My mother just bought a 27 inch Toshiba tube TV. Every half hour or so she hears a popping/lknocking sound, which doesn't effect the video or audio, but is very annoying. What could be causing this problem? Will it go away or should she return the set?

honestly i have no clue what it could be but to be on the safe side so it doesnt affect u later on down the road take it back and get and exchange..when u try the new set if it does the same thing then well i guess its suppose to do that. (sometimes i heard that a loud popping in a tv is from electricity transfer to other places see if it makes thesound when a sudden flash occurs or something different) hope it helps

You should probably return it because you need a tv that has the best quality with no irregularities.