Good morning

We bought a Smarttv hyundai hyled5809g4km, but we're now facing some issues: Our smart Tv doesn't have a button or something to do an screencast, when a look the smart tv on my laptop the tv doesn't is not found. This is very important for us because me make meeting two days a week, and the functionality doesn't work, or we don't how to make it. The other problem is, given we can´t screencast, we decide to make a conexion via hdmi cable, but now the issue comes with non audio visualization (There is image but ain't audio).

I made a factory reset but it didn't solve the problem.

What ca I do?

Thanks a lot