Vintage Philips 4BM2797 CRT BW monitor repair/tuneup

[mitchw]

I have a Philips 4BM2797 black and white VGA CRT monitor that is very dim. If I put the brightness at medium (indent at the pot), the text is barely visible in a moderately lit room.

I looked around for a service manual, but was unable to find one. Also there are no G2/Focus adjustments on flyback...
There is a row of adjustment trimmers, but they aren't marked..

Anyone has any info about it?
Thanks

[mitchw]

Anyways, I marked all the pots with sharpie and started turning them slightly. The one marked 3537 is clearly the G2 voltage control as I was able to crank it up so the retrace lines started to show up. This is the third one from the rear side...

Now the image is much brighter, and still very sharp. So most likely the tube is in a pretty good condition still