Methinks stuck is a better term... dead is referred to LCD as it is somewhat organic in nature, whereas mirrors are mechanical...
I'm more familiar with dead/bright pixels on LCD... whilst working 3 out of every LCD that came through had a dead pixel or more. Most everyone walking in the store didn't spot them, neither did my coworkers... I didn't have to look hard, just noticed it off the bat (they called me a dead pixel detector... bip.... bip.... bip-bip-bip-bip!)
The problem of stuck mirrors on DLP is nowhere near as common, and as I've never seen one, I've no idea how noticeable it will be. My guess is that given the lower res for same money, it might be more noticeable, whilst at the same time being a "smoother" picture it might be just as elusive. The 260K I have at home doesn't have any. I've not seen any DLP's on display that had stuck pixels either, but DLPs on display are rarer than LCD's on display so there is that numbers game.
Well so far I'm 1 for 1 on getting a projector with a dead pixel/stuck mirror. I bought an X1 from an online store I found on pricegrabber. They advertised it as new but when I got the stupid thing it had RE stamped all over the box. When I set it up I checked the bulb usage and it had 29 hours on it! Called the worthless seller back and low and behold "it should have been advertised as refurbed" and then they offered me $100 to keep it. B---S--- I said. The piece of junk is going back on their dime. I don't know how common it is but it defenitely is noticable on the X1. Just a black dot on the screen. I wish the X1 was still in stores.
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