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U have a CRT tube analoge standard tv,this feature will not work for a CRT analoge standard tv.Zoom in and out,picture sizes like 480,720 and 1080.The analoge tv can't get the tv signal ranges beyond 480i that why u have black sides bars picture,if u have a HD TV like a LCD tv or Plasma tv,than the Zooming in feature will works.
if you mean the left and right sides of screen, look for a button on remote might be labeled several things, like picture size, aspect etc.. the borders pop up when you go to a non high def channel. some chs put borders all around the picture in those cases you won't be able to get rid of those.
If you mean that you get a black box, with a little of the picture visible around the edges, then your closed captions are on and set to TEXT. This puts a black box on the screen about 10 seconds after changing the channel. Go into the menu and turn off the closed captions and the picture will be back to normal.