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Re: TV EMITTING A BUZZ NOISE
You have a cracked Plasma panel. If u remove the back cover of TV and look in the top left of the plasma panel u will see a small round cylinder tube with glass tip inside. Look with a flashlight and u might see the crack. OH the buzzing noise is from the current going through the panel just not ignition the gases inside the panel to light the phospher cells. Hope this helps.
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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
Have the outlet checked by a qualified electrician. Sounds like either a power issue or ground. You should not get a buzz from an outlet for any reason.
If you plug something else into the outlet does it make the same noise?
If yes, something going on with the power. If not, then the TV power supply might be doing it, but the noise would be behind the TV and not the outlet.
It is possible there is physical leakage from inside the set to the exposed metal on the set===a test from ground to the chassis should reveal this==we use a leakage tester for this which will measure even a tiny amount.
You are dealing with a failing backlight inverter. You are hearing the surface mount components failing over time and that buzz is them not keeping up with the voltage coming into them. (Hz) You will need to open the tv and locate the noise and replace the backlight inverter :)
plasma tvs buzz a lot, depending on screen brightness. its probably normal but if you can hear loudly over your volume, may be a bad board or plasma panel. from behind tv, left side = y board, right side = z board, middle = power board ---- bad panel can buzz from anywhere... if you hear all parts buzzing, its probably normal plasma noise
a smell from a plasma is usually a electrolytic capacitor leaking. Luckily, replacing capacitors is very easy. you can do it yourself if you have any skills at all, and if you can identify it.
just google what i am saying, you should be able to find the info you need to replace them.
be certain its not your cable providing the noise by being ungrounded .or interference from some other device connected or around tv. disconnect everything except the cable. turn off all dimmer lighting around tv. try now. are you using a cable box, if so bypass ,plug cable directly into tv. try sound again. then remove cable and plug in dvd or vcr. and try audio now. if it continues no matter, its a warranty repair or just use external speakers ,cable boxes can control the audio to ext speakers.
I have the same problem I can hear buzzing over the volume of the tv into the 30 range. I've had a tech out 3 times and he's coming out for a fourth. He's changed to power supplies and is bringing the 3rd next visit. From what I've read it has either to do with power supplies or grounding strips.
I purchased a poloroid tv 3732 in may of 2005 from circuit city, after about 14 months the set began making a clacking sound and humming sound that gets so loud it is unbareable. I have to turn the set off. I have found out I am not the only one with this problem that has a poloroid tv. I had a technician at my home that told me there is a service warranty on these sets because the wrong part was used and the part needs to be replaced.