"I was defending the screen until I saw it, I've been using 160 angle Tn display (LG) for 1½ years now (was a cheap LCD when I bought it as well).
And everything looks fine on this so I thought, This is a TN, iMac 20" is a TN, and this one is almost 2 years old, OF COURSE the iMac's screen is better.
But the truth is, iMac screens is sooo much worse than my old one, how is this possible?"
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Thanks for your post. Many have tried to act as if those who see them fading considerably from top to bottom are just seeing things, or need to calibrate it, or are viewing it from a bad angle. They refuse to believe it's not really as bad as it really is. Easier to believe all the people complaining are just idiots than that Apple put out a terrible product.
But in my last visit to Fry's the 20" there did not have the gradation problem and didn't look too bad, certainly no worse than the TN screens you can find all over town. So this was clearly a manufacturing problem that has been cleared up, although it's still hard to believe Apple would have such lousy Quality Control in place as to allow those first iMacs to ship out.
And there is still no way to tell if you are getting a good screen or a bad one without actually opening it and starting it up.
Which also means the glass in front is not the problem. I suspect Apple made it glossy so people would oooo and aaaaa and not notice how cheap the screen is. Might have worked too, if they hadn't sent out so many seriously flawed ones all around the world.