I purchased a 60 inch 3D Smart TV model 60lb7100 in December 2014. It started having problems right away with the screen going black but sound staying on the store. Replaced it with the same model in January 2015. This TV does the same thing. LG will not own up to putting out defective products but I know 2 other people with LG TV's having this problem. They have sent a repair service out and they changed the motherboard on it November 6,2015 and on November 8,2015 my TV lost picture. This is a lot of money to put out for a TV that doesn't work properly!