Samsung Smart TV integration: How to change source to TV?

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I have the integration Samsung Smart TV installed. It generally works properly with my Samsung TV UE55MU8000.

I have to admit that the integration’s documentation could be improved, in particular more YAML examples should be added. I had to play around quite some time (trial and error) to find out how to properly change channels and to change/select the source (i.e. HDMI, Netflix, YouTube). See my YAML sniplets below for your reference.

However, I still fail to simply change the source to TV (eg after using Netflix or YouTube). It does neither work via selecting TV as source in the dashboard media player card (whilst selecting any other source like eg Netflix does sucessfully change the source)

2023-12-08_22-40-14
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… nor does the following service work to change the source to TV (whilst selecting any other source like YouTube, HDMI or Netflix works)

service: media_player.select_source
data:
  source: TV
target:
  entity_id: media_player.fernseher

What am I doing wrong???

For your reference here are my working YAML sniplets for changing the channel

service: media_player.play_media
data:
  entity_id: media_player.fernseher
  media_content_id: 15
  media_content_type: channel

and for changing the source

service: media_player.select_source
data:
  source: HDMI
target:
  entity_id: media_player.fernseher
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