Samsung UN60ES7500FXZA - Manual (Page 238)

you use TV. Sound Feedback is enabled
by default. Turn off Sound Feedback or
adjust its volume.
●
Panel Lock
Lock or unlock all the keys on the front
panel at once. When Panel Lock is on,
none of the keys on the front panel
operate.
●
Boot Logo
Displays the Samsung logo when the
TV is turned on.