This might work to factory reset the tv .....
Code:
1. With the TV on, press and hold EXIT on the TV remote for 10 seconds.
2. The Factory Reset screen appears displaying a warning message.
Understand that all your settings revert to factory settings if you run the Factory Reset function.
Note: When the Factory Reset screen appears, Cancel is initially highlighted.
If you want to cancel the Factory Reset function, press ENTER now. Otherwise, go to Step 3.
3. Press the ◀ to highlight OK, and then press ENTER.
After the TV completes the Factory Reset, it powers itself off.
When you power the TV on for the first time after the Factory Reset, the Plug & Play screen appears just as if you had turned the TV on for the first time.