I have a LG flat screen lcd TV held against the wall but it is too noisy.

What is the solution? A wireless sound bar?

A wireless sound bar is nice, but you need to make sure that your TV supports wireless (i.e. through Bluetooth). Fortunately most sound bar comes with an aux in, so you could get a sound bar and get it connected to the TV with an audio cable.

Souce: Sound Bar Reviews | The Best of Home Entertainment