I wonder if this is common?

I've Nikon D5100

When I switch to live view. If I keep my ears near my camera I experienced some kind of sound, very low sound. If you switch TV then there'll be some slight sound know like that.

I feel that sound from my camera only when place is clam! Of if my ears go near camera. (Only during live view mode, I mean when lcd is showing live view)

Is my camera normal?

is this sound is due to lcd? Like all tv do.

I can't speak for others, but when I put my Nikon D90 in Live View, I hear no sound in a quiet room even if I put it Record mode. If this concerns you, I'd contact Nikon about it, otherwise, I'd just ignore it.