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A common cause are failure of decopling capacitors in the audio section, and or the circuit board power distribution that feeds the audio board. Most of the capacitors are surface mount components. The standard fix is to start by changing the circuit boards that have the defective parts.
If the set is under warranty, call for warranty service. Out of warranty service is expensive for these TV sets.
I have this tv aswell, and yes I will confirm that it does buzz quite alot, but all plasma tvs do, it is to do with how it renders images, the buzzing can be made worse by it being close to a wall and it reflecting back. I found that my tv stand some how amplified the buzzing when i got mine. I dont think its something you can escape.
Mine i notice also when scrolling around menus seems to have lines that follow your selection....not to pleased about that
Hi there! If it is an anoying sound I would personally have it checked if still under warranty. It may be a bad coil or transformer in the power supply. Enjoy what you paid for rather than sitting with a fault that might cost you extra later on. Best Wishes and Good Luck, JUS004
It could be the inverter board going bad. The inverter board is what makes the back lights come on and has transformers on it that have high voltage. any time you have a noise like a buzzing or arcing you should have it checked