Sorry if this has been covered already, but I couldn't find the exact same description of the problem, so I'm not sure if it's normal or can be corrected. Just got my second 55HX850 after returning the first for a bad pixel plus the occasional 1/4" light strip across the bottom edge of the picture. The second one which I have now also often exhibits this 1/8" to 1/4" high light strip (glow, band?) across the bottom edge. It's almost like it's part of the video itself, but seems more like a backlighting artifact. It's only very slightly brighter than the part of the scene above it and is probably not noticeable unless you're looking for it, and it doesn't seem to occur on the side or top edges. It's more frequent at the bottom right, maybe 15" across, but sometimes extends almost all the way across the screen. And it's directly at the bottom, against the black edge. Backlighting is 4 and LED Dynamic is set to Auto. It doesn't seem like the backlighting setting has any effect on this. Maybe it's a video processing artifact where the processing gets confused by the bottom edge?
You can sort of see it in the attached picture, basically across the bottom middle 1/3 of the screen shot. It looks like a glow coming up from the black edge. With Nascar on Speed channel today, it's can be really obvious across the entire bottom edge when the gray track fills up the bottom of the screen. But it doesn't seem correlated with extremely bright scenes.
I was watching a Samsung 55F7050 in Costco yesterday, and it didn't have exactly the same problem but the bottom edge seemed to jump around on that TV, and in general wasn't any better. So I don't know if there's just a bottom edge problem with edge lit panels, or if it's something not quite right with the panel, or if the video processing has a problem
Otherwise the image looks great so I'm inclined to keep it, but still wonder if this is a "feature" of this HX850.
Thanks for the help.