Samsung UN32D4000NDXZA - Manual (Page 108)

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Auto❑Protection❑Time❑
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Auto❑Protection❑Time❑(Off❑/❑2❑hours❑/❑4❑hours❑/❑8❑hours❑/❑10❑hours) : If the
screen remains idle with a still image for a period of time you define, the TV
activates the screen saver to prevent the formation of burnt in ghost images
on the screen.