When the aspect is set to "full",the image

You can change how your tv displays in the video setting menu under display. You will have a choice between 4:3, 16:9, 16:10, cinema or automatic. I think to fill your screen the best you should choose 16:10 but this is not going to guarantee that all channels will fill the screen. It still has to do with how it is being broadcast to you.

get the on screen menu up , then find aspect ratio and use the volume control buttons to change the ratio until the screen and picture match , click ok and exit

The screen is probably adjusting to a particular aspect ratio. Not all images displayed will fill the screen. It is possible to modify the scrren size by using the FORMAT button ob the remote and choosing other aspect ratios or screen formats. Be advised that some of these may cause distortion of the image, so choose the one that provides optimal viewing and best screen coverage.

CHANGING THE SCREEN ASPECT RATIO: ( From Manual )
The TV can display images in four different modes: Wide, Zoom, Panoramic, and Normal. Each mode displays the picture differently. To change the screen aspect ratio:
1. Press the MENU button on the remote.
2. Use the Arrow buttons to highlight the Wide icon. Press OK.
3. Use the Arrow buttons to highlight your desired screen mode and press OK:
• Normal preserves the content's original aspect ratio. Since the 4:3 aspect ratio is not large enough to fill the TV's screen, black bars are added to the left and right of the display image.
• Wide stretches a 4:3 aspect ratio picture to the edges of the screen. Since the picture is being stretched, the display image may appear distorted. If the program is already formatted for widescreen viewing (1.85:1 or 2.35:1), then black bars will appear on the top and bottom of the display image.
• Zoom expands images with black bars to fit the screen.
• Panoramic expands the display image to fill the screen.
images may appear wider than intended.
If you are watching widescreen (1.85:1 or 2.35:1) content, black bars will still appear on the top and bottom of the display image. This option is only available when the TV is displaying a 480i/480p source.

if its a even 4 inch border on each side the set is in the 4x3 format, look for a button on the remote (read owner manual) for aspect.

Well this may indeed just be a setting, you need to look in your manual, with regards to Aspect Ratios and Screen Sizing. There are screen adjustments that can be made to make the image fill the screen. However the actual way in which it is done is individual to each unit.

If you were to go to the picture menu and select picture aspect ratio and select 16 X 9 or a different one that you have at present, that will fill the screen.

go into your customers setting and change you aspect setting to either full or auto

Not all programmes are broadcasted in a full screen format, they may show the programme with black bars on the top & bottom or left & right sides of the screen. If you have the TV in the Auto setting for the Aspect Ratio then the picture will be displayed in that size of format relative to the broadcast. If you want to fill the screen you can try a different Aspect Ratio to one that fills the screen to a wider image if available.

this is normal as you are looking at WIDE screen aspect ..