I have my now tv stick connected into my sound bar via HDMI, the output runs via HDMI to my tv. I have no outputs on my tv so I have to do it this way.
When I turn it all on I get a few bursts of sound through the sound bar then nothing but I get a picture. Oddly when i was messing about with it all I found that if the tv was unplugged then the sound came through the sound bar!!
So it seems I can have sound but no picture or have a picture but no sound.
I use a 3 way HDMI splitter(I have tried this with and without the splitter), and my fire tv box and blu Ray that I also have connected both work fine.
This is really annoying me as it's the only way I can connect my now tv to my sound bar and without it I'm forced to use the pitiful excuses for speakers on my telly so I just don't bother and my watch list is growing, I can't cope!!!!