Panasonic 42 inch G25 buzzing issue - Page 5

So have they reduced the white screen buzz?

picked up the tv. the buzz is still there, but reduced by a lot. i pretty much have to stand behind the tv to hear it now. i am ok with that, for now. i will let you guys know how i feel after having it for a little bit. i had a chance to look at the service bulletin or "repair hint" as it was called by panasonic. i asked for a copy, but they did not give me one. the repair is basically a silicone seal that was gunked on to certain type of component in a few places behind the tv. the component looks like coiled copper wire. these coils are basically covered in this grey silicone stuff. i am guessing that the buzzing was caused by a mechanical vibration because of these particular coils. if i feel a little frisky i will take the back panel of and look at it some more. hope this helps a little.

check out this thread there are a lot of ideas. one guy put carpet behind the tv and is totally happy.

http://www.avforums.com/forums/plasm...zzing-fix.html

The silicone on the coils is the standard "fix" for buzzing but I have never heard of it actually working.

The buzz on my TV is coming from the glass, not the back, theres a hum from the back but its not nearly as bad as the buzz that shoots out in a straight line from the front. I will try putting towels or a coat over the rear just to see if that does anything but I doubt it. The only fix for the buzz was putting cardboard in front of the TV which stopped it completely.

I really hope panasonic is paying out the nose in returns for removing the extra layer of sound dampening glass on the front.

The buzz is coming from the back and through the glass.

putting a blanket on the back of the tv did nothing, its noisy back there but its the sound coming through the glass that is what I can hear on the couch

same as you idivide. just throwing it out there. i'm a lurker on the g20/25 forums. i'll probably never let it go. its just interesting how many people have this problem. and how many describe in such a scary similar way. back buzz. front line mega buzz. i do *not* sit in front of the tv. I sit off to the side.

some models have the buzz but mine doesnt. its a very very low buzz if i put my ear right next to the tv.

my buzz comes from the back. there is no perceivable buzz to me coming through the fron glass. i guess this buzzing thing is a multilayered issue for panasonic. class action lawsuit anyone?

like i said, the silicone "fix" only reduced the buzz for me. it got it down to a tolerable level. watched inception last night and the only thing i noticed was the the other panasonic plasma "feature" (besides the installed buzzers in the back): floating blacks. thats a whole other thread tho.

i just dont want to hear or notice the buzzing while i am watching a movie or playing games while sitting on my couch. i have that now.

I wonder if someone without the buzzing could post a video of their Panasonic read-end? This way, we could compare the buzzing set with a "silent" one.

jamor, I send you a PM too, but is your set still buzz free. Your buzzing went away with somewhere between 100 and 200 hours of use. Wanted to see if you were still buzz free. I'm gonna check where I am at in hours with this second set.
Considering trying to have the 2nd set serviced *again* to see if anything happens. Maybe I could have them replace all three boards.
I *might* even go in with my own silicone. I can't stand it anymore.
I *really* need to figure this out.

http://www.amazon.com/Panamax-MFP-40...627137&sr=1-10

Gonna spring on this. 75% off a Panamax power conditioner. Its the brand lots of the more advanced users use here on AVS.

Would it be the same as the Phillips issue?

The voltage to the backlight tubes caused them to buzz. Fix was to turn down the voltage?
It changed with contrast and related scene changes.

Bazzle

Ordered this.

http://www.amazon.com/Panamax-MFP-40...627137&sr=1-10

Report back soon on whether or not a 200$ "power conditioner" can quell the buzz. I'm guessing probably not.

I just got my 42G25, and i really like it so far. I do notice the slight buzzing coming from the back when my volume is turned down, but it is not a deal breaker or anything. But the second after i power the panel off, it makes a sound like that of a laser blaster or shield charge from Halo or something. Is this normal? It sounds pretty cool actually, but my PZ80U never makes any sounds like that when turning off, other than the normal click.

The Belkin I picked up did not lower the buzzing noticeably for me. Then again, the buzzing on my P42g20 is not bad.

Got it. Plugged it in. No change in buzzing. Now contemplating calling Panasonic *again* for service again.

I had my heart set on one of the new g-series from 2010 (particularly the 54-g25) but didn't really have the extra cash and with so many buzzing reports I'm kind of glad I went the 54-S2 which is very silent.

My only gripe is those damn floating blacks, but the G-series have these too, right?

Yes they do for sure. It's a "feature"

Did a test. Now positive there is a buzz out the front center of the telvision. How do I know? Hold a blanket up to the *front* of the tv. Directional buzz disappears. Now that doesn't sound like reverb to me.

In a pickle now as Panasonic has offered to replace all three boards for me or I can just return it.

90 day return is up in ~ 30 days, but Panasonic offered to replace all three boards in the television. Order and replacing those boards will most likely take more than 30 days. Get my money back or try to fix it. uhg. i'm only 75 hours into this one, so I'm gonna break it in till 150. i've tried everything else, maybe i'll be a jamor. most likely new boards won't fix it, or at least the two scanning boards. but it always could be the power supply, thats certainly where the directional buzz is emanating from out the front of the television.

RETURN IT! replacing the boards will do nothing!. i got my tv back with buzzing just as bad. some even report that it has increased with the new boards on.

my friend jokes that the installed buzzer on the television is a feature meant to inform you of your relative power consumption.

MY FINAL "SOLUTION" TO THE BUZZING ISSUE.

i bought 3sq ft of high freq sound absorbing material from elemental designs audio. one side is a porus foam and the other an adhesive. i cut it to the sizes that i needed and glued the on the inside of the back pannel everywhere there is no ventilation holes. my theory is that this reduced the amount of buzzing that is bouncing around in there and out of the tv. my tv is watchable now. i can still hear it if i go behind the tv but no longer from my couch.

now what to do about those pesky floating blacks?

Goosefraba:

Did you have the directional buzz out the front of the TV, or was it strictly off the back? three posts! up! his is strictly from the back. Lucky.

on your set did they replace the main power power or the two x/y boards, or all three?

also, please let us know how your solution goes. if it is in fact a long term reliable solution. in pc's the use of sound isolation padding similar to your setup is widely used for silent pc use.

I just got a 42GT25, and mine does the exact same thing when I power on or off. It's like a real quiet but real high pitched whine. This isn't normal is it? I'd imagine if it was I would've read more people mentioning it (long time lurker).

My set also buzzes. Its really noticeable sitting 6-8 feet away, especially during quiet scenes. Any correlation between sets that do this and buzzing compared to sets that don't?

Frankly. I'm probably one of AVS most annoying users in regard to this issue. I'm also quite close to returning this television to Costco.

I for the LIFE of me cannot find a correlation between buzzing sets and non buzzing ones.

Closest I can get is the variable sensitivity of the user's ear & the environment you put the television in & where you sit. Like I reported in the G25 set, moving the set to a heavily carpeted couched environment and sitting out of direction center, I had a very hard time hearing it buzz.

If you look at the review at CNET they mention buzzing. Look at the Plasma versus LCD as lcdbuyingguide. Mentions buzzing.

As for the whine at startup.....i don't quite have that....i don't think. However I know my television buzzes *all* the time, even when the set has no input. Then it changes depending on content, quite strangely. Along with a fierce front directional buzz out the front of the television. Combine this with a echoic wooden room and you've got serious problems.

I'd love to fix it but have been unable to find any concrete evidence on the fix. New boards are more miss than hit I'm afraid.

EDIT:

Another test. Put a layer of mattress foam behind the entire TV. Reduced off axis buzzing by a large amount to *near* unnoticeable levels. However, on axis center/center viewing still had a fierce buzz at 10'. Room acoustics and having a wall directly behind the television will make a large impact on buzzing.


Taken directly out of VT25 (the best HDTV of 2010) thread. does that sound familiar? yes.

^^^ I appreciate the feedback Marie.

As far as the whiny noise goes when you power on and off, I think you'd definitely notice it if you have it. it's not super loud, but very high pitch. like the kind that doesnt sound good for your ears. Im sure the technology in plasmas differ from lcds in alot of ways, but I dont believe I've ever heard any TV sound like its charging a laser cannon when you turn it on or off.

Concerning your buzzing issues, I can definitely relate. like you, I can definitely still notice it 8 feet away with only the power on and no input. I watch blu-rays and play games on my ps3, and it can fluctuate pretty wildly depending on the content. Sometimes I can drown it out with the sound, other times when I'm browsing a menu, or during a quiet scene or dialogue in a movie, its just.....annoying, and distracting. What sucks is everything about the TV picture wise is great! Definitely worth the investment, but I'm not sure if:

1. I'm real sensitive to the buzzing,
2. There might be something wrong with the set.

RIght now, I'm kind of leaning towards # 2. I get that plasmas are suppose to "buzz", and I've only had the set for a few days, but I read that the buzzing doesn't ever really go away. Also, my settings are all below 50, and even in custom with the brightness lvl low, I can still hear the set from a distance, especially on a brighter scene. Once the tv is broken in, If I use higher settings Its probably only going to buzz even more.

Even on a black screen with a small, loading white symbol that pulsates (not alot) as a game loads, I can hear the buzz pulsate with it.

I'm sure a person's perception and environment plays a role, but I've read many people on here saying they have sets that don't buzz, or buzz fairly little. I work in electronics and checking out some plasma display models, on bright white scenes, I noticed no buzzing at all. Granted, its hard to judge sound in a department store, but it's an older model (c or s2?) and in torch mode, and I can't hear any buzz. I'm opening tomorrow, so first thing when it's nice and quiet, I'll power it on and give it a good listen.

I'd hate to go through the hassle of exchanging it for another one and getting something worse, but I might take my chances. I should probably post in the GT25 thread and see what the folks there say.

BigL84: Do you have an directional buzz that comes directly out the center front of the tv?

Any information on buzzing you can provide on any Panasonic plasma's old or new would be highly valuable.

ChadB said this about the new ST series:
"Buzzing: slightly more audible from VT25, though not enough to be concerned about."

With reports of identical directional buzz out of the VT25 thread.....i'd be highly wary of this problem being solved through different Panasonic plasma or 2011. It doesn't matter, I only need one report. One is good enough for me to know that this problem affects most of Panasonic's line. This problem depends *highly* on room acoustics and the user's sensitivity to it.

I could live with the buzzing of the boards in the back. The front directional buzz is what kills it for me.

I'm pretty sure theres no buzz isn't coming from the front in my screen, strictly from the back..I can easily hear it when im sitting front and center 6-8 feet away, and standing up and getting close to it, its just that much more noticeable.

today I looked at a C2, a VT20, and the new ST30. Again, its hard to judge with alot of background noise in a store, but even putting my ear behind the set, the only 1 I noticed any real buzz from was the C2, and even that on a white screen seemed less intense than my gt25.

One thing that really surpised me with the ST30 was the 3d mode. From what I understand, 3d requires more power, which on my gt25, means even louder buzzing. Either very few people have used the tv in 3d mode or my buzzing is really just that bad. Having read multiple reviews from countless users and critics, I've come across only 1 other person who mentions the increase in buzzing during 3d. I'm thinking maybe mines actually louder. Theres no way you can not notice the buzz in 3d. A bright white scene in 3d? forget about it.

However on the ST30 in store, with the TV running in 3d, my ear right behind the set, the buzz was very, very subtle. But then, The review you mentioned says the buzzing is slightly louder than the VT25. Maybe Panasonic improved on it?

At this point, I'm thinking it really is just luck of the draw. Still debating on what to do with mine.

Plasmas buzz.

Putt my ear to the back of a LG 60" 550 inside Costco and could hear a distinct buzz similar to the one on my G20. Same type of sound. Could multiply itself in a quiet environment. Something you have no idea about in a noisy sales place.

Its great you don't have the front buzz, its atrocious. Interesting however as yours is a GT series (newer) then my G series. Still buzzing.

I have read this thread with great interest, and should probably be posting in the VT25 thread, but this thread's contents are exactly what I am dealing with.

MarieAntoinette, I can tell you that my 2007 Panasonic TH-42PX80U is silent as a mouse... I moved it into my bedroom when I got the GT25... I've never noticed any sound from it in 3+ years.

As soon as I powered on the GT25 (located in the same location as the previous Panasonic) and turned on my Xbox, I heard the buzzing as the menus have a white background...

It seems to only stay for awhile if I keep the screen at the same place without navigating the menus... it goes away after about 10-20 seconds in some cases. Then it comes back without notice. I find this more annoying than a constant buzz would be. This buzzing is present on all sources (Blu-Ray, SD card break-in slides, Xbox, Wii, SD cable, HD cable).


I then had to return the GT25 due to a dead pixel. I decided to throw in a bit of extra cash and get the VT25.

Right away, I noticed the high-frequency 'buzzing' behaves exactly the same as the GT25... but it's LOUDER!


I also notice the directional buzz... which happens to be at its worst when I am in my optimal seat... (optimized for viewing distance/angle and surround sound!)

If I stand up the sound seems to go away but I'm not yet sure if this is just the aforementioned intermittent buzzing or an actual fluctuation based on listening position. It's quite maddening.

I tried swiveling the TV to the right and the sound isn't as loud in this position (but the couches face the other way so it can't stay like this).

The TV is in a wall unit type stand with a wooden backing that is probably amplifying the sound. I am considering lining it with some type of sound dampening material and possibly getting some type of mural for the wall directly behind my couch to minimize the sound reflection. Should I have to do this after purchasing a top-of-the-line TV? Remember, this doesn't happen at all with the older Panasonic plasma in the same location.

I am unable to return/exchange this TV unless authorized by Panasonic as unrepairable (as was the dead pixel issue) and it sounds like they say this is 'normal,' which it clearly is not. If I had the opportunity to return it I would consider the Samsung C8000 but have heard these buzz as well... albeit more of a constant buzz. This is incredibly frustrating as I'm kind of a perfectionist when it comes to creating the perfect atmosphere, and have invested and optimized an incredible surround sound system, only to have its sound stage ruined by this intermittent electrical buzzing sound emitted by "2010s best TV." I spent close to double what I originally planned on (I opted for the bundle including 3D Blu-Ray player, Avatar/Ice Age/Coraline, 3 pairs of 3D glasses), deciding to splurge in order to obtain the "best picture quality available" with 3D for future-proofing. The final, highest-reviewed, most expensive piece of my home theatre system is detracting from the experience!

I have been recommending Panasonic plasmas based on my great satisfaction with my 2007 Panasonic plasma, but I don't think I can recommend Panasonic products to anyone anymore. As a longtime plasma fan balking at LCD displays, my recent experience with new Panasonic TVs has me considering other brands and even LED (LCD). I used to compare my Panasonic plasma to acquaintances' LG plasmas and notice the Panasonic to be much better... but, again, with these recent events LG and Samsung are now very much worth a look since they have improved their sets over time, while Panasonic seems to be sadly getting worse.

I apologize if this post was long and disjointed! I am just trying to evaluate my observations and find the best solution, while sharing my experience with hopes of solving the mystery.

Well.
I'm sorry for your troubles, agent, but the info is worth alot/alot.
See!
We are all in this together and it means I am not totally out of my mind crazy imagining it or causing undue harm from my forum antics.

(I greatly appreciate the post here in the G20 thread, bringing your experience to my attention.)
also wanted to say that I listened to a C7000 Samsung Plasma today, 47"?, i'm 90% sure it had a definite directional buzz emanating from the front of the TV, top 1/3 center, compared to mid line on the Panasonic. back buzz was a given. How it would perform in a home? who knows, but very buzzy. I actually heard the buzz on this set from 3-4 feet away in a noisy store, originally thinking it was an LED. shocked after hearing the buzzing, i looked at the out of sight tag and realized it was a plasma. I'm starting to think that 2010 was the year of the buzzy plasma. Apart from those with cushy rooms and/or non anal hearing.