We got our ROku Soundbar on Wednesday, set it up with little to no problems. Its only HDMI so the optical cable had to be used as well. Worked well, even with the turning the TV on and off. We enjoyed watching shows Thursday and Friday night. Today (Saturday), we went to turn it on, TV came on, and we got "Unknown Signal" on the TV. You can hear the beeps of the Soundbar when you press buttons on the remote... so I assumed there was power and everything with the sound bar. I plugged my laptop into the HDMI Port and it worked just fine. When I unplugged the soundbar and plugged it back in .. the TV Did display the little bouncing ROKU screen, then... "Unknown signal". I cant get to the settings of the soundbar as I cant get the screen.... so is there any suggestions on what else I can try??
I only have one HDMI port on the TV. I tried two different cables and even plugged my computer into the HDMI port of the TV in order to see if it was the TV. The TV displayed the computer screen just fine.
I did however, do a factory reset (pushing the reset button for 10 seconds) and it started with the setup screen again. It has been working since with one important modification. I didn't change the display from 720p to Automatic (or 1080p). I have a feeling that we only watched things in 720p prior to it failing. When we attempted to watch something in 1080p.. the Roku automatically switched the signal.. and the TV freaked... and there was nothing to reset the soundbar back to 720p. Once I went through the setup again, I set it to only do 720p.. and we haven't had a problem since.
So the solution in this case:
Set specifically to a lower resolution that will work on the TV
I have this problem (on Roku Soundbar) too, so do many other people, as reported on the forums. Switching input source and switching back sometimes works. Unplugging the roku and plugging it back in sometimes works. Sometimes nothing works. Night before last, I fooled with it for an hour before I got it to work. Last night I fooled with it for 45 minutes, and gave up and went to watch on a small TV in the bedroom. Fix this!
1. When originally setting up with the Epson 5050UB projector I took the "auto detect" option and it did not work, so, I went through some of the other resolution options until I found a 4k 60fps option that did work. However, I had not gotten around to trying to play any 4K video.
2. I went to a 4K aquarium thing on youtube, and it played and looked great.
3. I turned off the unit and the projector.
4. When I turned back on the projector, I got the Not Supported message.
5. I went through some of the suggestions from the forums (many people are reporting this same problem) The one that occasionally worked was switching to the other hdmi input on the projector and back again repeatedly, but, it sometimes took an hour or more of doing this before you could get a picture again.
6. I tried soft reset on Roku, and as others describe on the forum, you get the bouncing Roku, but, then, you get the Not Supported. The Roku displays a solid light blue light.
7. I did a hard reset on the Roku, and spent all the time reentering passwords, doing activate links, etc. etc. what a pita!, but, now I am back up and running.
8. I now will avoid playing any 4K video and wait for Roku to fix the firmware. Go buy an Epson 5050UB and try to duplicate the problem, maybe? Or ask some of the others reporting this same problem on the forum what devices they are using?
I did switch hdmi ports, btw. I am using a high quality hdmi arc cable... since the soundbar is front and center in the room, and the projector is overhead, the cable is 50 ft.... switching the cable is not an option since those cables do not grow on trees, and it is run in conduit.