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727 posts

Ultimate Geek
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Topic # 125706 16-Jul-2013 20:14
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Have a Panasonic 55" and noticing more and more a 'buzz' coming from the set. It varies with brightness and is worst when its first switched on. Has reached the pony where its distracting.

Does anyone welse have this, or ir is just my set ?




Cheers - Kirk

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  Reply # 857666 16-Jul-2013 20:28
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Does the buzz sound like a pony?
Sorry... couldn't resist.

Often plasmas will buzz when displaying brighter images... but if the volume is up, there's no way you should be able to hear it.

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  Reply # 857667 16-Jul-2013 20:29
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It must be bad if it is distracting your pony!

Sounds like a fault to me. Last time I had a TV that was that bad I got it replaced under warranty.




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Master Geek
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  Reply # 857677 16-Jul-2013 20:38
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ADKM: Have a Panasonic 55" and noticing more and more a 'buzz' coming from the set. It varies with brightness


I use a Panasonic 50" 2010 Plasma.  When it was new, it generated nearly no buzz I could hear.  Now it buzzes noticeably louder than before, especially when showing the Windows 7 desktop or browser from my HTPC.  My understanding is that plasma buzz is normal, but there are people who found interesting fixes:
http://www.avforums.com/forums/plasma-tvs/878642-panasonic-plasma-buzz-fix.html

One more thing: many Panasonic plasma TVs have fan(s) inside which may also generate noise, although the one I own is fanless.  Perhaps you should try to determine whether the noise is fan noise or plasma buzz.




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Ultimate Geek
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  Reply # 857755 16-Jul-2013 22:52
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Hmmmm interesting link. But I don't feel like pulling it to bits. Wish I hadn't bought a Panasonic but thought they were the best!! Buzz is mostly borderline but you can now hear it under the dialogue.




Cheers - Kirk



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  Reply # 857790 16-Jul-2013 23:54
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If you mean, are contrast or brilliance up full - no.




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  Reply # 857875 17-Jul-2013 08:58
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ADKM: If you mean, are contrast or brilliance up full - no.

I think he actually means, have you read what you posted in the subject line and your original post?
Incorrect spelling can change the whole meaning of what you write.

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  Reply # 857892 17-Jul-2013 09:16
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Check that the vents are clear of dust and obstructions. Don't use your set on the default dynamic display setting this uses more power, generates more heat and will shorten life cycle. The dynamic is there for show room demo only.




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Master Geek
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  Reply # 857894 17-Jul-2013 09:21
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Check that you are not controlling the volume on a MySky or PVR, and that the volume on the TV is not set to maximum.

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  Reply # 857917 17-Jul-2013 10:08
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I have a Panasonic plasma that made so loud buzzing.  It would come and go, but sure was annoying at times.  Moved the TV to another room and it stopped.

Currently have a 65" in the original room and boy are it's fans loud.  On quiet scenes you hear a constant hum.  Using a slimline bracket with it so not sure if being closer to the wall makes it louder.



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  Reply # 857988 17-Jul-2013 12:12
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Hi Bigglz, I get it now... typo... wondered what the reference to ponys was... LOL

It's not on dynamic, there's plenty of clearance and the audio is taken via its line out to a seperate amp. TV vol is on minimum. I'll check for dust though... and move it a few inches. Then prob just have to grin and bear it. Yes on quiet scenes you can certainly notice it and it's loudest when first turned on. Model No. is TH-P55T30Z. Haven't noticed a fan but it may have one... when anything fades to black, it goes perfectly quiet - then whammo - back with the picture.





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  Reply # 858017 17-Jul-2013 13:24
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I've heard of this and ntoiced a buzzing on my 65" ST50, especially with a full white screen. Like the OP, I don't know what's "normal" so not sure if it's worth bringing up with the store/manufacturer.

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  Reply # 858396 18-Jul-2013 00:28
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ADKM: Model No. is TH-P55T30Z.


You're missing a letter here between the '5' and the 'T'.
If its a 55" ST30, then it doesn't have fans.

Plasma buzz (on high contrast scenes) is normal. They all do it. What isn't normal is being able to hear it from your seat.

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  Reply # 858397 18-Jul-2013 00:43
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How bad is normal plasma buzz? It is something that could keep me from buying the P50ST60 - especially if it can get annoying.




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  Reply # 858426 18-Jul-2013 08:46
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I have a base model 50 incher Ponisonic Plasma and it buzzes from behind top left corner (looking normally from front on). Always has and it varies in pitch based on the white level "brightness" on the screen at any one time. Assuming more power required for full brightness of a plasma screen, I've assumed it's related to the power supply.

It's definitely not fan related, it's real and it's annoying, but potentially only in very low volume scenes that you'd be able to pick it from 4 meters away etc.

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  Reply # 858431 18-Jul-2013 09:05
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Its a tade off. And as pointed out all Plasmas do it, its the pitch and audible noticability that varies. Sometimes even between different peoples perspectives.

For the nice picture on the Panasonic neoplasmas, I'm happier just cranking up the home theatre that bit more to drown it :) Of course there is nothing you can do in quiet bright scenes. But meh

Certainly more noticable from an edge-on perspective. I could hear it more when seated at the PC on the side of the room more than frontal.

Those icky white based adverts or high-amount-of-white screens make it squeal something chronic. Then, anyone would squeal with a good few hundered volts up their backsides.

I get 2 different noises on my ST50. Presumably one of them is the trade off for having all the greenys demand eco power saving features - later model like the xx50 range have no fans but rated 5 1/5* evergy saving.. there has to be a trade off there for some large caps or transformers (which buzz on a good day) to produce the voltage/current to excite those plasma molecules something into submission

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