Samsung PN51F5300BFXZA - Manual (Page 79)

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Min Cell Light : When Eco Sensor is On , lets you manually adjust the
minimum screen brightness.
N If Eco Sensor is On , the display brightness may change (become slightly
darker in most cases) depending on the surrounding light intensity. You
can control the screen’s minimum brightness with the
Min Cell Light
function.
●
No Signal Power Off : Sets how quickly the TV switches to standby mode if
it is receiving no signal.
N This function is disabled when an attached PC is in power saving mode.
●
Auto Power Off : The TV will automatically turn off if you don’t press a button
on the remote control or touch a button on TV’s front panel for 4 hours.