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Source: Select TV or USB. Select TV and the TV will display broadcast or cable TV programs when it turns on automatically. Select USB and the TV will play content from a USB device when the TV turns on automatically. (You can select USB only when a USB device is connected to the TV)
Antenna (when the Source is set to TV): Select Air or Cable.
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 you want played when the TV turns on ▶ automatically.