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Are these lines on both side of the screen or what location are they in? They can be caused by watching 4:3 television with the black bars on both sides. Watching 16:9 full screen HD wont cause issues with that. If only on the sides there is not much you can do except put a pure white screen on the TV and leave that on for at least 6 hours. This will age the panel a little but in theroy wil even the pixel burn you have to make the lines less noticable. Please take a few moments to rate my answer. Thank you
sounds like inverter board. What it sounds like is happing is your LCD is working ut the backligkt board that allows you to see is kicking off. (as you still have sound) Which could be the (most likely) inverter board, or the power supply board. You can take apart and check for voltage at your power supply. The power supply has a pigtail with large white wires and a connector. Power up with the center back cover off and check your voltage at the white connector on the power supply before and after the screen gos out. If there is no large voltage loss it is your inverter board.
You can used boards on e-bay or www.rns-systems.com
on the rermote control look for the button with a tv screen outline, two lines going down with arrows pointing to the edges they are closest too. when youve pressed that a menu pops up and select full mode. hope this helps
it sounds like your IR board is going out, its easy to replace and is inexpensive usually about 10.00 plus tax and shipping, and very easy to install, its one of the few parts you can buy for these models outside of the 479.00 dollar control box.