Is this modification possible?

This snes mod might work...

 

I think that cutting/disabling specific wires would cause that but I didn't experiment with that on SNES.I did something like that on my old laptop and graphics were all blackened.

 

If you're asking this you aren't ready to be "experimenting" with hardware. Go get yourself an EE degree and you'll have oodles of fun that doesn't simply kill hardware for the sake of "experimentation".

And there are plenty of documents on the internet that detail how the SNES works but short of some good education you won't be able to understand them enough to put them into practice. Simply cutting a trace won't disable a background layer like it does in an emulator.

 

Agreed - learn basic electronics, then the basics of computing from an electronic perspective, maybe some relevant coding and THEN tackle it. Don't have a basic idea without any clue how to do it, then expect someone else to do all the work for you.

Why the hell you'd want to do this anyway, I don't know.

 

I only became curious after watching some interesting console tweaking and glitching on YouTube, though none where they specifically disable video channels. That's why I wanted to know if it is physically possible before thinking about going ahead. It might be worth doing like many console tweaks.

 

You can do "circuit bending" but it won't produce results that you want, not by a long shot.

I've been at this stuff for years and I have an idea of how to go about what you want but I'm not sure I could accomplish it without far more time studying and building some custom hardware/software to disable layers. Admittedly I do think that your idea is pretty cool and would be fun to play with but I'm not sure it'd be an afternoon project by any means.

 

To be honest, I'm getting to my old man phase where I'm thinking that unless you know your mod is 100% going to either not affect the lifespan / usefulness of a console (or expand it) you should probably focus on getting what you want out of emulation. Sadly these consoles aren't going to be around forever and there's a finite amount of them, so effort should start to be placed on preservation, even for the most popular systems. No point killing or harming one if the most popular emulators can do it with 2 mouse clicks.