This summer I finally bought a SFC 1-Chip to play the games from my childhood.
Last week I bought a OSSC to connect it to a Flatscreen and it looks good, but yesterday I noticed some video noise
and can't stop thinking about it's there.

describe it like the background are moving.
Anyone who understands what I mean?

Is there any cables, powersupplies or I should buy to get rid of this?