I experienced the same thing with my 43" Sammy Plasma, I was in the kitchen and I heard like a book that falls flat on the floor, kind of a loud pop and then when I returned to the Sala, the TV is off already and it wont turn-on. Only the red pilot lamp is blinking when I press the on button of the remote.
Tried disconnecting and reconnecting the power cable but to no avail. Hope I did not make the problem worse than it is already. :-(
My TV have not yet reach 5 years and this past two years bihira na lang magamit dahil gabi na kami palagi nakakauwi and then sa tablet at laptop na lang nano-nuod ng movies.
Planning to bring the TV tomorrow, crossing my fingers and praying that it can still be repaired.