Samsung PN51E6500EFXZA - Manual (Page 211)

player attached to the HDMI In jack.
N While Smart Hub or Program Rating
Lock is on, you cannot use PIP .
●
PIP
Activate or deactivate the PIP function.
●
Air/Cable
Select either Air or Cable as the input
source for the sub-picture screen.
●
Channel
Select the channel for the sub-picture
screen.