Onida tv model 21SLU250 set dead

You have to enter its service mode option to correct this. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
NB: Please read and understand well, the instructions to enter the service mode, before you begin. Be very careful. Note how to "EXIT" the service mode; after entering and adjusting data. This is very important.

I assume it to be an Onida TV. If you wish to get some details, http://electronicshelponline.blogspot.com/ Pull up older posts. Service mode entry procedure to many brand TVs are given.

firstly press hotel mode icon and enter 5963 password.

you can lock/unlock above functions by pressing zoom and negative volume control keys simultaneously.

press disp+vsm together here it opens service menu at last of that menu there is restore option press 1 to INT . press 1 and your tv will restore.

i want enter password for Onida TV for all models

sir my onida tv 21'' ineed un lock

Try with 1147 (This one worked on my ONIDA TV) OR 5963 OR PRESS ZOOM BUTON AND VOL- KEY BOTH.

PAVAR SAPYA VAL NAKADT