Check to see if any cables are damaged or burnt.
Check to see if there is a disconnected or loose cable connection.
Check to see if the cables are connected according to the connection diagram.
Check the power input to the Main Board.THERE ARE TWO TYPES OF CIRCUIT BOARDS TO THESE TVs
TYPE-A [NO POWER]
BOARDS LOCATIONS
TYPE-B [NO POWER]
CLICK ON THE PICTURES TO ZOOM IN