N64 PAL picture shaky until OSSC restart

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  • #20506
    shephard
    Participant

    I encountered a strange problem that happens quite often, but not everytime. When I boot up a PAL game with my N64 the image is very shaky, it seems as the picture is like a wave. This can especially be observed at the edge of the picture, I made a video of this which can be found here.

    When this happens sometimes the screen goes black and comes back after a second (red LED does not flash, so sync is not completely gone). The issue can be resolved when I turn the OSSC off and on again, then the picture is calm and without issues. I’ve never encountered this with a NTSC game. What could the reason be?

    I’m running a french RGB-modded N64. Until recently I used CSYNC from the S-RGB A chip by connecting it with the Multi AV out through a 470 Ohm resistor for syncing. For testing purposes I then went with Luma-Sync because of the proper 75 Ohm termination, but the issue happens with both kinds of syncing. I’ve already played with the H-PLL Pre- and Post-Coast settings, but I couldn’t resolve the issue. Does anyone have an idea?

    #20509
    BuckoA51
    Keymaster

    How long ago was your console modded and with which amp?

    #20514
    shephard
    Participant

    I bought the console already RGB-modded about three years ago. It is the french model where the “offical” RGB-circuitry is already on the PCB and one has to solder just the missing SMD components to restore RGB functionality. I’ve only done the sync mods by myself.

    #20544
    BuckoA51
    Keymaster

    Ah ok, I’ve not had any experience with those particular models unfortunately.

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