I live in a large condo building and have mounted a 42 inch Panasonic on a wall that is shared by the unit next to me. I don't play the sound loud but he complained about a loud vibration in his unit coming from my tv. I went to his unit and had to admit it was not his imagination....the bass was especially evident.
Has my installer made a mistake or is this a common problem with wall mounted tv's? Anyone have a solution to stop this vibration?

Thanks for any help.

It sounds like you need some vibration isolators. Maybe start with some rubber washers between your mount and wall and between your mount and panel. If that doesn't do the trick, you might have to step up a few notches to vibration mounts. I know McMaster-Carr has a selection of them, I'm not sure if many other direct to consumer places carry them.

Of course, if it's just you, you could also consider high quality headphones. They will likely exceed the SQ you are getting from the display.

This is a common problem in multifamily dwellings, especially those that are not high end. It is aggravated by the frequent use of a single common stud. The best solution is either to use separate floor mounted speakers, headphones or remount the panel on a piece of floor mounted furniture.

:) problem with wall mounting (the neighbors) From the title of your thread, I was thinking, "Why the hell would anyone's neighbor want to be wall mounted? I know I wouldn't!"

Unfortunately that is a common issue. Your wall is basically acting like a giant drum head. As your speakers radiate sound, part of the energy goes into shaking the wall, you want that part coupled to ground. But, the wall is not too good at that. You basically need a "path to ground" for the vibrations -or- not have the vibrations on the wall at all. You can use other speakers for sound ideally, not touching the wall and making good contact with the floor. Or you can use headphones as somebody else suggested. Lastly, keep in mind the vibration isolators, rubber washers, etc act as mechanical resistors, so the effect is lessened by some amount, but not eliminated.