I've had the 'pleasure' of hanging 32 27" sony's at various locations in the downtown bar/resteraunt district where the brick was so old and soft, you could scratch it with you fingrnail.! The Hilti man came through with an allthread,epoxy system that worked great(so far.knock wood).

I've seen those. They are pretty good but expensive.

So the anchors go into the bricks themselves, or the mortar between the bricks?

I suppose you use more anchors than if you were attaching to 2 x 4 studs?

This system ROCKS!! had an home built in the 20's with very soft brick (fireplace) and it worked like a charm. Hung a 50" Fujitsu plasma no problem.

either.

BUT if your drill wobbles on these, they will also lose effectiveness. They have low and high threads, and they depend on the high threads cutting into the masonry and providing powder, plus a tiny depth of thread, to hold the screw in place.

This is NOT my choice where the weight is in the direction of pulling out the screw, though! There I would use, I believe it is called, a Red Head. There are many models of Red Heads, but the ones I am talking about have a sleeve expands as the bolt is drawn tight, meaning that pull-out will TIGHTEN them. Since the holes for these are generally 1/2" or larger, there are no issues with drills wobbling. A bent 1/2" drill will not wobble, it will break your arm. So no problem.

I would not use tapcons for that much load, way to much liability for my taste. I have had a few of tapcons sheer off when tightening them with my drill. That tells me that they are not hardened, so even if they hold to the brick they may sheer under the weight of your load. I like lead anchors.