Hantaren mtc 900 arcade monitor problem

Hi!

Has anyone seen this problem before:

I flipped the horisontal deflection wires, and the dark area flippes also, meaning that the CRT tube is not the problem. I also changes all the caps in the monitor, except the large 250v/330uf in the ps board, which I somehow missed.

On high brightness items, the darkness is hardly visible, like the "button 1 for next screen" text that looks allmost normal - where backgrounds sometimes becomes allmost black.

Any help would be appreciated.

Regards Brian