Sony KDL-55W900A - Manual (Page 210)

WIDE button on the remote control, set [Auto Wide] to [Off].
Check the [Auto Wide] setting in [Screen].
Suddenly the picture becomes small.
The picture becomes smaller during commercials due to the method used
by a provider to broadcast content. When HD content channels switch to
SD content (commercials), the picture may be small with a black border.
[Auto Wide] will not expand the picture while the content switches, since
the content information is regulated by the channel signal provider. You
can manually change the [Wide Mode] setting if desired, which will remain
in effect until you change the channel/input or manually change the [Wide
Mode] setting again.
Black box on screen.
A text option is selected although no text is available. To deactivate this
feature, set [CC Display] to [Off]. If you are trying to select closed
captioning, select [CC1] instead of [Text1] - [Text4] (options may not be
available depending on your region/country).
Black bands appear at the edges of the screen.
Some wide screen programs are filmed in aspect ratios that are greater
than 16:9 (this is especially common with theatrical releases). Your TV will
show these programs with black bands at the top and bottom of the
screen. For more details, check the documentation that came with your
DVD (or contact your program provider).
Programs in 4:3 aspect ratio will have bands on the left and right sides of
the screen.
Programs broadcasted in HD formats (720p and 1080i) with 4:3 content
will commonly have black bands on the left and right sides of the screen
which are added by the broadcaster.
[Auto Wide] will not expand the picture when the black bands on the sides
of the screen are added by the broadcaster. You can manually set [Wide
Mode] to [Wide Zoom] or [Zoom], which will remain in effect until you
change the channel/input or manually change the [Wide Mode] setting
again.
Some cable and satellite set-top boxes can also control the size of the
picture. If you are using a set-top box, refer to the manufacturer of the set-
box for more information.
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