Samsung UN46ES7500F E-Manual page 466

Energy
Try resetting the picture to view the default
picture settings (go to
Picture).
There is a dotted line on the edge of the screen.
If the
it to 16:9.
Change the cable/satellite box resolution.
The picture is black and white.
If you are using an AV composite input,
connect the video cable (yellow) to the
Saving)
Picture Size
Picture
is set to Screen
Reset
→
Fit, change