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Has anyone actually repaired their screen with it? For me, it just didn't work; after four hours or so, I simply gave up. (Sony LCD screen, really high-quality, a few stuck pixels in a specific area)

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Are they stuck or dead pixels? My understanding is that if a pixel always appears black, it's "dead" and there's no help with that.

I got few pixels unstuck by using similar apps and massaging the screen, but recently I got one black pixel which doesn't react to anything.

Yes, mine are a few black pixels (Lenovo laptop screen). Didn't work for that.

I left it on overnight once. It worked. The pixel re-stuck several times after so it took a few more sessions. It's been normal going on a few years. You might try rubbing the pixel area a bit and testing other stuck pixel fixing software.

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