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I had the exact same problem. Thought I could fix it by replacing the thermal fuse . . . no luck there. Problem continued. After tons ( I do mean tons) of research, I found the problem to be a temperature sensor. Makes total sense ! ! ! The tv is trying to come on, but the temperature sensor is bad, telling the tv that it is too hot to operate, so it turns itself off - only to try & come back on 30 secs or so later. Hard to fix unless you know your way around tv circuits. Took me bout 3 hrs total.
remove the ac adapter
take the battery out
be sure nothing is connected with your laptop
then press and hold the power button for 60 secs to drain static as it is the most probable reason laptops stops working.
then connect the ac adapter only and without the battery try powering on the system
if it powers on
you can again shut it down
insert the battery
it should surely power on