LG LM40 Service Manual page 36

Ch3. System information
c. If the following message appears, enter a new supervisor password and then press Enter.
A password must be consisted of numbers 0~9, and have the maximum length of 8.
d. If the following message appears, press Enter.
e. Press F10 to save the new settings.
f. If the following message appears, select Yes and press Enter to restart the computer.
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