High pitched buzzing

It happens with some television speakers..There seems to be excessive hiss and buzz at high volumes if its happening even at low volume then check your tv's signal reception(ask ur connection service provider for help)If this doesnt fix the problem since the product is in its warranty period just drop into a service center and they will fix it for you

Most likely this is your flyback transformer making this sound, suggest you take it in before warranty runs out.  Some of these sets only have 90 day labor warranty but have 1 year parts.