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Thanks for responding... much appreciated!
I've carefully examined both places... nothing in either except black plastic. The only things (on the back) are the vertical rectangle into which we plug the cables, and the electrical cord input. Zero switches.
Mine is an NU6900 (65").
FWIW, I called SAMSUNG tech support, and the rep checked and said he could not find any documents that show the Power button on this model. (I assume there is one!)
Is there a way I can upload a shot of the back of the TV?