Samsung PN51F5300BFXZA - Manual (Page 46)

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You may notice that the picture in the PIP window becomes slightly
unnatural when you use the main screen to view a game or karaoke.
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When Program Rating Lock is on, you cannot use PIP .
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PIP Settings
The picture from the external video source will be in the main screen and
the picture from the TV’s tuner will be in the PIP sub-picture window.
Main picture Sub picture
Component, HDMI TV