Parental control Suddenly my Tv is blocking channels and the default code is not working. I've never set any parental controls. The default code does not unlock them. Also, the channel (up, down) function is not working. I have to type in the channel number manually.

RCA TVs come with a child lock capability called V-Chip. It's a parental control system which allows you to block programs and films by content, age-based ratings and the ratings which come with the movies. The parental control is a code, sent by the broadcaster to your television. The V-Chip will not work if the broadcaster doesn't send the control, or if the parental controls are switched off or unlocked. The controls are set up in the TV's main menu. The default is off.
From the main menu choose "Parental Controls;" it's option six.
Choose the first option, V-Chip TV Rating Limit, and using the arrow keys and the OK button on the remote, scroll through until the TV-MA rating appears. Press the right arrow button to move the highlight over to the "Status" field and toggle to "View." Press the OK button. This will set the age-based ratings to Mature.
From the Parental Controls menu, select the second option, V-Chip Movie Ratings Limit and change the rating to TV_MA and the "Status" to "View."
From the Parental Controls menu select the third option, V-Chip Unrated Program Block and select item one, which will be "View."
Select the fourth option, which is "Channel Block." Highlight the Channel field and using the channel up and down buttons, go through and check they are all set to 'View." Any set to "Block" will need to be toggled back to View.
Lock the controls to activate the changes using item six on the "Parental Controls" menu.

RCA TVs come with a child lock capability called V-Chip. It's a parental control system which allows you to block programs and films by content, age-based ratings and the ratings which come with the movies. The parental control is a code, sent by the broadcaster to your television. The V-Chip will not work if the broadcaster doesn't send the control, or if the parental controls are switched off or unlocked. The controls are set up in the TV's main menu. The default is off.
From the main menu choose "Parental Controls;" it's option six.
Choose the first option, V-Chip TV Rating Limit, and using the arrow keys and the OK button on the remote, scroll through until the TV-MA rating appears. Press the right arrow button to move the highlight over to the "Status" field and toggle to "View." Press the OK button. This will set the age-based ratings to Mature.
From the Parental Controls menu, select the second option, V-Chip Movie Ratings Limit and change the rating to TV_MA and the "Status" to "View."
From the Parental Controls menu select the third option, V-Chip Unrated Program Block and select item one, which will be "View."
Select the fourth option, which is "Channel Block." Highlight the Channel field and using the channel up and down buttons, go through and check they are all set to 'View." Any set to "Block" will need to be toggled back to View.
Lock the controls to activate the changes using item six on the "Parental Controls" menu.
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Apex TVs have parental locks that allow you to block certain programs based on
their rating. When this feature is no longer needed and you want your TV to display all programming no matter its rating, you must unlock your TV. Unlocking your Apex TV is done completely from your remote control and does not require any tools. The process takes less than 5 minutes.
• Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button.
Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688."
Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels.

Your Apex TV has been locked by anyway. Just try this method to unlock it.
Apex TVs have parental locks that allow you to block certain programs based on
their rating. When this feature is no longer needed and you want your TV to display all programming no matter its rating, you must unlock your TV. Unlocking your Apex TV is done completely from your remote control and does not require any tools. The process takes less than 5 minutes.
• Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button.
Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688."
Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels.

These are the steps to unlock Apex TVsApex TVs have parental locks that allow you to block certain programs based on
their rating. When this feature is no longer needed and you want your TV to display all programming no matter its rating, you must unlock your TV. Unlocking your Apex TV is done completely from your remote control and does not require any tools. The process takes less than 5 minutes.
• Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button.
Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688."
Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels.

Apex TVs have parental locks that allow you to block certain programs based on
their rating. When this feature is no longer needed and you want your TV to display all programming no matter its rating, you must unlock your TV. Unlocking your Apex TV is done completely from your remote control and does not require any tools. The process takes less than 5 minutes.
• Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button.
Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688."
Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels.

Apex TVs have parental locks that allow you to block certain programs based on
their rating. When this feature is no longer needed and you want your TV to display all programming no matter its rating, you must unlock your TV. Unlocking your Apex TV is done completely from your remote control and does not require any tools. The process takes less than 5 minutes.
• Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button.
Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688."
Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels.

RCA TVs come with a child lock capability called V-Chip. It's a parental control system which allows you to block programs and films by content, age-based ratings and the ratings which come with the movies. The parental control is a code, sent by the broadcaster to your television. The V-Chip will not work if the broadcaster doesn't send the control, or if the parental controls are switched off or unlocked. The controls are set up in the TV's main menu. The default is off.

Instructions

From the main menu choose "Parental Controls;" it's option six.

Choose the first option, V-Chip TV Rating Limit, and using the arrow keys and the OK button on the remote, scroll through until the TV-MA rating appears. Press the right arrow button to move the highlight over to the "Status" field and toggle to "View." Press the OK button. This will set the age-based ratings to Mature.

From the Parental Controls menu, select the second option, V-Chip Movie Ratings Limit and change the rating to TV_MA and the "Status" to "View."

From the Parental Controls menu select the third option, V-Chip Unrated Program Block and select item one, which will be "View."

Select the fourth option, which is "Channel Block." Highlight the Channel field and using the channel up and down buttons, go through and check they are all set to 'View." Any set to "Block" will need to be toggled back to View.
Lock the controls to activate the changes using item six on the "Parental Controls" menu

This is what I found in the instruction manual on this and I posted it here for you. Try using 3355 for the code and everything else listed here. If that doesn't work, try the very last tip which tells you how to do a factory reset and repeat the first step using the 3355 as the code.

Here's the instructions from manual:

Parental Control
Parental Control allows you to block certain channels or programs so children cannot view
programs that are not age appropriate.
To enter the Parental Control menu, you need an
access code. The first time you enter, use access
code 3355. See "Setting an Access Code" on
page 33 for information on creating a new access
code.
You can set the following options to block
content:
• Channel Lock — Blocks selected channels
• Movie Rating — Blocks movies based on their rating (G, PG, PG-13, R, NC-17, and X)
• TV Ratings — Blocks TV shows based on their rating
• Block Options — Turns on or off all your parental control settings
NOTE: You can use Clear All to unblock the channels and programs that you have set.
NOTE: If the Block Control in the Parental Control menu is enabled, all the sub screens in POP (POP1,
POP3 and POP12) mode will be blank



Setting an Access Code m
After you enter the Parental Control menu for the first time, you can set your own four-digit access
code. If for any reason you lose or forget your access code, you can use the default code.
1 In the Parental Control menu, select Change Code.
2 Using the number pad on the remote control, enter a new access code.
3 Select Exit.




Reset the original factory defaults. Press Menu on the remote
control, select Setup, and then select Factory Reset

hello The parental control menu enables
you to limit access to programs that
may contain objectionable material
or are not suitable for viewing by
children. The default access code is
0711
may contain objectionable material
or are not suitable for viewing by
children. The default access code is
0711.
The following table provides details
about the menu items:
Component Function Range / Options
Lock Enable Enables the parental control lock. When
enabled, channels with objectionable viewing
content are blocked and can only be
accessed with a password. You can block
channels according to the movie or TV ratings
of the channel’s programs.
Off, On
Movie Rating Helps you block programs based on their
movie ratings. See “Movie Rating” on
page 25 for more details.
–
TV Rating Helps you block programs based on their TV
ratings. See “TV Rating” on page 26.
–
Change Code Changes the password for the parental control
lock.
Press the number keys to
change the password.
Reset Resets all channels and programs to their
default factory settings.
–

regards
shaun
Parental Control Menu
Lock Enable
Change Code
Reset
Back
Main Menu
Picture
Sound
Size
PIP/PBP
Parental Control
Channel Setup
Setup
Exit
Press Right to Enter
Press Right to Enter
Press Right to Enter
Press New Code
Off On
TV Rating
Movie