Rng150n turn cable off only - XFinity

Rng150n how to turn off cable box and leave tv on to access hd display settings? This remote will not turn off just box. It's new and I don't know how to get to settings. Help!

This question, "Rng150n turn cable off only," is about XFinity-Comcast TV television equipment.

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I recently purchase two sony bravia tvs. I programmed my xfinity xr2 remote to operate the tv; however, it turns the tv off but not on.