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Sounds like a main board that controls everything on the screen and then some.
Since a LCD do the flashlight test (what I call it) : darken the room as much as possible and with a flashlight and the set on look closely at the screen, see a very very faint image of the picture or not?
The Aspect ratio of the TV could be on the wrong setting for the image you are trying to view. Widescreen's standard ratio is 16:9 ensure the TV is not set to zoom, 4:3, or pan & scan in the picture menu of your TV.
If the picture looks normal except it's just missing the edges or looks squashed or looks like it is zoomed in from the normal image then aspect ratio is probably the cause.
Sounds like you need to try reseating the lvds cables on the t-con board.This board is located at the top of the set in the center.You will have to remove the metal shield covering the board.Then you will see to flat cables connected to the board,one for each side of the screen.carefully unlock the connectors and remove and replace the cables.If this does not work you will need a new t-con board.I'm not sure about this particular model but sometimes the t-con board is only available as part of the lcd panel assembly.Good luck!
IF the set is under warranty, you should return it.
Do this to see if your set is "sending" the image to the LCD panel.
1) What the set on take a bright flashlight and press it against the screen.
2) Look for the "image" moving around the edge of the flashlight.
3) If you see the "image" then the problem is in the inverter/CCLT or the power to it.
4) If you do not see the "image", you should look at the LCD controller(TCON) for the problem.