Reset forgotten lock password. Child Lock. Lock System. Key Lock. Passcode. Unlock key. Lock System.
1. Go to "Lock" tab and pop - up dialog password with 4 digit.
2. Press "MUTE" button 3 times.
3.Pop - up new dialog with 6 digit.
4.Enter master password 129472 (* try 210499 for older version of LG TV)
5.Enter your new password.
6.Done.