MVS – sync and test pattern but no output

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  • November 1, 2025 at 9:18 PM #67603
    chumley
    Participant

      Hi, I’m new to all of this but I have a MVS Neo Geo, RGB via scart, I get picture if I directly connect to a TV (1080p Sony led) but I cannot get anything via the OSSC (apart from test pattern), on either that TV or any other TV or monitor I have (tried 4k Sony OLED, 4k OLED PC monitor, LED PC monitor, Panasonic Plasma).

      I get sync : AV1_RGBS 264-p 15.62k.Hz 59.19Hz but after clicking the button to activate it I get black screen / no signal.

      Can someone please help?

      • This topic was modified 1 day, 10 hours ago by chumley.
      • This topic was modified 1 day, 10 hours ago by chumley.
      November 2, 2025 at 10:05 AM #67610
      BuckoA51
      Keymaster

        Are you using an RGB cable? You must use a fully wired RGB SCART cable (or component video cable) with the OSSC, you cannot use composite video without a transcoder.

        November 2, 2025 at 10:12 AM #67611
        chumley
        Participant

          Yes full RGB from ths7374 cmvs RGB board with a known working, good quality cable

           

          • This reply was modified 16 hours, 15 minutes ago by chumley.
          November 2, 2025 at 10:12 AM #67612
          chumley
          Participant

            Yes full RGB from ths7374 cmvs RGB board with a known working, good quality cable

             

            November 2, 2025 at 2:03 PM #67613
            marqs
            Participant

              Have you tried these settings? From what I remember, Panasonic plasmas at least do not tolerate 2*264 = 528 line signals by default. 0.xx firmwares had a hack to make them working with these, but was left out in the transition to 1.xx series. It’s due to make a comeback soon, though. 59.19Hz is another thing that some TVs do not handle.

              November 2, 2025 at 2:26 PM #67614
              chumley
              Participant

                **Sorry double post**

                • This reply was modified 16 hours, 28 minutes ago by chumley.
                November 2, 2025 at 2:26 PM #67615
                chumley
                Participant

                  I have put these settings on, they didn’t work but it took longer for it to say no signal.
                  The main TV I’m using is a Sony KD-55AG9 (OLED)

                  • This reply was modified 17 hours, 10 minutes ago by chumley.
                  • This reply was modified 16 hours, 28 minutes ago by chumley.
                  November 2, 2025 at 3:21 PM #67619
                  chumley
                  Participant

                    I upgraded from 1.11a to 1.12.
                    Imported firebrandx Neo Geo profile.

                    Altered H-PLL pre and post coast to 2 lines and it works!!!

                    • This reply was modified 16 hours, 20 minutes ago by chumley.
                    November 2, 2025 at 3:24 PM #67620
                    chumley
                    Participant

                      • This reply was modified 16 hours, 18 minutes ago by chumley.
                      November 2, 2025 at 3:40 PM #67624
                      lordformat
                      Participant

                        Thansk guys, for the settings, and i’m glad to see  run correctly  Thanks to Marqs and Matt for support.
                        ill make a a tiny link to this post  with the future manual of my cmvs

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