Super Famicom Audio/Video Issues

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  • #39514
    ariyasu
    Participant

    Hello, I am using a Super Famicom with a RGB Scart cable from retrogamingcables.co.uk
    I have it hooked up to the AV1 Scart socket on the OSSC. The OSSC is running firmware 0.86a. When
    I play games and there is a dark scene, I see vertical bars across the entire screen, They are present
    in every scene but less noticible unless it’s black/dark.

    The second issue I have audio is always buzzing, humming and clicking, at all times in all games,
    please check the first video for an example. I have tested the SFC connected directly to a SDTV and
    it plays great with no audio issues and a clean image (see second video).

    Can anyone help or offer some suggestions. I am running out of ideas.

    OSSC SFC Audio/Video Issues Video

    SFC Direct Connection to SDTV, No Issues Video

    Scart
    Lines on dark scene 1
    Lines on dark scene 2

    #39517
    eatnumber1
    Participant

    Looks like jailbars
    https://shmups.system11.org/viewtopic.php?f=6&t=62631

    Also have a look through the google results for “SNES jailbars” to get more info.

    #53170
    ariyasu
    Participant

    Hello all again and sorry to bump an old post but I fixed the issue today and thought I would share the solution.

    First I did a full system recap and the problem was still there.
    Then I added 10uf decoupling capacitors to C90 to C95 as suggested in the link eatnumber1 posted above. This also did not fix the issue.

    This weekend was a bank holiday so I decided to mess around with it again and see If i could get it going. A user on discord suggested I try
    a different power supply, so I tried a Sega Mega Drive power brick, and the ugly vertical lines I had became ugly diagonal lines. This gave
    me something new to google for and I found this post by FirebrandX
    https://shmups.system11.org/viewtopic.php?f=6&t=43689&p=1312908&hilit=snes+apu+subcarrier#p1312908

    My Super Famicom had a diffrent board version than the one listed in the post. Mine is SNS-CPU-RGB-01 instead of APU-01,
    but I figured I would try it anyway. After lifting the leg and testing the image is crystal clear 🙂 so I am very happy
    and now I am off to play though Zelda.

    TL:DR Lift leg 3 of PPU-2 to fix awful RGB interferance on SNS-CPU-RGB-01 and APU-01 boards.

    View post on imgur.com

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