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Black Screen come from three areas.
1- Power Supply Board
2- Inverter Board
3- Processing Board on the LCD.
Since the Power Supply Board was replace, it easy to troubleshoot where the problem. lies
If you cannot get the backlight, then its the inverter board.
If you can use a flash light on the TV screen and can barely see the images, then the problem is indeed the inverter board.
If you cannot see any images when using a flash light, then the problem comes from the LCD processing board.
Let me know if you have any success.
Help! My Plasma by Magnavox is putting black verticle lines on the right side of the screen - comes and goes - and I replaced the entire Direct TV-HD unit - wires, everything - and had TV company repair - and it still came back. The TV repair refuses to take TV back because it does not show up when they come. Although I videotaped it and showed them which has the date and time - they still refused to take it - and tried to get me to sign a paper saying it was working while they were there - which of course I refused to sign - so they left and nastily said they will not be back-find someone else. I still have the lines - and do not know what to do! Can anyone help?
Thin white dashes on top of screen is PERFECTLY NORMAL. It is nothing wrong with the TV, it is the broadcast. What you are seeing is the very bottom of the timecode running. It doesn't happen all of the time or all channels. It usually happens with old 4:3 commercials predating "Digital TV." This is mentioned in your Users Manual. You should be able to adjust the horizontal/vertical position in the menu settings.
I had the same problem with mine, LG techs came out to my place and upgraded the software and the problem went away.
I had mine for nearly a year when it started, supposedly is it quite common.
Anyway, dont worry too much about it as easily fixed. I have been very happy with my TV and have used it everyday for 16 months. Just want a higher resolution TV now.