I got a trouble with my Samsung UE55KU6450 Smart TV (4 years old):
When I turn on TV, screen works fine in the begining, but vertical shadow stripe appears a few later.
I note the same area at the rear of the TV is a little hot, as the bottom front.
I've tried auto image testing and trouble remains in all tests.
You will find the same issue been frequently reported in Google for different series of Samsung TVs, but not given a technical reason explaining what's up, nor a solution. Is it a LED stripe problem? A electrical issue? Could it be due to heat dissipation or panel pressure adjustment issues?
There may be a controller or motherboard just at the same area than vertical shadow because around there at the rear cover input AC is located.
So, is it possible that overheat at the electrical board is producing malfunction on the LEDS around this area?
LED stripes are not vertical so that overheat at the board area could explain the vertical shadow
Did you ever get an answer to this? I’ve had my TV for about 25 months and have started to see the same issue (exactly the same position too)
Smoke came out because something burned inside when I turned on the TV a few months ago. I opened the TV and found a led bar burned.
I couldn't believe it: all the components were perfect, except the led bar, the cheaper one. Poor product quality, that's all.