Lock icon and menu keeps appearing

Press the "Menu" button to set the lock code for your JVC TV. A padlock icon will appear on the menu display.

Press "Zero" to access the lock code function then use the left and right arrows to select the four-digit number for your code. Use the up and down arrows to move to the next area of the display.

Select the up or down arrow to finish your lock code then use the left or right arrow to save your lock code settings and exit the menu. You can return to this display if you forget your four-digit lock code and set another code.

Write your four-digit lock code down and keep it in a safe, private area.

Select the locked TV channel you desire to watch or want to unlock. A message will appear on the display requesting you to enter your lock code to unlock the channel.

Unlock your JVC TV by entering your lock code on the 10-key pad. The message "Invalid Lock Code!" will appear on the screen if you enter the wrong lock code.

Press the "Menu" button to set the lock code for your JVC TV. A padlock icon will appear on the menu display.

Press "Zero" to access the lock code function then use the left and right arrows to select the four-digit number for your code. Use the up and down arrows to move to the next area of the display.

Select the up or down arrow to finish your lock code then use the left or right arrow to save your lock code settings and exit the menu. You can return to this display if you forget your four-digit lock code and set another code.

Write your four-digit lock code down and keep it in a safe, private area.

Select the locked TV channel you desire to watch or want to unlock. A message will appear on the display requesting you to enter your lock code to unlock the channel.
Unlock your JVC TV by entering your lock code on the 10-key pad. The message "Invalid Lock Code!" will appear on the screen if you enter the wrong lock code.

Press the "Menu" button to set the lock code for your JVC TV. A padlock icon will appear on the menu display.

Press "Zero" to access the lock code function then use the left and right arrows to select the four-digit number for your code. Use the up and down arrows to move to the next area of the display.

Select the up or down arrow to finish your lock code then use the left or right arrow to save your lock code settings and exit the menu. You can return to this display if you forget your four-digit lock code and set another code.

Write your four-digit lock code down and keep it in a safe, private area.

Select the locked TV channel you desire to watch or want to unlock. A message will appear on the display requesting you to enter your lock code to unlock the channel.
Unlock your JVC TV by entering your lock code on the 10-key pad. The message "Invalid Lock Code!" will appear on the screen if you enter the wrong lock code.


OR

Select "TV" from the menu then select "V-Chip" from the drop-down list on the screen. "Please Input Password" will appear on the screen.

Enter your four-digit password by selecting numbers on the 10-pad that appears on the V-Chip menu display or your remote control. Create a new password if you forget it by unplugging your TV power cord from the outlet then reconnect the power cord. This procedure resets your password to "0000." Enter four numbers for your new password using the keypad on the screen or your remote and select the arrow to advance to the next number. Press "OK" on your remote or select "OK" on the screen to set your new password.
Unlock a TV rating or TV channel by selecting "MPAA" or "TVPG" from the V-Chip menu. Use the up or down arrows to select the locked rating then select "OK" on the display or press the "OK" button on your remote control to unlock it. The MPAA represents the U.S. Motion Picture Association of America rating system, such as "NC-17," meaning not intended for viewers 17 years or younger.

You need to hold the menu button for 15 seconds until the lock icon changes to unlock. Then you should be able to adjust the brightness of the monitor, assuming that the backlight is working properly. Hope this helps you.

It seems that the problem is the monitor is detecting that the menu button is continually being pressed or the switch is shorted. Try pressing the menu button a few times to see if you can make this stop. Otherwise, the monitor needs to be repaired. Hope this helps.

The padlock is an indication that the On Screen Display is locked. You can also lock or unlock the OSD by pushing the Menu button for over 15 seconds.
http://support.dell.com/support/edocs/monitors/e171fp/en/controls.htm

change micro switches..

Parental Guide On (Activate V-Chip)
Selecting this option lets you activate and deactivate parental control settings.
1. Press MENU on the remote control (the Main menu appears).
2. Press the button until the Parental Control icon is highlighted.
3. Press the button until the bottom PASSWORD is highlighted.
4. Enter your password using the numbers buttons on the remote (the PARENTAL GUIDE menu appears).
5. Press the button to highlight PARENTAL GUIDE OFF, then press the button to turn it on. It must be
on for rating limits to take effect.
If you do not activate V-Chip, none of the settings for V-Chip will take effect.
If you forget your password, you can reset it. Enter 5898 as the password and then change it to a new one.
Child Lock
Selecting this option lets you lock (disable) or unlock (enable) the TV’s front panel. The remote still tunes to
any channel. When using this as a Parental Control method, remove access to any remote that is capable of
operating the television.
1. Press MENU on the remote control (the Main menu appears).
2. Press the button until the Parental Control icon is highlighted.
3. Press the button until the bottom PASSWORD is highlighted.
4. Enter your password using the numbers buttons on the remote (the PARENTAL GUIDE menu appears).
5. Press the button to highlight CHILD LOCK, then press the button to turn it on.
Change Password
Selecting this option lets you simply create a new password at any time. Once you enter a new password
from CHANGE PASSWORD in the PARENTAL CONTROL menu, it is the password you use until you change it
again.
1. Press MENU on the remote control (the Main menu appears).
2. Press the button until the Parental Control icon is highlighted.
3. Press the button until the bottom PASSWORD is highlighted.
4. Enter your password using the numbers buttons on the remote (the PARENTAL GUIDE menu appears).
5. Press the button to highlight CHANGE PASSWORD, then press the button to select it.
6. Press the button to highlight NEW PASSWORD, and use the number buttons on the remote to enter
the new password. Enter it again in the confirm field to confirm the new password.

As per the last persons solution the key icon does indicate you have locked the photo. First select the photo you want to delete, press menu, select playback menu, the key icon appears, press the weird shaped arrow button to the right of the OK; phot unlocks and allows to delete!!

Here's the link for the product support page; http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?ctn=109S20&scy=us&slg=AEN&grp=PC_PRODUCTS_GR&cat=CRT_MONITORS_CA&sct=CRT_MONITORS_GT19_SU Click "User Manuals" on the left. or here is a direct link; http://www.p4c.philips.com/files/1/109s20/109s20_dfu_eng.pdf Check page 28: "The Main Menu displays OSD MAIN MENU LOCKED . Pressing the front control panels hasno effect. How can I unlock this function? Press and hold the OSD menu key for about 10 seconds until picture displays "OSD MAIN MENU UNLOCKED"" Hope this helps :)