The second document covers general video issues on external displays. The first document addresses how to correctly connect HDMI displays.
This is apparently a known issue, and Apple has two support documents with long lists of suggestions to help resolve the problem. In researching the problem, I’m finding others are having HDMI issues as well. That was the only reliable way I found to get 60fps. I had to use a USB C Thunderbolt to HDMI adapter with 60fps compatibility as a work-around. I have posted updates below to share significant changes to this issue. Initially it seemed like Big Sur and/or the repair resolved the video problems.
I also had the computer serviced and the main logic board was replaced. In November when I upgraded to Big Sur, I hoped that the intermittent video issues would have been resolved. After upgrading to Catalina, the display would intermittently indicate that there was no signal from the computer, and the computer would not recognize that there was a display attached. It worked fine through July 2020 when I updated to Catalina. In December 2019, I purchased a Mac Mini computer and connected a 42″ Samsung display using the HDMI port on the computer. Some people may have experienced HDMI output issues with the Mac Mini depending on what version of macOS is installed.
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