While watching a channel the picture suddenly froze then the "no signal" icon appeared. Attempted a rescan but no channels found. Have tried switching off at the plug several times and a factory reset, but the antenna symbol is now greyed out in the input window and the time is no longer displayed. All I get is "not programmed". To check the aerial cable I pulled it out of the TV's coaxial socket and plugged it into a smaller 10" LCD tv. Picture was perfect. TV is just over two years old. Is this a tuner failure and if so how common is this type of failure and what's involved in a repair?