Lock and unlock codes for tv?

Polaroid:
Having trouble with setting your Parental Controls (V-Chip)?
The factory preset password is 0000. This password must be used first before setting your own personal password. It is recommended that you keep your personal password in a safe place and away from children. In the event you loose your personal password the master password is 8202. The master password overrides all passwords. The master password can't be changed and should be kept in a safe place away from children.
0000, 1078, 1111, 3808, 5050, 8202.
Mitsubishi LCD TV:
Bypassing the V-Chip Lock After you set the lock, you need your passcode to view
a V-Chip locked program, view the locked TV, cancel
the lock, or enter the V-Chip lock menus.
If you forget your passcode, you can view the locked
TV without entering your passcode. When your
password is requested, press the number 9 and QV
buttons on the remote TV control at the same time.
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.

AOC: 0,0,0,0
LG: 7,7,7,7
PHILIPS: 0,7,1,1
SONY: 4,3,5,7

Emerson/Sylvania/Funia: 0000
NOTES from Emerson/Sylvania/Funai:
1.Make sure to enter the exact same new password in the
"Confirm Password" space as one in the space. If they are
different, the space is cleared for reentering.
2. Your password will be erased and return to the default(0000) when a power failure occurs or this TV has been
unplugged for more than 10 seconds. If you forget the password,
unplug the power cord for more than 10 seconds to
restore the password to 0000.