Product: TV/Video > TVs
When you set your TV to JustScan, you may see a snowy, garbled, black and white line on the top of the screen. Usually, this is caused by something called overscan.
Typically, overscan extends the picture beyond the edges of your TV set so that when you view a picture, there are no blank or snowy sections on your screen at any of the edges. JustScan removes the overscan and, using 1:1 pixel matching, adjusts the picture so that each pixel of the broadcast image is matched to a pixel on the screen. The picture fits the screen exactly.
Some broadcast programs, however, do not carry all the picture resolution information necessary to fill the screen when the TV is set to JustScan. The result of this lack of information is the overscan line ？ the area of the picture for which the resolution information is missing.
To eliminate the overscan line, you must set the TV to 16:9. The 16:9 screen size has overscan which extends the picture beyond the edges of the screen and removes the overscan line.
Note: The overscan line can appear on all channels, certain channels, or certain programs, depending what is being broadcast.