SOURCE: Samsung remote won't turn 630 LCD off. Only volume works.
yo moel
the way i did it was take the batteries out and hold powere button for 5 seconds put batteries back in and should be fine mate!
ahmed
SOURCE: optical input shutdown receivers
If they shutdown it is because they are getting to hot, Keep the vollume down to a cival leval,
SOURCE: samsung tv keeps turning it self of
You don't indicate model number or age of your samsung tv, although it's very likely you may find swollen tops on one or more electrolytic capacitors on the power/inverter module. The tops of the caps may bulge like those i've pictured. You will need soldering skills to replace these parts. Value and polarity are very important while replacing electrolytics. 
SOURCE: My new polariod smart tv keeps turning itself on and off repeatedly and the remote will not wotk
Could the standby button on the remote be sticking on? If not then return it under warranty!
SOURCE: My Samsung Smart TV Model # UN40F6300AF keeps turning on an off on it's own
Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
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