With 8K upscaling and multiple HDMI 2.1 inputs, the RX-A2A’s HDMI board is sensitive. The manual reveals how to reset the HDMI ICs via the service menu and where to probe for 3.3V and 1.8V supply rails.
You can access the various official manuals through the Yamaha RX-A2A Support Page : yamaha rx-a2a service manual
Check your current version by touching on the front panel and navigating to Settings > Firmware Update . With 8K upscaling and multiple HDMI 2
The official is a proprietary technical document intended for authorized service centers and is typically not available as a public consumer download on Yamaha's support portal . However, you can find a comprehensive User Guide and Troubleshooting documentation through the Yamaha Online Manual for advanced configuration and basic repairs. Service & Troubleshooting Essentials The official is a proprietary technical document intended