If your Plasma TV makes a buzzing sound when it is turned on, this is normal. It's caused by the electrical charges that are used to power the pixels that create the images on the screen. The buzzing, however, should not be so loud that you can hear it when the volume on the TV is set at normal levels.
If your Plasma TV is buzzing loudly, follow these steps:
Set the volume of the TV to the setting you normally use.
Stand 10-15 feet away. Perform a sound test (B,C, and D series models Menu> Support> Self Diagnostic> Sound Test)If you do not hear the buzz, your Plasma TV is working normally.
If you continue to hear a loud buzz when you are 10-15 feet from the TV, return to the TV and see if any cables are resting against the metal back cover of the TV. If cables are resting against the back panel, reposition them so that they do not rest against the back panel and see if that reduces the buzzing.
If repositioning the cables does not reduce the buzzing, remove all connection cables from the TV and uplug the TV for about 30 seconds.
Plug the TV's power cord back into the power outlet in the WALL; not a power strip, and turn it on without anything connected.
Perform a sound test (B,C, and D series models Menu> Support> Self Diagnostic> Sound Test) with the volume between 15-20 and standing 10-15 feet away, can you hear the buzz over the sound test?
If you don't hear the buzzing with nothing connected and performing a sound test as instructed above in step 6, your TV is operating within specficiations. The buzzing may be caused by overly large connection cables, the cables resting on the back of the television, interferance caused from a connected device, a faulty power strip, or an echo from the enviroment. Experiment with different cables until the buzzing is no longer present, as this is not an issue with your TV.
If you can hear the buzzing with nothing connected and performing a sound test as instructed above in step 6, Lower the Brightness, Contrast, and Cell light values in the picture menu by half. Re-test using step 6 after lowering these values. If that still does resolve the buzzing, You can call 1-800-SAMSUNG or Click Here to fill out an online service request to begin the service process
Important: Plasma TVs do not operate properly at approximately 6500 feet (1950 meters) or above. If you attempt to operate a Plasma TV above or near that altitude, it will buzz very loudly. Unfortunately, there is no way to stop the buzzing at that altitude. However, the loud buzzing should stop when you operate the TV below 6500 feet.