I had the same problem with my d9400 so your not alone. It doesn't like the sync signal with the games you mentioned. It's been awhile, but I remember reading that if you split the composite sync signal into separate horizontal and vertical sync it should work. I never tried it though. I ended up getting rid of the monitor before I could.
I also had the problem of 90's midway games such as mortal kombat, killer instinct, nba jam displaying incredibly dark. Even with the RGB and contrast levels full. Considering most of my collection consisted of these, I had to get rid of it.