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Originally Posted by Ed in Tx
My old Sony 40" CCFL, I just checked, 65,535 hours since 2008 when I bought it. Has never been serviced. Only issue is the blue that I may eventually have to replace it for. It is apparently fading and I think you just confirmed what I've been seeing. I have to run the red and green all the way down to get close to a gray scale now.
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I'm not completely sure but I believe at least part of the yellowing in CCFL TVs might be a color temperature shift of the tubes themselves. It certainly isn't all of it because occasionally I'll still change a single open CCFL tube from scrap stock, and there's not a lot of difference of gray scale when viewing a white pattern in the area where the replaced CCFL tube lives. But we certainly see the yellow mange in high-hour LED back lit TVs as well.
John