Samsung LT27A750ND-ZA - Manual (Page 148)

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Standby Mode Upgrade
You can set the Standby Mode Upgrade function so that the TV downloads new
upgrade software when it is in Standby mode. In Standby mode, the TV is off, but
its Internet connection is active. This allows the TV to download upgrade software
automatically, when you are not using it. Because the TV is turned on internally,
the screen may glow slightly. This phenomenon may continue for more than 1 hour
until the software download is complete.