Nope, Nintendo warranty doesn't cover this. Read the instruction manual page 74, Note 8.

-> High-precision technology is involved in manufacturing LCD screens, even so there may be some pixels that are always on and some that do not go on (dead pixel). This is not a defect, but the current state of the art and is not covered under any warranty

Should be careful next time to check the whole aspect before buying it.

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Added on April 22, 2007, 4:30 pmBtw, if the store owner (whom you purchase your NDS with) are compassionate enough in your case, he might offer his service for free.

This post has been edited by D.Sync: Apr 22 2007, 04:30 PM

Well, if you see the dead pixel, you certainly did! No one knows your NDSL better than you right? Try and play games that switching screens continuously, such as Pokemon Diamond/Pearl.

-> Enter inside and outside a house, it will constantly switching the screen between BLACK and graphical images. Try and notice if there's anything unusual.