I'll try that next I still haven't taken the main chassis out to check for cold solder joints so I'll try that next.
If the video card is good try some more things.
If you remove the input signal cable to the monitor.
Monitor should display the NO SIGNAL message on the screen
and it will show the 3 primary colors on the screen if good
then it may not be the neck board..
If still missing green then like the other said solder the large white resistors
and the Video Transistor, like R234 and Q206 anytime it test bad i replace q208 also.
Check the pins and traces around Q206.. try solder on the resistor and transistor first.
Make sure the input board is solder good. Its not a cap.
But it looks like the caps are orginal and should be replace just because.
Or wait till it fails with other problems,never had a tube issue.