Dev4PSP released an application to restore pixels of your psp screen. Normally it can only restore stuck pixels, but after 12 Hours flashing colors onscreen it can restore dead pixels.
Download: PSPPiXel Restore v1.00
Hopefully it restores some pixels for you ! :)
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I tried this out and ran if for over 12 hours and none of the pixels were fix. I can still see a huge cluster of dead/lazy pixels, when the entire set to the color black.
Has this program worked better for anyone else?