Friend had a Phillips screen - one of the bits on the PCB went recently - he was told that 5 years is your maximum life expectancy. He wasn't too impressed as it cost him about £3k - so it's not just the car that depreciates like hell.
The bigger screens do give off some heat - recently installed some 60" screens for a client they consume 750W - almost a one bar electric fire. Even the smaller 42" ones were consuming 600W. We ended up installing three 60", one 63" and seven 42" screens - all in one house - Premier League footballer - say no more!