I have connected my device to my tv using an hdmi cable, I know the cable is working, I get no sound from the tv, only from the device. Having Googled the problem it appears that I should be able to adjust the HDMI settings. I can't, however, find any HDMI settings.
Right click on the speaker ICON - lower right next to the clock. Pick "playback devices" from the popup menu. There should then be a window showing the the HDMI channels and the audio device now in use. Do this with the HDMI cable connected to the TV. Activate the HDMI audio on the one connected.
This works for Windows OS, cannot say about the Android OS.
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