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you have working sync. nothing there will make a difference. you need to adjust V. Size if the picture is getting cut off, then V. Center to reposition it
your picture of the deflection board, there's a blue SUB V. SIZE pot in the middle. I wonder what that does?I squeezed the image. Not sure why not all of the image is being displayed. That seems to be part of the problem.
View attachment 792622
your picture of the deflection board, there's a blue SUB V. SIZE pot in the middle. I wonder what that does?
also I can't tell if those caps are original or not. if they are (you can look at the solder underneath) then I would strongly encourage sourcing a cap kit from APAR. Neotecs are a total grey area for monitors because they have variations even between the same model. there will be caps that are used and others that aren't. if those locations are empty you leave them empty, you don't add caps where they're not needed.
Looking for a repair manual for a specific model is fine, but it's like buying the manual set the timing on a 1989 VW Rabbit. Useful once, and teaches you how to do something on that one car, but it doesn't teach you how what timing is, why it's important, or how to set it on the majority of vehicles. Not to mention most stuff in this hobby does not have a manual much less a repair manual.Neotec seems to have gone away and I can't find a manual or repair manual for this chassis, so I feel like I'm playing darts with a blindfold on.
Looking for a repair manual for a specific model is fine, but it's like buying the manual set the timing on a 1989 VW Rabbit. Useful once, and teaches you how to do something on that one car, but it doesn't teach you how what timing is, why it's important, or how to set it on the majority of vehicles. Not to mention most stuff in this hobby does not have a manual much less a repair manual.
I'd suggest starting with the basics if you're really interested in learning to fix CRTs and look up the Randy Fromm books. If you just want to fix this one, that's one thing, but if you want to stop feeling like you're playing darts, it may do you well to learn how they work to start.
There's also a really lovely, free, text-only site somewhere that has most of the basics of how a CRT operates and how to address most issues (in a general sense). It's a few hundred pages long, but I cannot remember the name of it to save my life right now.
As @mecha suggested, did you try adjusting the sub V size and/or V-line pot? I can't tell from the picture what that third pot is for, but I'd assume it has something to do with vertical since it's in the same section.

yeah that looks like a vertical linearity adjustment? that could have something to do with it too except it doesn't look stretched on the opposite side.@mecha is referring to this one:
View attachment 792921
There's also one immediately to the right of that @chilibear13 mentioned