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Hi , I`m JackPerhaps I can help you with this problem .
You did not give me the TV's full model number but usually for this serie , this DEMO or STORE mode can be removed in the SETUP menu under Plug&&Play and first time setup if you cannot see the option HOME/STORE right there .
Take a look and if you can`t find it , let me have the TV's full model number and I`ll find it for you .
In any case what you have is the store demo mode and it needs to be set to HOME .
If that answers your question please do not forget to rate (if not just let me know ,do not 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
By the way , you may have to set the tv in TV mode (with channel number on the screen) in order to be able to access it .
Doesn`t matter if nothing in connected in the antenna terminal
I will have to step out for a bit (dinner time) so if you have questions just send them and I`ll get back to you as soon as I return .