Here's another link that addresses the "How To Disable the Guide Plus on a RCA TV" question. I didn't try it. Here is a paste from that site:
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Instructions on how to deactivate the Guide Plus+.
Turn on the TV
Bring up TV Main Menu and select option 7 (TV Guide Plus Menu)
Select option 1 (TV Guide Plus Setup)
Find the MENU, GO BACK and Input button on your remote
Press the MENU Button then immediately:
Press the GO BACK button then immediately:
Press the INPUT button.
Note: It is important to press the Menu, Go Back and Input buttons quickly (within a second of each other)
You will Get a menu, Choose "Don't Remind Me Again"
Then Select OK
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The Guide Plus system is OK for our use even though it is a nuisance to have to press the "Guide" button on the remote to get it to go away each time I turn the TV on. I have noticed that it will not come up if I turn the TV on at TV with that button, rather than the Remote Power button.
To get the channels setup, I usually just hit the Menu button, then option 3 for channel, then option 1 for Autosearch. After that, you can immediately surf all you want.
The manual is 53 pages. If there is some specific thing you are looking to do, let me know and I'll see if it is there.
I did notice on the RCA site
www.rca.com there is possibly a manual available online if you know the Model #--
http://tv.rca.com/en-US/RLSearch.html
I don't have the model of ours and didn't want to pull it out of its mooring to find out.
The manual says "You must remove the Demo Pin from th G-LINK jack on the back of your TV in order for your TV to operate properly and to connect the G-LINK cable". It doesn't say what the "Demo Pin" does. Makes me wonder if that might be related to your questions.
Russ