Motorola DCT5100 User Manual page 46

Problem
There are black
bars on all four
sides of the picture
Possible Solution
This may occur on a 4:3 TV if the 4:3 OVERRIDE setting
is OFF. To cause 4:3 SD programming to fill the screen,
depending on the capabilities of the TV, set
4:3 OVERRIDE to 480i or 480p.
This may occur on a 16:9 TV if the active video for an SD
broadcast is in letterbox format. To confirm, wait for a
commercial or look for a graphic, such as a network logo.
If the commercial fills the screen from top to bottom, or
the graphic appears below the active video, the program
is being letterboxed by the broadcaster. You can
minimize this by activating the zoom feature on the TV.
A broadcaster may include black bars on either side of a
wide screen broadcast. This is called a "hybrid" aspect
ratio and results in a black border surrounding the video
on a 4:3 TV. Because this is part of the broadcast, the
DCT5100 cannot correct the video. You may be able to
minimize the border using the zoom feature on the TV.
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DCT5100 User Guide