I forgot my passcode. The TV requires a 4 diget code to unlock the TV

I would just take it to a instore mobile phone repair man/or lady usually chinese are great at what they do not expensive .

If you forget your passcode, you can view the locked TV without entering your passcode. This is done by pressing the number 9 and QV buttons on the remote TV control at the same time, when your
password is requested. 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.

To recover a locked iPhone iOS Forgotten passcode or device disabled after entering wrong passcode

Forgot iPhone 4 password? take it easy, there is pro article to help you: http://www.windowspasswordsrecovery.com/iphone/forgot-iphone-passcode.html

If you forgot your pin code or can't remember the safe location, you will need to send it to Garmin to unlock it.

Bypassing the V-Chip Lock on most Mitsubishi sets:
Mitsubishi sets use a four-digit passcode that is required to view a V-Chip locked program, view the locked TV, cancel the lock, or enter the V-Chip lock menus.
If you don't have the passcode, it is easy to bypass. This is neccessary if you forgot the code, purchased the set used, or if you simply don't feel like searching through your files to find it.

To bypass the V-chip: You can view the locked shows by pressing the number 9 and QV buttons on the remote at the same time, whenever your passcode is requested. This process temporarily unlocks the TV.

To reset the code: When you use the button combination 9 and QV while entering the V-Chip Lock menu, this process deletes your old passcode and prompts you to enter a new passcode.
Good luck, and let us know how you made out with this TV set.

Bad News... you may have to Restore from iTunes. Here is some info from the users manual:
Passcode Lock By default, iPhone doesn’t require you to enter a passcode to unlock it. Set a passcode: Choose General > Passcode Lock and enter a 4-digit passcode, then enter the passcode again to verify it. iPhone then requires you to enter the passcode to unlock it or to display the passcode lock settings.
Turn passcode lock off: Choose General > Passcode Lock, enter your passcode, and tap Turn Passcode Off, then enter your passcode again. Change the passcode: Choose General > Passcode Lock, enter your passcode, and tap Change Passcode. Enter your passcode again, then enter and reenter your new passcode.
If you forget your passcode, you must restore the iPhone software. See “Updating and Restoring iPhone Software” on page 204.
Set how long before your passcode is required: Choose General > Passcode Lock and enter your passcode. Tap Require Passcode, then select how long iPhone can be idle before you need to enter a passcode to unlock it.

i forgot my 4 digit code and i dont know how do i unlock

Bypassing the V-Chip Lock on most Mitsubishi sets: Mitsubishi sets use a four-digit passcode that is required to view a V-Chip locked program, view the locked TV, cancel the lock, or enter the V-Chip lock menus. If you don't have the passcode, it is easy to bypass. This is neccessary if you forgot the code, purchased the set used, or if you simply don't feel like searching through your files to find it. To bypass the V-chip: You can view the locked shows by pressing the number 9 and QV buttons on the remote at the same time, whenever your passcode is requested. This process temporarily unlocks the TV. To reset the code: When you use the button combination 9 and QV while entering the V-Chip Lock menu, this process deletes your old passcode and prompts you to enter a new passcode. Good Luck