As long as the brick wall doesn't get too hot and you keep the smoke and all IN the chimney, I'd say it wouldn't be any worse than keeping a mantle over your fireplace with important pictures and stuff. But you'd have to anchor the bolts into the masonry probably and they're very LONG bolts.. i'm really not the person to ask i just thought i'd say what I thought. Also - Having light anywhere around the tv screen is going to mess with your eyes while you're trying to watch it, and if any kind of light is hitting an lcd screen it's going to wash out and darken and be hard to see.
I want to put my new LCD over my fireplace. I see that done in photos and such and it looks great!! In reality, is that a good place for it?? What about the heat from the burning wood?? Also, how in the HECK do you hide ALL those power cords,cables and wires from the Sat. rec. and the surround sound equipment leading to it?? The back of my present TV wall unit has cables and wires running everwhere !!!!! Thanks !!!