I just got a used 7800 on ebay. I have it hooked up to my 21st century flat screen toshiba TV since that's the only TV I have.
I've got an RF cable going to a an RF to coax converter that I got on ebay for about $5. And that's of course plugged into my tv's antenna input. Not like it should matter to much, but the RF to coax converter advertised that it was for use with 7800s, so I'd imagine many other folks bought this item and it worked for them.
The console powers on (red LED lights up) and the display kinda does stuff but it certainly doesn't look game-like. For combat I just get a green screen that does nothing, for pitfall I get rolling brown and black bars, and for Food Fight, a 7800 game, I get a white screen. No game sounds can be heard and the display doesn't change if I press buttons on the joystick/console to start a game.
I had heard before that the 2600 hardware inside a 7800 can break while the 7800 hardware still works, so it actually makes me feel better that my 7800 game is doing essentially the same thing in terms of not displaying correctly.
i checked my TV's input options in the TV menus but did not see any particular settings that I could change for the coax input.
Any ideas on what is the matter? Is it probably weak signal output by the 7800 that can't be interpreted correctly by my TV? If that's the case, I guess my options might be to have an AV mod done to the system, or buy a VCR to use as a passthrough for the AV signal...
If weak video signal does not seem to be consistent with what my symptoms are, are there any simple ways I can check whether my 7800 might be damaged in some regard?
Thanks for your help, I have a ton of games from my childhood that haven't been played in over 15 years!
Edited by sirlynxalot, Mon Mar 20, 2017 7:01 PM.