HOW TO UNLOCK PANEL LOCK TO A TV

There are a couple of things you can try.  These are outlined here with more specific instructions, on how to access Parential Controls on your tV.

•   Just see, today TVs are becoming similar to computers and use hardware and software, to deliver the picture and sound.  Similar how a computer can lock up, and then you have to reboot it, TVs will have similar problems that you can fix by resetting or rebooting them.  
• To reset your TV, unplug the power cord from wall outlet, and keep it for at least 5 minutes. [Hard Reset].  Then, plug the TV back in, turn the TV 'ON'.  If the problem still remains, you ahve to call customer support section of your TVs service center, or seek tech assistance.
• Here, Front Panel Controls are locked. Now, V-Chip feature is available in almost all TVs.  It will help the customer to block the programme based on violence, sexual content.  V-Chip software reads the code that most broadcasting stations send with their transmitting program.  The code contains an age based rating and content rating.
• Kidpass TM.:  This feature permits you to control the amount of time children watch TV.  You can adjust the time, and set the TV, self OFF by that time. 
• Front Panel Lock:  Feature permits you disable the controls on the front panel of the TV, so that, children can't change TV settings, without its remote control.  
• TV Lock-Unlock:  Allows you to set user defined passcode to lock the TV, to enforce parential control features.
• Channel Block:  Allow you to choose channels, which cannot be accessed without a the passcode to which the TV is locked. 
• Channel Dispay: Permits you to press 'INFO" to see, channel number, program rating, Lock/Unlock status etc:-
• FRONT PANEL LOCK.
• The front panel "Menu" button may be disabled.  If you have this function, use the remote control to 'Turn OFF" Channel Blocking, by selecting [Channel Block] in the parential controls menu, and choosing OFF.
• Try unplugging the TV for five minutes, and then plug it back in. Turn ON the tV and try again.
• To access parential control; follow these steps.

1. Press the Menu button to access the Main Menu.
2. Select the 'Parential Control' menu. (On some models you must first select the special Menu).  From it, access the Parential Control menu.
3. If the parential control is turned "ON", a screen requesting your password will appear.
4. Enter your password.  You have now unlocked the controls.  

For more details, refer to the user manual to your TV. Here given are general procedure to unlock front panel lock.