Snes ghosting

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  • October 25, 2017 at 9:41 PM #16406
    eric90000
    Participant

      Oh really? The CPU 155 pin lift mod?

      October 25, 2017 at 10:45 PM #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.

        October 26, 2017 at 6:13 AM #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.

          October 26, 2017 at 10:46 AM #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/

            October 26, 2017 at 4:35 PM #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.

              October 26, 2017 at 7:25 PM #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.

                October 26, 2017 at 8:27 PM #16444
                noko_bombette
                Participant

                  What I reported above is using my PAL console.

                  October 27, 2017 at 9:10 AM #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

                    November 1, 2017 at 2:18 AM #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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