The catch is that there are no LCD RP's 5+ years old, so there is no objective answer to how many pixel failures there will be. Based on discussions in this forum, I would say that pixels can fail during use but most bad pixels will arrive that way from the store. I've read nothing to suggest that pixels will fail regularly as a function of time.
If you are concerned, getting an extended warranty can be reassuring. In theory, DLP sets are also less likely to have a pixel failure problem. Again, there is little historical data to consider.
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