Panasonic TX-L24XM6B 24" VIERA LED TV About 6 years old. Was watching it and pressed a button and then no channels. The error message is please scan to retune which i did but no channels were identified by the TV. Tried it on another aerial in another property and same problem. Only used for TV nothing else. There have been transmitter work, but the Mendip transmitter required the TV to be retuned on 5th June and it has worked fine since then. Is it past its use by date?