Green Tint on VGA CRT Monitor Connected to Macintosh IIx

[_nec6678]

I just picked up a Gateway CRT monitor along with a Pentium 4 Gateway tower PC for four dollars total. I also got a NAD MR13 for free with no vertical deflection that I need to repair, along with a neat IBM PS/2 keyboard that was two dollars. The Gateway PC turns on for only a split second before it shuts off, but I suspect the crappy old power supply to be the issue.
When I first turned on the Gateway monitor, it displayed a floating test pattern saying my monitor was in working condition. However, there were loud clicks accompanied by the picture flickering, so I took it apart. The first thing I did was reflow the solder around the flyback and on the neck, and did a quick test. However, there was still the dreaded click, so I took off the anode cap, cleaned it with isopropyl alcohol, applied (a little to much) dielectric grease, and put it back on. I put the monitor fully back together because I knew that there wouldn't be much that I could do with the click other than that. When I turned the monitor on, the click seemed to be gone until it clicked again! After using it for a while, however, the click eventually went away.
However, the remaining issue is with a green tint on the picture when the monitor is connected to my IIx. I have an Apple DB-15 to VGA adapter that worked with a flatscreen Dell

 

[ClassicHasClass]

This sounds like a sync-on-green signal which your monitor doesn't know how to filter. There are circuits that will remove this. Myself I use an active sync-on-green converter that turns it into more typical composite sync, though these are not cheap.

Alternatively, you could try fiddling with the adapter if it has DIP switches, or you could use a different Mac video card that doesn't emit (or solely emit) S-o-G if you have one.

 

[_nec6678]

This sounds like a sync-on-green signal which your monitor doesn't know how to filter. There are circuits that will remove this. Myself I use an active sync-on-green converter that turns it into more typical composite sync, though these are not cheap.

Alternatively, you could try fiddling with the adapter if it has DIP switches, or you could use a different Mac video card that doesn't emit (or solely emit) S-o-G if you have one.

Unfortunately, my adapter doesn't have any DIP switches. Do you have any recommendations for a specific sync-on-green converter?

 

[ClassicHasClass]

The one I use is a Software Integrators #7053. They still sell these, but they are not cheap, about $140 ( https://si87.com/Shops/3738123e-8b74-40b2-bd96-ddff0f19d352/Products/7053 ). They require an active 6V power supply which is included, and work for most systems and monitors. You plug the output of your Mac adapter into the input and your monitor into the output.