I just picked up a used Sony CPD-G520P monitor and noticed that it seems to have a problem similar to another Trinitron (an HP) I had where in certain places on the screen, vertical lines seem blurred.
It's most obvious at higher brightness levels, but I don't think it's*caused* by high brightness, but just evident. You can really notice the effect when reading text at 1600x1200 -- a few words will be super sharp and clear, but then the next few words will be blurred out a little, and then further along the same line, it will clear up again. If I'm looking at a page full of text, the blurriness seems to zigzag up and down across the screen.
When I started writing this I was wondering if there was maybe an alignment adjustment for the monitor that affected the alignment of the beam between the lines of the aperture grille. But I'm wondering now after doing some adjustment of the convergence if that is the underlying cause. I've noticed that the convergence left-to-right is not the same at the top of the screen as it is at the bottom.. and as I adjust the convergence left to right, the effect of the blurriness seems to vary quite a bit.
I guess focus and convergence are closely related settings anyway so probably tweaking either one one way or the other could improve the clarity.
Any thoughts on this? I wonder if there's a service menu on this monitor that will let me "straighten" the convergence vertically.. if the monitor wasn't still under warranty I'd be tempted to open it up and look for some adjustments inside.