get it to work or should the OSSC work out the box?
      Details above and in pictures.

      Thanks,
      Darren

      Image via OSSC

      Image via direct VGA to old TV

      February 16, 2021 at 3:33 PM #45327
      BuckoA51
      Keymaster

        Your OSSC is faulty, get in touch with us or whomever sold it to you.

        February 19, 2021 at 1:13 PM #45385
        Morpheus_79
        Participant

          It’s the same problem as described here:

          VGA red input lost

          Dreamcast – blue image

          VGA input seems to have lost red

          Dreamcast blue screen VGA

          Seems like some older(???) vga-boxes for the Dreamcast can do some damage on the A/D converter IC (TVP7002 = U1). The broken TVP7002 needs to be replaced in order to have a fully working OSSC again.

          Could you please tell us which vga-box/-cable you’ve used for connecting your Dreamcast to the OSSC? This information may be helpful in doing some research regarding this issue (since it seem to affect only a small group of Dreamcast owners and it’s not exactly clear yet, which combination of DC + cable/box could cause it and why).

          February 19, 2021 at 5:53 PM #45391
          Dazzer10
          Participant

            I am using the Kaico SEGA Dreamcast DC VGA High Definition Cable RCA Sound Adapter HD PAL/NTSC.

            link to where I purchased it from = https://www.amazon.co.uk/gp/product/B072QCSW6Q/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

            I now have a replacement OSSC, and it is working fine with this cable.

            February 20, 2021 at 10:20 PM #45400
            Chris1479
            Participant

              I would just like to offer my two cents to say that I am using the same VGA adaptor on the OSSC and have not experienced any problems.

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