Buzzing there is a loud buzzing noise coming from the back of the tv when you turn it on and you have to unplug it to stop

Unplug the set and do not plug back into power until see is opened and examined. It says Mitsubishi here but what is the model number as it is not indicated here.

This tv unit have a colors wheel design into it.This tv problems,having loud squeling,buzzing noises or colors pictures are flashes black&white with the pictures.The tv colors wheel it is worn out and it is dying.The tv have a loud buzzing noises because the tv colors wheel it is worn out and warping out of it axis and it is spinning and hitting it steal frame box.The tv colors wheel sit way back of the tv behind many mechanical parts.Have no experience in mechanical works like take things aparts and putting it back again.Hire a tv tech. to change the colors wheel.

Usually this noise is the result of a bad cable. Unplug to see if noise goes away. If so, try different cables.Has solved that problem for me several times over the years.

sounds like a color wheel problem, I can send you a DIY File with pictures if you wish. Contact me at techman32K@ yahoo.com. Good Luck!!
techman

buzzing noise is cause by small electrical arc inside the unit or a problem in your audio circuit.if you can open the unit up and check if its an electrical arc.

try replacing av cords..if not replace tv

I blew condensed air through the ventilation holes in the back of the TV, which greatly reduced the buzzing noise.

It sounds like a bad internal connection or a component failing. If the picture still is very good take it to a known good repair shop.

Please see http://www.fixya.com/support/t1011937-transformers. It sounds like your flyback transformer is not properly soldered down/is failing.

Is the buzzing coming from the back of the TV, staying loud even when the volume is turned all the way down, or is it coming from the speakers?