my TV-monitor is now about 4 years old, and it's only about 6 months ago that i realized some settings had changed, because of component aging.
i had to adjust image "position" upwards by 3 notches to center it,
and black level had to be decreased by 1 notch, to bring the image to the way it was before.

it is a slow but continuing process.

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery