Last week I bought an Alto 6+ and had low volume problems (the tv speakers, 55r617, were louder and sounded better.) After 2 hours with support, they had me do a firmware update... then same problem as you, no sound through the bar, but the sub works. Ended up getting another new setup from Amazon.
Exact same issues. But this time I made sure nothing was plugged into the bar and it was freshly unplugged from power before doing the firmware. The update went fine, and I purposely kept the tv out of the equation and used Bluetooth via my phone. And yet again, no sound from the bar, but the sub sounds good. (Also jumped through all of support's troubleshooting again with no luck.)
So, obviously, the firmware is screwed up (amongst other issues). I tried to explain this to tcl support with no luck. So I'm just going to return the sounbars and get my money back.
If anyone has a fix for this, please post it.
