The picture area has an opaque dark area at the top of it measuring 2" at left side going to about 3.5" at the right side. Could this be caused by the close proimity of the center surround sound speaker?
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This tv have a problems with a board that call T-CON decodering board.This T-CON decodering board sit at the bottom in the middle of the LCD screen panel.This T-CON decodering board,decodering the tv incomming broadcasting tv signal before it go into the tv LCD screen panel to produce pictures.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-CON decodering board for the replacement.
you could be on the right track get some freeze spray and go around all the parts to see if you can make it act up, same with heatgun or hair dryer when first turned on heat one area at a time to narrow your problem down
The dark side of the screen causes of the lamp alignment or prism glass alignment. This is critical you have to consult your LG technician to do this. But if you have any background o repair consult the service manual. Please careful not to touch the prism quarts so that you maintained the clarity of picture and brightness on the screen.