Samsung PN51F4500AF User Manual page 48

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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
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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.
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Lock is on, you cannot use PIP.
Main picture
Component, HDMI
English
Sub picture
TV
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