It is common for Aperture Grille monitors to have some geometric distortion that the on-screen controls can't fix. The most common is vertical pincushioning where horzontal lines appear bowed or the corners bend out and look funny. I learned that one way they adjust this in the factory is to glue little magnets or rotate little magnets on guides inside the monitor by hand to adjust the picture geometry. Dangerous high voltage exists inside so don't open your monitor unless you are trained to work inside. I didn't open mine at all but found an external-only solution.
To make a long story short, I mostly eliminated this bent corner effect on a 21" Trinitron by wiring tiny high power magnets to the OUTSIDE of the monitor to bend the lines straighter. It looks much better and didn't seem to hurt convergence or mess up the display very much at all. It took a lot of experimenting to find where to place the magnets though. Some places it can mess up the screen. I used the magnets from a dead hard drive but any tiny high power magnet should work (especially rare earth types like samarium cobalt magnets).
I would advice you NOT to open your monitor and put the magnets inside because of dangerous high voltage in there. That's why I placed mine outside the monitor case.
To make a long story short, I mostly eliminated this bent corner effect on a 21" Trinitron by wiring tiny high power magnets to the OUTSIDE of the monitor to bend the lines straighter. It looks much better and didn't seem to hurt convergence or mess up the display very much at all. It took a lot of experimenting to find where to place the magnets though. Some places it can mess up the screen. I used the magnets from a dead hard drive but any tiny high power magnet should work (especially rare earth types like samarium cobalt magnets).
I would advice you NOT to open your monitor and put the magnets inside because of dangerous high voltage in there. That's why I placed mine outside the monitor case.
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