OK, well in my opinion, then you can (reasonably) rule out a software/firmware problem, as those are all of the tricks I could think of to "fool" or otherwise change the set's behavior. I would say, either just live with it as a quirk on a bargain (for you) set, or you would need to get your hands on service information if it is even available outside Samsung factory service locations. Others may have more or better suggestions. Neither of my Samsung flat-panel sets (from one and two years before your 2012 model) do any type of blanking like that.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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