Hello i recently had a problem that my tv just locked itself which i think is the same type of problem, i contacted Daewoo and they gave me the following code to try and it worked, not sure if it will do the same for your set, but it might be worth a try.
press the following buttons in the remote in sequence
STANDBY TO TURN OFF
STANDBY TO TURN BACK ON.
Hope this might help, if not try contacting Daewoo Electronics website and put in your model number.
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Possibly, you will need an original remote to disable or turn off this feature. And some child lock can be accessible through neither MENU of your tv or remote. Check CHILD LOCK option to remove it. If it is a screen lock type of CHILD LOCK feature of tv (a Blue Background display a LOCK icon) and your original remote is lost, try a universal remote for you to possibly unlock it. Thanks for using Fixya.
Apex child lock release sequences
AT3208Push and hold the "F" button on the remote and press mute. Release then press 6688
PF2020Push display for 10 seconds and enter 3308
GT2711Enter the pass code of 1225 to clear
Apex TVs use a four digit code to control the v-chip. The override code for many models is 6688. Other sets may not have one, or may have a default code of 1225 instead of an override code.
To use the override code:
Hit the MENU key to get to the menus.
Go down to the SYSTEM menu and hit the right arrow on the remote control.
Once in the SYSTEM menu, go to PARENTAL GUIDE. It will ask for your code.
Enter the override code listed above. From here, you can turn on and off different rating restrictions, as well as set a new code.
No matter what the V-chip code is set to, the override code will still work. If you have a blank screen with a red key on the bottom left, simply press the function or F button and the mute button at the same time. This will unlock the screen and allow you to view the channel as desired
You might want to try the same solution for the V-Chip (this might be the same thing as the child lock, it is worth a try) protection to see if this will help:
Changing V-Chip Settings for MV13L3, TV/VCR Combo 2001.
-Unplug your tv for 1 minute. -Plug your tv in and turn it on. -hold the volume down button on the tv at the same time you hold the "0" button down on the remote. This will bring up the "Set V-Chip" blue screen. -Enter "0000" for the password and hit enter. Enter "0000" to confirm the password and hit enter. -This will bring up the V-Chip set page. From this page you can: Turn Off the V-Chip, Change the Limits for viewing, etc. -If you turn off the V-Chip setting, you will not have to deal with this problem again.
If your set has a blue screen with a small red lock on it, yes you are in the child lock mode, if there is no red lock on the blue screen then no you have another problem. The trouble is, if you are in the child lock mode, you cannot get out of it with out the proper remote hand unit. you will
need to get an original replacement remote from Here:http://www.remotes.com/remotes/servlet/rs?a=gmi&smodel=GT2015DV&brand_pn=APEX_GT2015DV&mode=large&uid=11834488446870
There is no other way I'm afraid. Good luck