Try this.
1. Put tv in dvd mode and wait until "NO DISC" is displayed.
2. Press "RETURN" button on remote.
3. Press "7" then "7" then "PLAY" then "ENTER".
4. Something like this should appear.
Player Version : MB52~~~~~~~
MPEG Version : 0311~~~~~~~
Servo Version : 0303~~~~~~~
Code Version : 3. 1. 6. 5
Region Code : 1
0 1 2 3 4 5 6
Select : ENTER Exit : RETURN
5. Use the cursor keys to select the region you want (0 for region free)
6. Press "ENTER"
7. Press "RETURN"
:D