Have TV Questions? Ask a TV Technician
Helllo , my name is ***** *****
Perhaps i can help you with this .
In order to be able to select the plug&Play and turn off the demo , your tv needs to be in TV mode even if nothing is connected there .
Another way to disable this usually is vol up or down directly on the tv and while the volume bar (OSD ) is still on the screen Press and hold menu 8 secs
Let me know how that goes and If that answers your question please do not forget to rate by clicking on the star icons at the top, then click on Submit so i get paid for my time helping you .Also note that it will not close this post , you can come back here at any time if you have questions. Thank you