My father bought Thomson television 2 years ago.it was fifth colour television in my home.No colour TV used to last more than 2 years.As in my home the TV use to be in on mode for whole day.
But, this Thomson flat is still working like a new one.the warranty period is for three years but it is never required to call a expert for my TV.so I would suggest not to go for famous brands but to go with Thomson.