LG DM2350D Owner's Manual page 85

To use Key Lock
❐
SETTINGS ➾
Locks control buttons on TV.
✎ Key Lock function remains intact even in case of power outage or when the
power cord is removed from the wall socket.
✎ Key Lock function can only be set by remote control, and not by the button on
the TV.
✎ Even though
LOCK ➙ Key Lock
Key Lock is set to On, TV's buttons can turn on the power.