I think the first thing to do is contact Emerson and ask them if there is a way of unlocking or recovering the password. I have no experience of Emerson, but I used to have a Sharp TV that required two buttons on the TV itself to be held down while the set was powered on. This took the TV into a maintenance mode where all the settings could be changed.
You need expert guidance on just what to do as changing a wrong setting could stop the TV from working.
If you registered the TV for a warranty, get the relevant details ready in case they ask for some form of proof. The TV serial number, date of purchase, your name and address and where it was purchased are all likely proof of ownership questions.
Good Luck.