In your YouTube video at about the 6:45 minute mark you note a bar in the video that runs from top to bottom in the center of the screen.
As I have been researching how-to videos involving repair of my SNES I've been all over YouTube for advice. I ran across a guy that improved (increased) the power supply filtering which either reduced, or eliminated the noise bar (assuming yours is for the same reason).
I had a set that wouldn't boot a game so the noise bar wasn't my problem- I didn't watch the whole video. Nor, could I tell you how to find it. But, it might be of help to you if you wanted to go searching for it.
Hope that helps you.
Brian
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