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What you are seeing is the input frequency and all of them are 60Hz. The TV doubles this internally and displays them at 120Hz. I admit I don't know where you are in settings that would show this. But the TV actually handles motion at 240Hz. When mentioning 120 I wonder if you are speaking of voltage which is 110-120V 50/60Hz. If the picture is not satisfactory keep in mind you may need to tweak things as Samsung defaults to some motion settings to cope with older resolutions up to 1080p. You may get a better picture by going in to Picture/Expert Settings/Auto Motion Plus Settings. If 4K content looks fantastic but local sports or older Blu-rays/DVD do not play around here. Actually play around here for 4K content too and you might be happier. The Auto Motion Plus settings can give a "soap opera effect". You can set these per input. If you have a Blu-ray playing 4K try turning it off (harder to do with a mix of inputs from a receiver). But Auto might work better for sports from a local station at 720p or HD from a cable/sat provider at 1080i. If the picture looks great already then don't worry about it. The magic is happening inside.
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