Running out of ideas and really looking for some help on this monitor. Original problem was missing colors, don't remember which ones. Anyhow, after a cap kit, still had same issue so I ordered the neckboard transistors after verifying that the passive components on the neckboard were good. Once I finally got the transistors, I hooked the monitor back up to see which colors were missing and got no video at all. Went ahead and replaced the transistors (2) anyways but same issue. Turning up the screen control, I do have raster lines and the B+ is at 130v. So, following Fromm's Flowcharts, I replaced Q4 and Q7, with no effect. Reflowed the video connector and the blue/white harnesses.
When I turn up the screen control, the raster lines are there but I don't see the game playing at all. I hooked up another monitor to the test rig and it worked fine. This is the 27K7391 with the pincushion adjustment board. Board is a P538. No amount of fiddling with the screen adjustments produces an image.
Thanks in advance