I know this might sound stupid but try changing the channel or changing the aux / cable / tv button... I had to put my phillips 50" in the shop for the same problem ..but I had it for 3 yrs .they said it was the power supply and will cost 1k to get the power back and may cost evne more if one of the boards went out (video i guess?) so make sure u get the extended warentee u will need it .Its only a matter of time ... good luck quickdrj
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