Friend you have a thermo problem, Unit is working after? Min. There is no one set answer for this issue, but there is a trick you can try that I use. And that would be to open the set, Turn on and use a hair dryer blow some heat on the power supply, Then the Signal board, Basically each board inside, The bad board will work quicker than 10min, This is how you can Isolate the problem, And once you have order that board and you should be fine..