This video shows you how to reset forgotten password in your LG smart WebOS TV and how to enter your new desired pin code.
Steps how to reset:
MENU ➡ SAFETY ➡ Highlight "TV RATING LOCKS"
Press
"Ch Up, Ch Up, Ch Down, Ch Up"
The sreen will popup with "MASTER PIN CODE"
Enter "0313"
Password will reset to the default value "0000"