To change between cable and antenna on your TV,
Press Home to display the "XMB" menu.
pick "settings" on the menu
then pick "channel" on the next menu
under channel settings, select "on" for cable and "off" for antenna TV.
Your user manual is available for download and option printing at the following link :
http://129.33.22.12/release/KDL40XBR4.pdf
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