So I got a spare super nintendo today from the salvation army and immediately tested it out to see if it worked. Sure enough, it boots up just fine, but something was definitely off. Switching back my original snes It hit me. The other one's picture was noticeably more blurry.

I opened both up and the actual insides seem to be different on each. Mainly, one motherboard is labeled 1991, and the other is labeled 1995. The later, being the one that has worse picture. Both were run on the exact same tv with the same S-video cord & power supply.

Can anyone explain this?

Do certain models of the original SNES just not run well in S-video or is there another issue completely here?