Samsung LE37R72B with strange fault

[hgg]

Hi,

I have a Samsung LE37R72B with a strange fault. 
The image on the screen has a dark shadow in the middle.
Its more apparent when the background behind the shadow is darker.



I've replaced a damaged capacitor on the power board but things did not got any better.
When you leave it on for a while to get hot, you can also see a couple of very faint vertical lines.



When I saw the black shadow I thought that it was some kind of problem with the LCD layers, so I disassembled
the TV completely and cleaned every diffuser sheet.  They were clean.  The problem did not change at all after that.

The vertical lines when hot might suggest the t-con board, but have you seen a t-con board fault create
black shadows like that???

Thanks.

[login]

looks like a panel fault and not repairable

[shakalnokturn]

How did it happen?
Any chance it has been handled wrong and the aluminium backing to the LCD is bent and pressing the panel?

[hgg]

Everything was straight and flat.
When I cleaned and put back all the sheets I expected the shadow to change a little bit
but it remained exactly the same.  The owner told me that the shadow was slightly different
a month ago.  More faint.