Hello!
It works if I press the |>| button to see what I have filmed before - then video plays on my windows PC in the Camera application (or any other webcam signal receiving app). But if I'm in shooting mode - hdmi transmits just the black screen.
The camera is connected via microHDMI-to-HDMI and a cheap USB capture card.
Internet says that this feature is supported by the camera:
> camera can output clean HDMI, in case you want to record video to an external recorder (source)
And there is a ton of such youtubes videos
Thank you!