I found this topic while looking for support of my Medion TV with Vestel MB230. It seems the mentioned home assistant integration here does not work anymore on newer model mainboards, the integration is depending on an closed network port on these newer mainboards. So I could not get this integration working on my TV.
However in the past my TV was found bij HA by the DNLA integration, then I was able to select the source and also to mute the volume through it. But somehow this stopped working. I don't know if it is a HA or TV update which stopped it.
Only thing I found in the Service Menu there is an option 3 : Smart Home Activity State which is disabled on my TV set. I checked the profile editor , but cannot find this option to enable it.
I guess it is the wrong topic to ask. But how can I find out how to enable the Smart Home Activity State option ?
* Sorry for the Dutch, Uitgeschakeld means disabled