Trying to unlock parental control on my sylvania VCR/DVD player. Accidentally locked all six locations.

I don't know if this will work but try entering four 0 (zeros) first. If it doesn't work enter as many 0 (zeros) that you can and see if that works. Hope this helps :)

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.

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

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

By parental control I don't know if you mean child lock. If that's the case you should be able to turn it off by pressing child lock on the remote control until off shows in the display window.

You should be able to find parental controls in the main dvd on screen menu

The parent control lock out code is 1234, you need to press yes then enter the code using the remote type in 1234 then press play button again and it unlocks the parent controls!

Try power on the player with no disk in the drive. Press "PAUSE" on the remote. Enter "3 1 4 1 5 9" on the remote (the word COdE appears on the display). Enter "0" on the remote (0 = All Regions, 1 = Region 1, 2 = Region 2, etc.) . Press "PAUSE" on the remote. Power the player off and then back on

use password 3308 to change the parental control to 7, and the movie will run

Called Zenith.  They said: turn on the DVD player.  Hit "set-up". Scroll down to the "lock" icon.  Scroll over to "Rating". Scroll over to unlock.  Enter 0000.  Click on Ok.  Enter 0000 again, click Ok again.  Menu should read unlock.  Voila!