My toshiba 36in crt tv's demo mode keeps turning it self on

Refer its user manual for details.

read owner manual

Viewing the demonstration (DEMO) mode
The DEMO mode automatically demonstrates several features of
your TV.
To start the DEMO mode:
1. Press MENU.
2. Press left or right button to highlight the SET UP menu.
3. Press up or down button to highlight DEMO.
4. Press left or right button to highlight START.
To stop the DEMO mode:
Press RECALL, EXIT, or POWER.
I hope this helps. Thanks for using fixya.

Viewing the demonstration (DEMO) mode
The DEMO mode automatically demonstrates several features of
your TV.
To start the DEMO mode:
1. Press MENU.
2. Press < or >to highlight the SET UP menu.
3. Press up or down to highlight DEMO.

4. Press < or > to highlight START.
To stop the DEMO mode:
Press RECALL, EXIT, or POWER. This should do it for you. Thanks for using fixya.

let the card be cleaned with sprit, some contacts are still holding down.
that will solve your problem

Press menu
Press left or Right to highlight Setup menu
Press up or down to highlight DEMO
Press Left or Right to highlight STOP
Exit the Menu.

Change the eeprom

Hi i,m ken I am working on this problem, I found this tv has chip problems, start at the power supply ($100) and go from there. If the power supply checks out ok check the chips, there is a way to reset the chips, also disconnect any add ons to the tv, and try that. I was told you can remove the batteries from the remote press all the buttons and reset the chips, but they did not have good results! I will keep working on this. ken

Demo is activated / de-activated by holding a combination of
two buttons on the tv front for at least four seconds. Try menu &
power or vol up & chan up...........T.

Please rate this solution.......

to turn off the demo mode on model 32af42 toshiba tv you can either press recall,exit or power buttons / if this fails enter the menu screen go to the setup menu highlight demo select stop .