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You should definitely return it. It is most likely due to backlight malfunction and or backlight invereter malfunction. Either ways you should return it and demand for a replacement if its under warranty.
When the TV is on, if you look at the screen and can see dark images, then you will need to replace both the inverters.The inverters drive/power the back light inside the LCD to show the images.You may have to try and different channels and or inputs to truly see if you can see dark images while the TV is on.If you are hearing audio from a channel or an input then you should be able to see the dark images if just the inverters are bad.
If the screen is dead black without any dark images, then typically your LCD screen/module is bad.
If the TV powers up (power supply is good), you have audio and the remote will work with the TV (the main board is good), the only parts left is the inverters or the LCD screen/module.
I can get you LG part numbers if you need them.
Called ghost lines or banding. I researched on toshiba thread LCD screen bad. I have same problem purchased HL196 4/07 problem appeared 1 year and 9 months ago no extended warranty. If still under warranty call toshiba. LCD screen more expensive then orginal price of TV. Should file class action lawsuit for selling defective screens. Lot of people having same problem. goforth2953
Lol, I'm not a Guru but I am a Wiz, so I can help. Usually, those lines you see, are from the burning of a channel. It's when the plasma gases inside of the screen stick to the screen and don't come off, it's permanent. Unless your T.V. type has on the menu a Screen Burn Protection like a 50 inch Samsung I have. The only reason it burns is because bright white lines in front of a dark background. Usually HD channels have small icons so they don't stick in the screen, so unless it's under warranty, you can take it back, but if not, then sorry. You can't do anything with no warranty or receipt.