The "problem" you describe is probably due to bandwidth limitations in the camera processor. You might be surprised to find that the Sony FS5 display goes black when you use the DCI RAW output when shooting 4K.
The solution is simple. Instead of an external monitor, use a monitor/recorder. An Atomos Ninja V is my current solution. Although only 5" (diagonal), it is bright and sharp enough to judge the focus quality. Furthermore it records in low-compression ProRes from HDMI. In addition to recording, the Ninja V has a configurable HDMI output which can drive other devices without burdening the camera (or recorder).
I wish I could do that. However, a few things. These monitors are expensive. Also, I am a videographer that videotapes athletic events. I have a 25 ft high-pod that has the camcorder elevated in the air. Down below I have a 10 monitor that I view the game through and follow the action as it is displayed. My media is being recorded on a 256 gig SD card. I just want to be able to see the game on the monitor. Once I am done, I upload the video to my computer, edit the game, and display on my site for the teams. I also create highlight videos from the games. Is there another camcorder that I can use that will let me use the HDMI 4K monitor feature?
Sony FDR-AX100 shuts off HDMI output when recording in 4K
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I wish I could do that. However, a few things. These monitors are expensive. Also, I am a videographer that videotapes athletic events. I have a 25 ft high-pod that has the camcorder elevated in the air. Down below I have a 10 monitor that I view the game through and follow the action as it is displayed. My media is being recorded on a 256 gig SD card. I just want to be able to see the game on the monitor. Once I am done, I upload the video to my computer, edit the game, and display on my site for the teams. I also create highlight videos from the games. Is there another camcorder that I can use that will let me use the HDMI 4K monitor feature?