Lcd tv's screens are actually made up with 2 parts a left and a right side each having its own video feed with generates half of the image each and sincs them which to the viewer appears as 1 full screen. if your screen is missing half of the image and it is exactly occurring inn the middle of the screen them the video signal probably isn't making it to that half of the lcd. either the video board is falling or the ribbon connector from it to the lcd has failed or possibly the connection where it is attached to the lcd (which saddle isn't reparable and would require replacing the lcd panel) the first 2 mentioned are an easer/cheaper fix . you can usually check the lcd connection buy removing the back gaining access to the connectors and see if the image appears on the screen while applying pressure along point where the connection goes into the lcd. if it does then the connection had come loose and as far as i know theres no way to reattach it.
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