Samsung ua46d6400un E-Manual page 85

Volume: Set the desired volume level.
Source: Select TV or USB content to be played when the TV is turned on
automatically. (USB can be selected only when a USB device is connected to
the TV)
Channel (when the Source is set to TV): Select the desired channel.
Music / Photo (when the Source is set to USB): Select a folder in the USB
device containing music or photo files to be played when the TV is turned on
automatically.
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