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Most TFT producers have a dead pixel threshold of at least 4 sub-pixels (Iiyama), going up to 8 or 10 for less friendly companies. It really depends on the location of the pixel, and the nature. Is it a dead sub-pixel (red, green or blue), or is it a complete pixel (white/black = 3 sub-pixels)? Is it in the corner, or near the center of the screen?
We, as a computer shop, have a zero-dead-pixel policy within eight days - if you find one, you can get a new screen. We then cannot send them back, and have to sell them at a discount. Basically, it costs us money (lots of it). When Samsung takes them back, they can't do anything with them but throw them away, costing them lots and lots of money.
So, the advice firebirdta gives isn't quite as nice as it sounds. It's worth a shot, because the pixel might be a warranty case (if it's *really* annoying), but it probably isn't. Why should Samsung have to pay for your quest for perfection? That simply means higher prices for their other customers... If you want perfection, you'd better pay for perfection; 450 Dollars is a lot of money, but not for TFT screens!
On a brighter note, we had a batch of Samsung TFTs with loads and loads of dead pixels (50 to 60% had at least one), and we finally managed to persuade them to take them back. We're lucky we're powerful enough to force them to do that, because most smaller shops can't possibly do this.
Oh, and whatever you do: DO NOT MAKE YOUR OWN DEAD PIXELS! They can see that right away, and you'll be slapped with the "user abuse" warranty policy...
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