Hello , my name is Jack Perhaps I can help you with this problem but first i would have a few questions ;
Is this tv connected to a cable box/converter,satellite receiver,digital converter etc ?Or directly to antenna/cable from the wall outlet ?Do you have other equipment like a dvd,bluray,games etc. connected to this tv ?If so , did you notice this problem no matter what equipment is playing on tv ?
Can you see the tv`s own menu for example ?
O.k and you are saying blank or off ?
What i mean is , is it just blank with some background light or completely dark like when the tv is off ?