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I have the same issue as soon as i turn it on, regardless of what is connected, even in the setup screens
I have a cable box and streamer connected to the tv through a small sony home theater amp.
I forgot to mention i have the tv since december 2008 it's been working flawlessly since then
Well i figured out one of the leds could be burning, or so, arrived to you guys after reading this great post: http://www.justanswer.com/tv-repair/6jy9g-hello-i-samsung-67a750-just-started-going.html
I just didn't know which led defaults when the set becomes yellowish...
Thank you for your help!
I did not understand what you meant in "trip the lamp door switch (tape it down),"
Also, how do i test the leds's lighting, do i have to turn on the tv or should i use a 9v battery with each led?