Is the line on the picture or just next to it?
"overscan" refers to the part of a picture that is offscreen, a TV pic is slightly larger
than the TV (idealy).
In other words your "red line" might have always been there, but for some reason your set
picture has shrunk, reveling the line.
I had a red line on the side of my set when I first got it, but it didnt last long, my pic did a few changes and it was gone.
I would take it to a tech, they can either fix it or adjust the size of your sets pic slightly so that it disapears.
Unless its a bad panel, no way to fix that.
AFTER WATCHING a friends Sharp VCR literally fall apart in less than a year I
dont buy the brand, or reccomend it, usually, but this was awhile ago, dont know
the quality of stuff they are making now, I DO KNOW THEIR led SETS LOOK GREAT.