I had one that did that. Unplugging the power from the wall overnight would remedy the situation for a few days, sometimes several weeks.

Thanks albert_135, I've already done that but does not work anymore.

Thanks,

Oliver.

OK I am assuming that your TV has lost its color-started shutting off-- gotten color bars on the screen etc. for some reason there is not enough ventilation in the TV causing an over heating problem , here is what to do , if you have the back off get rid of the metal shield that covers the circuit board , then in my case i cut a hole in the back panel with a hole saw and mounted a computer fan powered by a 12 v power supply to the cover ,this keeps the guts nice and cool and cures the problem ,use an outlet block with a switch in it to turn the TV +fan off and on this repair only costs about 20 bucks and is a lot less expensive than a repair man who cant fix it, mine would shut off after 20 min and you would have to unplug it to make it come back on again , now it runs all day no problem