Hi! Welcome to the samsung members community.
I found this online
"UPDATE: Apparently I had been using HDMI 2 out ever since I set up the receiver but thought I was actually using HDMI 1 out. That's the port I typically plug into when using only one output. It appears my output problem started when I accidentally pressed the HDMI Out button when trying to power off the unit without knowing it. The HDMI Out button is dangerously close to the power button and easy to hit accidentally. I didn't really pay attention to the HDMI port number on the back of the unit when I was troubleshooting because I just knew I had it in HDMI 1 out. Every time I switched the HDMI output and cable on the unit I had the cable plugged into the opposite port of what I was setting the output to. I finally realized what I had done after I got it working with the dual output setting and viewed the system information on the screen and saw it was using HDMI 2 out. DOH! ***** move. Lesson learned. So, if you have a RX-V685 and your HDMI ↑ output suddenly stops working make darn sure you didn't accidentally press that little HDMI Out button
that is WAY to close to the power button."
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https://www.avforums.com/threads/yamaha-rx-v685-hdmi-output-issues-fixed.2219335/"
