My LG 42LB5D LCD TV can't be turn off unless I unplug it from the wall, its stuck on HDMI 2, I can't change any setting. I can't use the remote because it stopped working last year,( must be the IR sensor) I got used to it by just using manual TV bottons...but now I am stuck !!!
My problem turned out to be a mother board that operates the IR remote sensor & the LG recommended repairman's estimate was over $500.00 with the part cost of $378.10. I spoke twice to LG's customer service and since the TV was over 1 year since purchased,(however not even 2) they offered nothing. One can now see why Best Buy sells their separate insurance policys, because over 1 year from the manufacturer there is no responsibility by them unless the failures reach gigantic proportions like they had in 1997 & 2003/2004. Buyer Beware
It sounds like you have faulty logic in your main board. The remote issue could also be related because the main board controls the processing from the IR sensor which is more likely because IR sensors rarely fail.
Replace the main board to fix the TV.
The main board part number depends on the model code of your TV. There are a few different ones for the model you listed and the list price range from $209.68-$297.19.
The model code is very important because if you get a board even though it is for the same model above, it will not be compatible with the TV.
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Inspect where the dark streaks are on the television. If the streaks occur at the same place on the top and bottom of the screen, they are due to the formatting of a movie or television show you are watching. This is normal. Also, if the streaks appear on the left and right of the screen, they are due to the show being filmed in full-screen instead of wide-screen. This also is normal.
Change the input setting so you are viewing the contents of a different device. If the dark streaks are gone, you know they are due to the device connected to it. However, if the dark streaks remains no matter what input the TV is connected to, the problem lies with the television.
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I apreciate your answer, I will try to see if I can find a main board online....just hope its not too expensive....
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