[quote name='omegaweapon7']wait wait, WTF dead pixs are BLACK? what the hell is the white dust thing i have then?
whats the best way to check for dead pixs?[/quote]
Someone already posted the answer, but since there seems to be a lot of confusion, here it goes again.
There are two types of LCD defects: dead pixels and stuck pixels
1) A dead pixel, as the name implies, is completely dead. No power can be sent to that pixel, so it can never turn on. It stays black no matter what. With that in mind, the easiest way to check is to display a white screen, and look for black spots.
2) A stuck pixel, is stuck on a certain color. This is because the power has been shorted to one or more of the three colors that make up the LCD pixel. These can be red, green, blue, white (if all three colors are stuck), etc. A good way to check for these pixels is to display a black screen, and see if you see any colored spots.
In either case, both of these problems occur in manufacturing. Possible causes are a dead transistor, broken metal line, etc. They are not problems that "get worse" with use, anymore than a CPU can "get worse" with use.
The problem is that when one of these faults happen in a CPU, they are very easy to check, because you just trun on the CPU and start giving it instructions. If it has a broken transistor, it will give you the wrong answer. But an LCD screen will work fine, except for that particular pixel. As far as I know, there is no easy way to automatically check for dead pixels without adding circuitry and test time, both of which cost big bucks.