Random noise in image, tried nearly everything, have no idea how to proceed.

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  • #37768
    nrq
    Participant

    Hello,

    there’s some random noise in my image I can’t get rid of. Weird thing is, I don’t remember it being there in the beginning, I think I just noticed it a month or two ago when I got a new TV. Problem is, it’s not the TV, I can capture the noise just fine, as you can see in this video:

    Title screen
    Link’s house

    It’s especially apparent on the title screen and in Link’s house, but it’s there all the time in all games and in all modes.

    My setup is as follows:

    * PAL 1chip SNES
    Mods:
    – SuperCIC (from Videogameperfection)
    – Dejitter Mod (from Videogameperfection)
    – borti’s RGB bypass
    * PAL “2chip” (?) SNES
    Mods:
    – regular PPU1/2 50/60 Hz switch
    – lockout chip pin4 disabled
    * OSSC (from Videogameperfection)
    – Line5x
    – 256×240 optimized
    – 1920×1080 resolution

    I’m getting the same noise with two different SNESs, three different RGB cables, one with Luma Sync, two CSync RGB cables. I already tried three different power supplies for the SNES and another power supply for the OSSC. I tried all different combinations of power outlets in this room and tried to have the RGB cable as far away from the power supply and cable as possible. I put on ferrite chokes on the cables, which showed no noticeable difference. The noise was there before I modded the SNES with the RGB bypass, infact it was the reason to put in the bypass in the first place.

    I’ve ordered a 1chip recap kit from console5, but that’ll take a while to arrive and I’m not convinced it will help with the noise problem, since it also shows on my other SNES.

    I’m at the end of my rope. Does anyone have an idea how to approach fixing that issue?

    • This topic was modified 4 months, 2 weeks ago by nrq.
    • This topic was modified 4 months, 2 weeks ago by nrq. Reason: Added time stamped links
    #37775
    BuckoA51
    Keymaster

    What firmware on your OSSC?

    #37778
    nrq
    Participant

    It’s on fw. 0.85a.

    #37782
    paulb_nl
    Participant

    With all modes do you mean Line3x and Line4x also have this issue?

    I already tried three different power supplies for the SNES

    Any of them an original Nintendo power supply?

    #37784
    nrq
    Participant

    Line4x has the same issue, I haven’t tried the others yet.

    Yes, all three power supplies are original, genuine Nintendo power supplies. I have a bunch of SNESs around that came with different purchases.

    #37785
    BuckoA51
    Keymaster

    Try a different display and if the problem persists, RMA the unit.

    #37799
    nrq
    Participant

    Try a different display and if the problem persists, RMA the unit.

    Sooooooo. About that. m(

    Yepp. Different room, using my computer monitor everything is perfectly fine. No noise whatsoever. Super crisp picture. Couldn’t be happier. Captured everything here:

    I assume there’s something generating that noise in the power line in the room with the TV. I’ll take everything off so that only the TV and the SNES with OSSC is connected and put everything back online piece by piece to figure out where the culprit is.

    Thanks a lot for the help! As obvious as it is in hindsight, I wouldn’t have figured that out alone.

    EDIT: turns out the culprit was the USB-C power supply for the Raspberry Pi 4 I got with the new TV for 4K videos. Problem solved.

    • This reply was modified 4 months, 2 weeks ago by nrq.
    • This reply was modified 4 months, 2 weeks ago by nrq.
    #37827
    BuckoA51
    Keymaster

    Very frustrating. I had huge issues with powerline noise in the old house in UK and went through all kinds of things to prevent it. Eventually I had to use a pure sine wave UPS and a replacement linear PSU for sensitive consoles.

    I’m surprised that turned out to be the culprit here though, as usually that’s wavy noise patterns, or at least it was in my experience.

    #37917
    RTStu
    Participant

    Glad you found a solution. I came into this thread expecting a little action on pixel edge boundaries and was shocked by the amount of random crawl.

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