ive got an old SNES I picked up at a garage sale that was in pretty bad shape. looked exposed to the elements, etc. after substantial cleaning I seemed to revive it, but once i put in super Mario world it had issues. every time mario goes through a turn he disappears! tried with 3 different copies of the game and each one did the same thing anytime mario hits the curve. here is a video http://www.youtube.com/watch?v=5NrmIffxvJc

based on other threads it looks like one of the main board chips could be bad, but most other ones i saw had consistent video weirdness while the game ran OK. does anyone have any suggestions? would re-flowing the solder on the chips help at all or is it beyond hope?