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Power button on the television itself may be stuck - go to the unit and press the power button se if it engages. If it depresses and sticks there is your issue - if it does not check the remote take out the batteries and unscrew the unit take the rubber pad out of the casing and spray out with canned air. If that doesn't do it - try unplug the tv from the wall for 1 minute or 2 and replug-in and see if the problem persist if so you will need to contact a tv repair shop but it sounds like the button on the tv needs to be cleaned because something is holding the power position in a spot to turn the unit off
the remote has nothing to do with the tv not turning on or off you should be able to push the power button on front of the tv and turn it on that way.if its not staying on then theres something more wrong than just a lost remote
I gave this advice to someone with this same problem so here it is again:
It sounds like your shutdown circuit is being activated. This is due to excess current being drawn. This usually happens in the High Voltage section of the TV or one of the deflection stages. Due to the nature of this problem I would suggest that you take it to a local TV repair shop or have a TV repair person come out and take a look at the issue. The HV section is dangerous and should be dealt with by a qualified TV repair technician.
Sounds like something is overheating or it is getting noisy power from the mains.
Try leaving it off for a while and point a fan at it, if it turns on and stays on for longer then it is obviously a thermal issue.
Such a problem would need to be addressed by a qualified factory trained repair technician.