I'd prob just get a refund from apple. You will never be happy. I saw your pics. I dont see horrible yellow tint on your first pic at all. As a matter of fact it looks pretty good to me. You wrote the following:
My 4th replacement is a week 6 and it too has a yellow tint and other problems.
1) Dead Pixels
2) Yellow Tint
3) Horrible Backlight Bleed
4) Dark horizontal band running through bottom of display
Dead pixels...I dont have it, or if I do they are tiny.
Yellow tint - mine very slight. If you go to the display configuration you can cool it down somewhat..but what you get is a bluish white tone. Take your pick, it will never be pure white. Both my last two have a faint black horizontal band towards the bottom you see it on a pure light screen. Since i had two diff machines, I believe they all have it. It doesnt appear once your in the OS, only mostly on booting into the mac. Mine has some yellow backlight bleed. I only see it when Im booting into bootcamp win 7. before operating system comes up I see light shining thru the black. I've tried to play mass effect 2 on it and its kind of horrible, the lighting. The blacks arent black, it has the LCD effect of light coming thru, thats the nature of this monitor. My point is that these imac's will not be 100 per cent. If you've gone thru 4, your not going to ever be happy is my point.