LG 42PM4700 Owner's Manual page 122

To return to initial settings
❐
HOME ➾ Settings
Returns to initial default mode by deleting all optional setup.
Once initialization is completed, the TV will turn off and on by itself.
✎ If Lock System
✎ Do not turn off the power during initialization.
➙ OPTION ➙
is turned on, a pop-up will be prompted to ask for password.
Initial Setting