Snes ghosting

Viewing 9 posts - 16 through 24 (of 24 total)
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  • #16406
    eric90000
    Participant

    Oh really? The CPU 155 pin lift mod?

    #16407
    ErebusMaligan
    Participant

    Just wanted to second this. I came across Borti’s info in the shumps post a while back when I was doing some searching on this issue for myself. I performed the pin 155 fix on my snes, and it completely fixed the problem for me. It is definitely a delicate procedure though, and I’m surprised I didn’t break the pin myself, as I am not experienced with smd soldering/desoldering.

    Some displays definitely show the ghosting more than others. In some cases the lpf on the game 1 mode on the framemesiter would hide it pretty well, but that obviously also blurs everything slightly, so it’s a tradeoff.

    I’d also note that the severity of the ghosting seems to vary from console to console. I used to do RGB mods for a while, and out of maybe 8 or 10 that I did, the ghosting ranged from more severe than on my console, to almost invisible, without performing any fix. I know almost nothing about electronics, so I can’t really explain why that is.

    #16410
    slickrasta
    Participant

    Is someone able to post pictures of what the completed pin 155 fix by Borti looks like? I’ll be modding my SNES Mini soon so that would be helpful.

    #16415
    eric90000
    Participant

    Here is Borti’s picture of his installation. He kept it very small and neat. You don’t have to use that spot for Vcc though, just use a multimeter to find a spot that has continuity with the 5v output leg on the 7805.

    https://circuit-board.de/forum/index.php/Attachment/65363-scpun155-vorwiderstand-jpg/

    #16435
    megari
    Participant

    Is this ghosting issue present both in PAL and NTSC 1-CHIP consoles? I tried looking for ghosting on my PAL 1-CHIP unit and noticed only something very, very faint (I don’t even know if it can be called ghosting, rather than minor brightness variation next to sprites) that I would never see unless I was specifically looking for it while less than 2 feet from the TV.

    #16441
    eric90000
    Participant

    I can only speak firsthand for my own console (NTSC SNES mini w/ Voultars THS7374 bypass), but I have heard others report the same ghosting issue on PAL 1-CHIP consoles too. The amount of ghosting even also varies between different consoles of the same type. I can see it pretty bad on my setup, as it’s outputted from the OSSC in 1080p to a 55″ 4K TV. I’d imagine bigger screens make it look worse. I tested it on a tiny RGB CRT though and I can still see it.

    #16444
    noko_bombette
    Participant

    What I reported above is using my PAL console.

    #16459
    Harrumph
    Participant

    The SNES mini has 5V in different places (the via used by Borti in the link above does not exist). See this thread: https://shmups.system11.org/viewtopic.php?f=6&t=60733&p=1273812#p1273812

    #16647
    eric90000
    Participant

    Voultar has made an exciting discovery regarding the 1-CHIP ghosting/vertical bar issue. It seems to be as simple as replacing an SMD capacitor. Lifting pin 155 on the CPU looks to be totally avoidable in terms of fixing this issue:

    https://shmups.system11.org/viewtopic.php?f=6&t=61072&start=90

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