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I know on some models, specifically the Vizio 42s with the LG panel (VP42, P42HD, etc), I would see sparkles on the high-hour sets. I would tweak them out with the pots as best as I could, but they didn't always go away completely.
I guess I am saying, with your set, it might have a lot of hours on it, and that's as good as it's going to get.
Also, that laying-flat thing is an old wives tale in my opinion. When I worked at the recycler, ALL of our TVs were shipped to us flat, in stacks, on pallets. You've seen how they work, I don't see how anything could be damaged by laying them down.
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