Locked! Our jvc av27820 is locked and we require a (3) digit code. Please Help! have black square in the screen almost covering the whole screen;

text was turned On I suspect.

Hello
you have to unlock your jvc set, and reset the V-Chip settings. There are two ways to unlock JVC TVs, you have to find out which proceedings frome below mentioned will work with your TV.

[1]

Press the "Menu" button to set the lock code for your JVC TV. A padlock icon will appear on the menu display.

Press "Zero" to access the lock code function then use the left and right arrows to select the four-digit number for your code. Use the up and down arrows to move to the next area of the display.

Select the up or down arrow to finish your lock code then use the left or right arrow to save your lock code settings and exit the menu. You can return to this display if you forget your four-digit lock code and set another code.

Write your four-digit lock code down and keep it in a safe, private area.

Select the locked TV channel you desire to watch or want to unlock. A message will appear on the display requesting you to enter your lock code to unlock the channel.

Unlock your JVC TV by entering your lock code on the 10-key pad. The message "Invalid Lock Code!" will appear on the screen if you enter the wrong lock code.
[2]

Select "TV" from the menu then select "V-Chip" from the drop-down list on the screen. "Please Input Password" will appear on the screen.

Enter your four-digit password by selecting numbers on the 10-pad that appears on the V-Chip menu display or your remote control. Create a new password if you forget it by unplugging your TV power cord from the outlet then reconnect the power cord. This procedure resets your password to "0000." Enter four numbers for your new password using the keypad on the screen or your remote and select the arrow to advance to the next number. Press "OK" on your remote or select "OK" on the screen to set your new password.
Unlock a TV rating or TV channel by selecting "MPAA" or "TVPG" from the V-Chip menu. Use the up or down arrows to select the locked rating then select "OK" on the display or press the "OK" button on your remote control to unlock it. The MPAA represents the U.S. Motion Picture Association of America rating system, such as "NC-17," meaning not intended for viewers 17 years or younger. TVPG provides you

Hello
Closed Caption function is set to On in your JVC. look if there any button marked as "CC" on its remote control. If it is there, hit it till the closed caption function go off from your tv screen. If there is no such button found, get into its menu option, surf through, and get in to the closed caption option, set the close caption function OFF in that window. OK.

Did you unplug the set from the wall and wait 5 min. replug and try. Cusult your owner manual regarding parental Locks?

it is your captions turn captions off how old is you tv is it analog or digital tuner

go to your menu and turn off the ccd and text modes to remove the box,as for your lock out code try oooo or 9999.

the loc code is 000 finish and save settings and exit /st.

Your vertical IC is bad, need to change and also capacitor 100uf

Shut off the closed captioning and your problem will be gone.

I’m happy to help further over the phone at https://www.6ya.com/expert/dewayne_4a10eab6caecdb92

have your tv checked by a tech.probably your chip the eprom needs to be reset by lifting it up from the board and resolder back.some one could have put in a code for those channel.good luck.