Mitsubishi LT-2220 Owner's Manual page 57

After you set the lock, you need your passcode to view
a V-Chip locked program, view the locked TV, cancel
the lock, or enter the V-Chip lock menus.
If you forget your passcode, you can view the locked
TV without entering your passcode. When your
password is requested, press the number  and QV
buttons on the remote TV control at the same time.
This process temporarily unlocks the TV.
When entering the V-Chip Lock menu, this process
deletes your old passcode and prompts you to enter a
new passcode.
Cut along the dotted line and file bypass instructions
in a safe place for future reference.
When changing or deleting your passcode, you must
use the remote control included with this TV. You
cannot use a Mitsubishi remote control from another
component or a "universal" remote.
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