It is weird, because if the Z9S HDMI port was physically faulty you wouldn't be able to get a signal at all, and as I understand it you get a picture when connected via Marantz SR 5001?
Things to try:
* Set display out to most compatible settings:
- Settings - Display - HDMI Mode: 1080P 60Hz
- Settings - Display - Color Settings - Deep color mode: Priority 8bit
- Settings - Display - Color Settings - Color space mode: Priority YCbCr 422
- Settings - Display - Color Settings - Color space mode: HDMI Range Mode: 16-235
- Settings - Display - HDR: Disable HDR
If you now get a picture when reconnecting to the other displays try changing each of the above until you figure out which is causing the problem.
Other things to try:
- Settings - Other - About - Advanced Settings - HDMI CEC: Disable
- Settings - Other - About - Advanced Settings - Developer options - Video Color Mode - YCbCr420 8BIT (idea same as above, to find a mode that works so a process of elimination can be used to find the problem).
- Settings - Other - About - Advanced Settings - Developer options - Ignore HDMI EDID. (in case the problem is incorrectly transmitted EDID data from the display device)