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Edge-Lit, Thin LCD TVs Are Having Early Heat Death Issues
(hackaday.com)
This is a most excellent place for technology news and articles.
You do not mount a tv over a fireplace. The heat from it will warp the tv.
Mine's been mounted over my fireplace for years without warping.
this message sponsored by your local chiropractor
Chiropractors are quacks and looking up slightly at a TV isn't bad.
Instead, mount the fireplace DVD:
[https://www.flickr.com/photos/92514650@N00/338467522](Image source)