I have a 50'' led samsung tv. When i watch videos online (streaming) i get this flicker on the screen, also when i scroll up and down on websites it flickers, only on the top half of screen, its a line that go across. I have spent days researching calling samsung, doing everything i can think of, played with tv settings, Video card settings. I did notice when i put resolution at or below 1280 the flicker goes to bottom half of screen.