LG 42LD550 Owner's Manual page 119

If you don't press any buttons for a while, the play information box
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will float across the screen. This prevents screen pixel damage due
to a fixed image remaining on the screen for a extended period of
time.
002. B02.mp3
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!
NOTE
►
A damaged or corrupted music does not play but displays 00:00 in playtime.
►
Music files with copy-protection will not play.
►
Press ENTER or button to stop the screen saver.
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00:31 / 04:04
119