Well, the bloke is coming at 11 central time, so I wanted to be armed with a tad more opinion.
I will have another look at your link, but we'd both tried the full range of all the picture controls including back-lighting, and it made not a jot of difference to the white patches.
The tekkie that came from Sears knows me well. Fussy? Moi? He gave up, and finally conceded that after $4360 spent on light engines, enough was enough. I expect he went a bit furry round the edges when he saw my call for the new set. Still, hopefully no more Sears. They are not even capable of answering a phone, let alone supporting hi-tec gear. 'They have lost contact with the people' [
Sic] is how one national report described that once great retailing institution.
When the daft

came to deliver my new Samsung, I was getting the box for the Sony down from the attic. It was huge, and every tiniest piece of wrapping was there.
He frowned and said 'They'll have to do the packing." and slid the telly on its back, along the concrete into the box. Not a fingermark did I put on it in all the time I had it. Still, I guess they were going to bin it - though it really was still quite a good picture.