Locked dvd tray

To unlock tray
While the unit is turned off, press and hold the stop button, then press eject the button on the unit. "UNLOCK" appears on the front display panel.

press and hold stop button the palyer unlocked

Below is the only known process to unlock that model of DVD player. Does not work on 100% of dvd players.

1. Turn on dvd player
2. Open the tray
3. Press 0000 in the Remote Controller
4. Change to any region you want (0 for region free)
5. Press Pause to confirm your change
6. Turn off
7. Turn on again and enjoy

Hope this works for yours, please post back if it does. Thank you for trying Fixya!

Dear friend,
Press and hold stop+play button on the front panel of the dvd player more than 15 sec the player will be resetting

Hi there, I just had the same problem with my daughter, looked in the manual and it says to hold down the stop button and press the eject button on the unit. That should unlock it, its the same procedure to lock it, in case you want to prevent you daughter from attempting to play biscuits!! 
Regards, darren

The Disc Tray is Locked
If the message “Tray Locked” appears on the screen, the retail lock feature has
been accidentally engaged. To unlock the disc tray you must press and hold a
combination of keys simultaneously:
On the front panel of the DVD Player, press and hold the STOP, ON•OFF and
OPEN•CLOSE buttons for at least 3 seconds.

I forget the password Your player is equipped with a “back-door” unlock sequence. Press and hold
the STOP button on the front of the DVD Player and the STOP button on the
remote control at the same time. (Hold both buttons down at the same time
for at least 3 seconds).

Unplug for 5 min then plug back in... now press and hold the powers button for 15 seconds...thts should fix ya!

Dear friend,
press and hold stop+play button on the front panel of the dvd player more than 15 sec the player will be unlock

Dear friend,
Press and hold play+stop button on the front panel of the player more than 15 sec the player will be unlocked

with the unit off press and hold the stop button and the eject button.