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There should be a zoom button on the remote control. Each time you press it the size of the picture changes. If there is not a button on the remote, there should be a on screen menu display that allows the size to be adjusted. If you are using a HD cable box or HD satellite receiver, they also have picture zoom options.
I hope this helps
you can set the aspect on either remote. the best thing to do is set the proper aspect on the tv remote for regular (sd) channels, and then again for hd channels. the tv should remember these aspect settings and revert to them when you switch back and forth from sd to hd. if you have satelite, there is usually another aspect on there you can change depending on the program, but i usually recommend leaving it alone. if you are on an hd channel with side bars, switch to the sd version instead of changing aspect so you dont have to keep flipping it back and forth.
Some tv's have a setting in the menu that automaticly switches picture size. Going back and forth from picture to guide may be triggering this setting. You may be able to go into the menu and turn it off.
RCA hads a problem with it's sets switching back and forth on their own. This is covered under warranty. Some say first turn off the autoformat feature in Customer Menu, if this doesn't work, a board need to be replaced. I would contact Manufacturer and ask is under warranty. RCA/GE same !
If the television is connected to a cable box such as Time Warner's HD box, the picture mode can be changed by pressing the '#' on the cable box's remote keypad (where the channel numbers are). This cycles the picture between zoom, normal, and stretch which could be cause of your problem.