Samsung PN51D490A1DXZA - Manual (Page 124)

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English
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If you adjust the Cell Light , the Eco Sensor will be set to Off .
Min Cell Light : When Eco sensor is On , the minimum screen brightness can
be adjusted manually.
N If Eco Sensor is On , the display brightness may change (become slightly
darker or brighter) depending on the surrounding light intensity.
● No-Signal Power Off ( Off / 15 min / 30 min / 60 min ): To avoid unnecessary
energy consumption, set how long you want the TV to remain on if it’s not
receiving a signal.
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Disabled when the PC is in power saving mode.
● Auto Power Off ( Off / On ): The TV will be automatically turned off after 4 hours
of being left idle to prevent overheating.