Vizio L37 HDTV Manual page 40

VIZIO L37 HDTV User Manual
When at the first DTV screen, press the RIGHT arrow
button twice.
The PARENTAL CONTROL screen will be shown.
Press the OK button to highlight the bar.
Enter the four digit password. The factory default password
is 0 0 0 0. If you change the password, please make a note
of it in a safe place.
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Version- 02/27/06