A:Answer Hi: Yes, your new Samsung should work without the Cable Box! I have mine turned off regularly (I have DishTV Satellite), since I usually turn it off before going to bed and when we're not watching TV programs, we are streaming amazon and Netflix as you are with no problem. I personally watch more stuff online than regular TV. By the way, don't you just love the 4K picture?
Best,
MarcB53
Southern California