Hantarex MTC 9000 really dark after disassembly and cleaning

[lazercountach]

Greetings! So I disassembled my working Hantarex MTC 9000 for cleaning, meaning I disconnected the chassis and neck board. When I put everything back together, I had no picture at all. Playing around with the contrast pot on the chassis, I got color blue showing normally, but no red or green. Then I played around with the RGB gain and cutoff on the neck board, and I got all colors showing properly, but the screen is really dark. If I turn up the contrast, I can get the screen to a proper brightness, but the colors bleed horizontally like crazy. What could be the problem?

[grantspain]

does the sub brightness pot work?

[lazercountach]

In addition to the brightness adjustment on the flyback, there's a pot labeled "brightness preset" on the chassis. It seems to work, and it was already turned up to max brightness.

[baritonomarchetto]

Is the neckboard well inserted? If the brightness was at good levels before the cleaning operation, the CRT itself is ok and not on it's last leg.
Check all the connectors and take a good look at the chassis itself