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Commonly for LCD tv's if the screen went out,,the problem will be the CATHODE RAY TUBE,it is costly to buy.if you want you can buy it,,or it may be the D-board problem will be also,,, but it is unusual,so check the tube.
Most likely the lower y-buffer board which is mounted to the left of the panel in the back of the TV is bad. I believe you can get LG equivalents for these boards. There should be part numbers on the board itself..
Hi there! If picture is smaller top to bottom with blank section on top and bottom then check your aspect ratio settings. If blank at the bottom only the Bottom Y-Drive board may be faulty. If blank at the top The Top Y-Drive may be faulty. If blank on the Left (TOP TO Bottom) then the Right X-Drive Board and on the Right, the Left X-Drive Board. May also be bad connections on the cables or flexible ribbon cables. Best Wishes and Good Luck, JUS004
intermittent loss of picture on either bottom or top half of screen is specific to y buffer boards located on left side of screen going from top to bottom when looking at back of tv. the y lower buffer would be the board to replace to resolve the loss of bottom half of picture. if the top half also is going out intermittently could tied to upper buffer as well but just a note the y main board to right of these buffers drives those two boards so in some cases could also be part of the problem. if only bottom half is affected i would recommend replacing lower buffer only
When only a half screen is produced, it is usually a upper or lower buffer board, if the top half is blank then it is the upper buffer, and of course if it's the bottom half then it's the bottom buffer board