adt0330,

I would suggest, since it's in warranty, that you get a service technician to take a look. I'm not sure what is buzzing or why that issue is happening.

Regardless, if it's coming out of the speakers of the television and those speakers are muted, it seems to be a covered problem and more than likely may be a relatively easy fix.

Why not give 800-SAMSUNG a call to have a service tech take a look?

--HDTech