Samsung Series 4 4000 User Manual page 122

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