try this manual;
[PDF] AT M C T
On the remote try pressing the ( F ) button and the mute button at the same time on your remote control.
Here's the link for the 2402s manual:
http://www.retrevo.com/search/v2/jsp/downloadPage.jsp?doc=4db1185db9d3369
Pass Code Menu
This menu allows you to change the access code for the Parental Guide
functions of the TV set. Pressing the “Menu” key when Pass Code
Control is highlighted. This will turn on or off the Pass Code function. With
the Pass Code function ON, you can also change the Pass Code. Use
the down arrow key to highlight “Pass Code,” then enter the new Pass
Code using the numeric keypad. Press the left arrow key when finished.
1. The factory default pass code of 6688 is also the override code, in case
you forget your new pass code.
2. The factory defaults have TV-MA and MPAA-X ratings blocked .
Hope this may help you
DON'T FORGET TO RATE: