My 4-year-old Samsung T220 has been having an interesting problem lately.
On images with very dark/black backgrounds, I see flickering white pixels on the foreground parts of the image that isn't the background. Example: an image with the word TEST in red (can be any color, really), with a completely black background. The white pixels flicker in an almost snow-like effect that you see on old TV screens. In the example I gave, you would see the white pixels flickering in the word "TEST", but no problems in the black background.
Is this simply a case of an old monitor? I never had this problem until only recently. Or is this a case of the huge color contrast between the dark background and the colored text?