Having a big problem here. I have an almost-new Samsung 955DF which has been giving me problems since day one.
The monitor initially had a huge brown patch in the center of the screen, almost like dirt. Increasing brightness/contrast did nothing for the picture. In addition focus was very poor, there was a lot of bloom and reflections. The service center said they replaced the CRT.
Now, it is unable to reproduce black. Everything has a reddish cast to it, apparent even at the lowest brightness setting. Even when Windows boots, the initial screen has a reddish tinge to it, which grows more and more prominent as the monitor warms up. After a few hours it is unusable. Since black is not coming correctly, everything looks blurred and indistinct. Using Adobe gamma helps a bit, but in 3D mode the problem starts again, and besides the red never does really become black. The only time when it is not apparent is under very strong light, such as the middle of the afternoon with all windows open (as in doors/windows, not Windows XP et al).
In addition the focus is really poor, and when switching colour areas (for example viewing a Ferrari and quickly closing the window) all fonts get badly blurred for a few seconds before coming back into their poor focus (though I think the focus is related actually to the colour issue).
I have some electronics experience, and have adjusted TVs before for such anomalies, and so opened up the monitor (I don't trust technicians who give back half-repaired products) to adjust the colour strength. I can see only one pot, which sets the screen horizontal center. Even the CRT board has no controls.
The only other controls visible to me the the ones on the flyback transformer, which I am not going to touch. Any ideas, apart from giving it back to the giuys who always seem to tell me the monitor is working fine when it isn't (that is the real issue)?