I have a super Nintendo that works fine on every TV except the one I actually want to use it on, the screen jumps up and down and wont stop, I have tried adjusting everything, different channels and I also tried hooking it up every way possible. it is a very old zenith TV with just those 4 screws in the back, I have an RF modulator connected to it, and all the following things work fine on it: Atari 2600, nes, sega genesis, n64, and a dvd player.
Okay, what I would try is hooking up the snes using the n64 cable. right next to the rf slot in the back of the super nintendo is a slot thats the same video output as the n64 you can plug in the rca cables from it and see if they work
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I see you are going back to the 90's with your Super Nintendo. Firstly I do not know how you can "put the snes on chan 3". If I am correct, all super nintendo cables to the TV are RV coloured ones. therefore once it is plugged into the TV, you will ant the A/V channel? which usually has a separate button.
Secondly if what you say that you get a flash/glimpse of the game, then check the system of your TV. Is it PAL (Europe, Aus, NZ, etc) or NTSC (U.S.) Hopefully you can change the TV settings to match your game console!
Make sure everything's connected in the correct sockets. Turn the SNES on, change to one of the Analogue channels (one of the channels which you control with the TV remote) and start scanning for a signal. The RF cable has to be connected to the analogue port (where a TV aerial would plug in to get analogue channels) and the SNES needs to be switched on.
The alternative is to get a SCART-compatible cable that works with a Gamecube or an N64 and use it with the SNES, as Nintendo had the foresight to add an EXT port which'll let you play the SNES on an AV channel.
Actually your problem "IS" the 3rd party NES/SNES/Genesis AC adapter, which is notoriously unreliable, and many batches defective, bad ohm rating, creating a 60 cycle hum and/or noise bars that roll down your screen. The solution is to always insist on genuine Nintendo parts. I know, I know, but seriously, you'll save yourself a lot of headaches.
Yeah, they cost a little more, but it's worth it. And those cheap after market adapters have over time damaged more NES & SNES circuitry than you can shake a stick at.
Google Genuine SNES AC DC / DC Power Supply Adapter
It sounds like a scanning issue...Older TV's were setup to adjust the image to the screen. Since the new age is all digital, they kind of left out that feature because it only happened in very old analog systems.
Sorry but to my knowledge there are no converters or anything that I know of that will fix this issue. I haven't tried any of my old systems on newer lcd's so I haven't been in the market to look.