SNES Mini RGB bypass 4.1 – Sync issues

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  • September 19, 2022 at 10:19 AM #54947
    Seroczynski
    Participant

      Hi,

      I’ve installed the RGB bypass 4.1 board in my SNES Mini, but I’m having some video issues. The image seems to have a purple tint and is unstable. I’ve followed Borti’s installation instructions and connected CSYNC as discribed on RetroRGB. This is exactly the same installation as I have done successfully on a SFC Jr. before.

      I’ve noticed that there is continuity between two ground pins shown in the picture below. However, there is no apparent bridge like in the picture. Could this be a problem?
      snes-mini-ground-pins

      September 20, 2022 at 11:42 AM #54967
      TheCorfiot
      Participant

        The Bridge has been seen on a few consoles, its a factory manufacturing issue however not a big deal as both those pins are ground anyway.
        Advise removal before fitting the bypass board.

        Before fitting the board to a junior you need clop the pins on 3 capacitors, the 2 in your picture and one further right.
        Also ensure you insulate the underside of the board with tape.

        Ensure you have fitted 1k2 resistors to the rgb pads as required and you can replace c11 with a 220nF capacitor to reducer ghosting.

        I would reflow your rgb connections on the pcb socket header, remove existing solder first, you don’t need much but you do need to keep each pin heated for a good 6 or seven seconds to ensure a smooth even solder joint on all the parts.

        Csync should be taken from pin 18 of the video encoder.

        Finally ensure you have correctly set the jumpers for attenuation or csync buffering.

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