There is a loud buzzing sound, like a weed whacker trimming grass, coming out of the TV. It started suddenly when I turned it on 2 days ago; this has not happened before. How do you get rid of the buzzing?

U can't the buzzing noises are comming from the tv power supply board itself have some short of problems on it high voltage transformers parts,not easy to get rid of,must know how to troubleshoot and replaced electronic components parts to fixed it.The simpliest way just do a replacement of the whole power supply board,that the board where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.