Samsung UE49KU6400 shadow issue
I would appreciate any advice regarding faulty Samsung TV UE49KU6400UXXU. We have it for 2 years now and before few days dark vertical shadow started appearing on the screen. If TV is cold and you just turned it on you barely can see it, but if TV is on for about 5-10 min. the shadow becomes highly visible. Not sure if it is coincidence, but after shadow becomes visable TV's back at almost same place as shadow becomes warm. You will find several pictures attached with test photos in which the shadow is highly visible. Any ideas what may cause this issue? Quite strange as shadow is vertical. If it woud be horizontal I would guess it can be faulty baklight strip, but as it is vertical it would be strange that all backlights on all strips in one vertical line became faulty. I would guess that T-Con board became faulty, but not sure if such issue may relate on it. Already tried to remove all cables, picture tests, reseting the settings, but no success. Any suggestions, ideas are welcome.
Is this a good question?