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I've been seeing a lot of cheap LCD sets with bad LED backlights, so I've got my doubts that they'll last longer than CCFL backlights. These have all been under 3 years old (some only just outside of warranty). In these sets the backlight is one string of LEDs in series, so when one fails open the whole panel goes dark. I've yet to attempt to repair the backlight itself. I get enough of these sets with cracked LCDs that I just swap the entire backlight.
I've got quite a few 10+ year old panels with CCFL backlights that are still going strong (though I do have a stash of replacement inverter transformers for a couple that I'm particularly fond of).
LED failures aren't restricted to TV backlights. I was in a building recently full of those 3 LED downlights and every room had at least one out.
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