How do I find the LG TV password in order to mirror with iMac?

Q: How do I find my LG TV password if I have forgotten it?

A: If you have forgotten your LG TV password, you can try the default password which is usually set to ‘0000’ or ‘1234’. If that does not work, you may need to perform a factory reset on your TV to regain access.

Q: Can I reset my LG TV password with the remote control?

A: Yes, you can reset your LG TV password using the remote control by accessing the settings menu and selecting the option to perform a factory reset. Follow the on-screen instructions to complete the reset process.

https://logmeonce.com/resources/how-do-i-find-my-lg-tv-password/#:~:text=A%3A%20If%20you%20have%20forgotten,your%20TV%20to%20regain%20access.

Pin Code?

https://www.lgtvremoteapp.com/lg-tv-pin-code/#:~:text=If%20you%20forget%20your%20LG,code%2C%20which%20is%20usually%200000.