Thanks for the response, I have to admit, getting (insert word of your choice) discouraged!
They are the latest gen applet tvs. Just bought the one that is in Stereo mode in December.
Monitor is a pc monitor 4k from ACER.
Projector Epson 2350
Yamaha RX A4a
Dac Reimyo DAP 777
Applet tv (1) for HT is a 4k Model a2843
Applet tv (2) for Stereo is a 4k same model a2843
Both are up to date. The Yamaha is plugged Ethernet and has the latest firmware update.
The converter I don't see the model number, but it is HDCP 2.2
This time to get it going again, I had to unplug both Apple tvs and plug only the HT one.