Most RCA and GE TV sets use a four digit code to control the v-chip. The code reset procedure is different depending on the model. Try each method until you find one that works:

Hold down MENU on the remote and VOLUME DOWN on the TV it?s self at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked

Hold down the 0 on the remote and the VOLUME DOWN buttons on the TV its self at the same time for at least 4 seconds. The set won't say so, but the lock will be unlocked

Hold down the MENU button on the front of the TV and the TV button on the remote at the same time for at least 4 seconds.
Hold down GO BACK on the remote and MENU on the front of the TV at the same time for at least 4 seconds.

Hold down EJECT on the front of the TV and the MENU button on the remote at the same time for at least 4 seconds.

Depending on the model, one of the methods should unlock the V-chip. Now, if desired, you can change the settings on the V-chip by going to the MENU and going to PARENTAL CONTROLS, or on some sets, going to MENU and then going to TV SETUP, then to V-CHIP SET.