Samsung PN51F5300BFXZA - Manual (Page 69)

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Clock Mode : Set the current time manually or automatically.
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Auto : The TV sets the current time automatically using the time from a
digital channel.
N You must have cable or an antenna connected to the TV to have the
TV set the time automatically.
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Manual : Set the current time manually.
N Depending on the broadcast station and signal, Auto may not set
the time correctly. If this occurs, set the time manually.