Really?
I've never taken apart a large LCD TV, but now I must ask if they put metal weights or something in them, because to mount and dismount the 42" off my wall, I have to have my wife's help; I wouldn't say because of weight, but more because of awkwardness. I always figured the panel and associated glass inside was the main reason for the weight it did have (which isn't small). I was also figuring that the panel by itself might need to be handled more carefully and with a more even pressure to prevent damage. (though I am sure like smaller LCD panels in computer monitors and laptops, which I do have a small bit of experience in fixing, there are metal frame "bezels" around the edge).
If you say so though, I'll believe you - I always figured that once you got past a certain size, other precautions were needed. Interesting to know...