1. Enter the default password to unlock the TV. The default password of Sharp TV is usually "0000" or "1234". You can try to enter these passwords or refer to the passwords in the user manual.
2. Reset the TV to factory settings, which will delete all passwords and settings. You can use the TV remote control to press the menu button, then select Settings > Initial Settings > Factory Settings > Yes, and then press the OK button. This process will take some time to complete, and you need to reset the TV.
3. If the above two methods don't work, you can contact Sharp customer support or technical support to try to unlock the TV. They may need you to provide some additional information to verify your identity and provide an unlock code or other help.
Please note that in some cases, unlocking the TV may require extra fees or specific skills. Therefore, in order to avoid unnecessary expenses and troubles, it is recommended that you carefully read the user manual of the TV or contact a professional before trying any unlocking method.