Panasonic GT50 buzzing poll - Page 2 - AVS Forum | Home Theater Discussions And Reviews
View Poll Results: Can you hear your GT50 buzzing when you are sitting at the distance you watch the TV from and over n
Yes and I'm under 20 years old. 1 1.04%
No and I'm under 20 years old. 0 0%
Yes and I'm 20 - 30 years old. 15 15.63%
No and I'm 20 - 30 years old. 11 11.46%
Yes and I'm 30 - 40 years old. 11 11.46%
No and I'm 30 - 40 years old. 10 10.42%
Yes and I'm 40 - 50 years old. 9 9.38%
No and I'm 40 - 50 years old. 12 12.50%
Yes and I'm 50 - 60 years old. 5 5.21%
No and I'm 50 - 60 years old. 12 12.50%
Yes and I'm over 60 years old. 1 1.04%
No and I'm over 60 years old. 9 9.38%
Voters: 96. You may not vote on this poll

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post #31 of 47 Old 11-28-2012, 01:29 PM
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I would add in to your testing matrix, "variability in quality of hearing". A lot of people here think that they hear well, and I'm quite sure they don't.

There's a saying about "everything in moderation". If only it was applied to well, you know...
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post #32 of 47 Old 11-28-2012, 04:40 PM
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Quote:
Originally Posted by rogo View Post

I would add in to your testing matrix, "variability in quality of hearing". A lot of people here think that they hear well, and I'm quite sure they don't.

Agreed. Ideally everyone would have sound meter measurements for comparison, but that isn't going to happen for so many reasons.

Also, another item we can add to this list is user settings. Someone running on vivid mode, with 100% brightness, is much more likely to hear buzzing than someone who has turned their brightness way down.
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post #33 of 47 Old 11-29-2012, 07:32 AM
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Hi Guys,
Great thread, but I have to think there is too much variability here to accurately compare these results. Off the top of my head I can see the following differences amongst users causing issues:
1) Plasma mounted on wall vs on stand - maybe a wall mount helps to block/diminish the sound given the proximity of the plasma to the wall?
2) Plasma located in a room with carpets/drapes vs one with hard floors and uncovered windows
3) People testing buzzing with no volume vs those testing with volume on
4) Some people testing on darker content vs those testing on bright or all white content (ie worst case scenario)
5) Ambient room noise (eg someone next to kitchen with loud fridge, someone with a loud PVR that is always on)
Any of these individually, or in combination, could easily explain differences in people's perception of buzzing. I think it's time this forum came up with an objective approach to testing buzzing, especially since this is a "science" forum. Going forward, I think any testing/reporting for buzzing should include the following:
1) Identify plasma installation - wall mount or stand, and if your room contains carpets/drapes that may absorb the sound
2) Turn off volume on the TV/Receiver. Testing should occur without any programming sound.
3) Turn off all other sources of sound in the room
4) Test primarily on bright content. Putting up an all white slide would probably be best.
Now, if someone was to do all of the above, should they still consider their panel defective if they can hear buzzing from more than a few feet?

My friend who's 60" ST30 had to be repaired sits on a wood credenza in a big living room with bare hardwood floors, no carpets, and wooden shutters on all the windows, and hard plaster walls. When i first set up his TV for him it was virtually silent until the board failure caused a loud buzzing, then after it was repaired it was again silent as it was before. Me and his family have specifically listened for buzzing and we all agree that it can't be heard beyond a foot or so from the screen. I've set up over a dozen Plasmas for people and none of them buzzed excessively (some at 1 foot, some at 4ft, etc) and of all my other friends who have Plasmas only one had one (not a Panasonic) that i could hear slightly from her couch but she couldn't quite hear it unless she sat dead center in front of her screen (maybe 8 feet away). I just don't accept the notion that it's normal to be able to hear a Plasma buzz from anything close to a normal viewing position, because that has not been my experience over the past 12 years of scrutinizing these things.


Here's something i posted in the ST50 thread the other night before dinner:

"Right now i'm displaying the "whitest" slide show image on my 50GT50 in a silent room and i cannot hear any buzzing with my face a foot from the screen, but i can hear the fan on my Tivo below it and also the fan on my PC that's 15 feet away from the TV, and i can hear the fridge humming in the kitchen well beyond that. But i cannot hear any buzzing with my nose almost against the screen. When i put my head behind the TV then i can hear a little mosquito buzz from inside, but nothing from in front. This is what i consider to be normal operation, albeit on the better side of the range."


And a few hours ago we got woke up about 4am (friggin loud racoon vs cat fight right outside our bedroom window) and after i broke that up i was now wide awake so i took the opportunity to repeat the above test but this time in total 4:30am silence. My PC was off and i turned my AVR off then i brought up my brightest break-in images and brightest HD wallpaper images and put the TV into VIVID mode at 100% Contrast and when i hook my ear over the top rear of the cabinet i can hear the low level buzzing from inside. As soon as i move my ear to the front the buzzing greatly diminishes and by the time i'm a foot away from the screen i hear nothing. Zero. I sat there in silence and strain to hear the buzz but it's completely silent. All the while i am able to hear the quiet whirr of the fans on my Tivo and TWC DVR in the credenza below the TV, but nothing from the TV. When i repeat this test in Custom mode at 85% Contrast and Panel Brightness set to Mid the TV is actually a little quieter.

Maybe my GT50 is abnormally quiet, but it's a teensy bit quieter than my G10 in a bedroom which i can't hear beyond a few feet. My old 2005 42PX50U in the den has been getting louder over the years and we can hear it buzz from about 5 feet away on very bright scenes but not at all at our 10 foot viewing distance. This is by far the loudest of my four Plasmas, yet cannot be heard from the couch.

My 26" HP LCD TV also buzzes from one foot away FWIW.

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post #34 of 47 Old 01-30-2013, 04:16 AM
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Distance is really all that matters here - I've owned quite a few Plasmas and they all have slight buzzing to some extent (Samsung/Panasonic).

However, I could never hear the buzz unless I put my ear above or behind the TV and had the volume on mute. I normally sit at least 7-10 ft away from my television so I never hear it.

I'm on board for the GT50 and it will arrive tomorrow so I'll update as soon as I can.
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post #35 of 47 Old 01-30-2013, 05:40 AM
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I won't vote since I haven't had a GT50, but I'm 34 and have heard buzzing over audio in quieter scenes in every plasma I've been around. Most recently at 55" UT50 I sent back. Could hear it constantly in bright quiet (i.e. dialogue only or very quiet music) scenes from my couch 8 feet away. With a white slide up and no sound I could hear it from pretty much anywhere in the condo (15 feet or so into the hall is the furthest I can stand away and still hear it with the TV in sight--but could hear it in other room too).

Had them send a tech. He said he couldn't hear it (older guy so maybe the age thing does matter, or maybe he was just BSing. Most likely the latter as my girlfriend commented on how loud white slides where, though she couldn't hear it over dialogue in bright scenes like I could). He just replaced the screws with new ones with lock washers, but it didn't help at all. Wasn't receptive to replacing any boards since he didn't hear anything and said that buzzing is normal and that "you're going to hear something."

Had a similar experience with a Vizio plasma several years back--though they replaced the power board that time to no avail. I've also heard it on every plasma I've been around in friend's houses (probably 5 or so over the years--most have LCDS/LEDs). No idea if I (and my friends) just have bad luck with getting bad units, or if I'm just extra sensitive to hearing buzzing noises. I do tend to notice things like the fridge buzzing, the DVR whirring that my girlfriend doesn't hear when I mention it. In any case, I just swore off plasma and went with an LED this time (and an LCD RPTV years back after the Vizio).

I like plasma picture quality and the lower prices, but I can't live with buzzing that I seem to hear on all of them I've been around (all lower end models, maybe the mid and top tier models are better made and have less proclivity to buzz?).and I also got annoyed with IR both times I bought one as I do a lot of gaming and watch a ton of ESPN. Add in having a brighter room now and plasma just isn't an ideal fit for me unfortunately. Hopefully OLED or some other tech comes along that matches or exceeds plasma PQ without the proclivity for buzzing, IR and washing out in brighter rooms (and requiring pricier models with filters to be useful in bright rooms).
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post #36 of 47 Old 02-01-2013, 06:29 AM
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Is there a direct phone number to get to scheduling a Panasonic tech to come out? Or do you have to go through the regular customer service line?
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post #37 of 47 Old 02-01-2013, 06:57 AM
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Following up on my original post - I received my 60" GT50 yesterday and WOW this thing is incredible in terms of PQ!

As for a buzz... I have to say this is the quietest plasma I've ever owned - no question. I could barely hear anything with my ear right up to the TV on a white screen, while muted.

So far everything is checking out to live up to or exceed my expectations - now onto the custom calibration.
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post #38 of 47 Old 02-01-2013, 07:26 AM
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Quote:
Originally Posted by SirChadwick1 View Post

Following up on my original post - I received my 60" GT50 yesterday and WOW this thing is incredible in terms of PQ!

As for a buzz... I have to say this is the quietest plasma I've ever owned - no question. I could barely hear anything with my ear right up to the TV on a white screen, while muted.

So far everything is checking out to live up to or exceed my expectations - now onto the custom calibration.

good to hear. there really is hope.

I am mostly ignoring it as well - except certain commercials with little speech, or no music - dunkin donuts, fiat, ABC, towards the end all have bright white and its clearly audible. The real measure of tolerance is to actually watch a bright white movie (ice age) to see if its bothersome.
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post #39 of 47 Old 04-28-2019, 12:39 PM
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Well unfortunately, after almost 7 years of daily use with virtually silent buzz-free operation, our trusty 50" GT50 in the wife's den suddenly started buzzing last night while watching the news. It started out being very slight but noticeable from the couch (8 feet away), then all of a sudden it got a LOT louder. The brighter the scene, the louder it buzzes. Way too loud to ignore and way too irritating to watch. As i Fast-Forward the DVR, i can hear the buzzing increase and decrease corresponding to the screen getting brighter and dimmer as scenes and screen brightness changes.

Edit: I came back to mention that over the past several months, i would sometimes hear a slight buzz when a very bright scene appeared on the screen then would go away when the scene changed to darker. But the vast majority of the time it stayed completely quiet during bright scenes - but this new behavior started to worry me a little. But then it would be quiet for weeks and i'd kinda forget about it. Now i realize i should not have ignored those early warning buzzes.

If i get time this afternoon i'm gonna remove the back cover and check the tightness of all the boards' mounting screws. If that doesn't fix it, i'll try to narrow down the exact item that is buzzing (using my mechanic stethescope to touch various coils and capacitors and see if i can find the one that's buzzing). I'm hoping it isn't a failing board as this is our primary TV and i don't want to have to deal with removing the offending board and sending it out for repair.



___________

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Last edited by RandyWalters; 05-04-2019 at 08:09 AM.
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post #40 of 47 Old 04-29-2019, 03:13 AM
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Quote:
Originally Posted by RandyWalters View Post
Well unfortunately, after almost 7 years of daily use with virtually silent buzz-free operation, our trusty 50" GT50 in the wife's den suddenly started buzzing last night while watching the news. It started out being very slight but noticeable from the couch (8 feet away), then all of a sudden it got a LOT louder. The brighter the scene, the louder it buzzes. Way too loud to ignore and way too irritating to watch. As i Fast-Forward the DVR, i can hear the buzzing increase and decrease corresponding to the screen getting brighter and dimmer as scenes and screen brightness changes.

If i get time this afternoon i'm gonna remove the back cover and check the tightness of all the boards' mounting screws. If that doesn't fix it, i'll try to narrow down the exact item that is buzzing (using my mechanic stethescope to touch various coils and capacitors and see if i can find the one that's buzzing). I'm hoping it isn't a failing board as this is our primary TV and i don't want to have to deal with removing the offending board and sending it out for repair.



___________

Well, it sounds like you're on the right track. I had to fix loose screws on my daughters 50GT30 a couple years ago and it's been fine since. Of course that's a different series. Something that can help with the stethoscope is to remove the probe on the end and use a piece of hose instead. Most of them have a hose running out to the plastic sensor diaphragm, take that out of the hose and slip a piece of 3/8" hose over that hose. This will help narrow down the area quickly then switch back to the probe. This may help avoid a false positive from traveling noise. Best of luck in your quest for the truth!
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post #41 of 47 Old 04-30-2019, 07:33 AM
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Quote:
Originally Posted by whipit View Post
Well, it sounds like you're on the right track. I had to fix loose screws on my daughters 50GT30 a couple years ago and it's been fine since. Of course that's a different series. Something that can help with the stethoscope is to remove the probe on the end and use a piece of hose instead. Most of them have a hose running out to the plastic sensor diaphragm, take that out of the hose and slip a piece of 3/8" hose over that hose. This will help narrow down the area quickly then switch back to the probe. This may help avoid a false positive from traveling noise. Best of luck in your quest for the truth!
Well i went ahead and removed the rear cover that Sunday afternoon (I left it upright on the stand). The TV was cold from being off for the previous 18 hours so the buzzing was fairly low (nothing like the buzz-saw sound the previous night), and was indeed coming from the SC board when i touched various components on it with the probe. The other boards were relatively quiet. This was before you posted the hose trick, that would have come in handy to eliminate the travelling noise issue with that probe. Everywhere i touched i could hear a hum or a slight buzz, but that Scan Drive Board was by far the loudest.

So i started checking the SC board's screws and they were all a little loose - they all required snugging them down by 1/8 to 1/4 turn each. I ended up doing the same thing on all the other boards' screws and every single one of them were similarly loose. And for the heck of it i snugged down any other screw i found while i was in there.

I left the rear cover off, changed the Picture Mode from THX Cinema to VIVID and started playing back and FF'ing the same programs that caused the buzzing the previous night and there was NO BUZZING !! I left the TV on for a while while piddling around the house and i kept going back into the room to check it and the TV was completely quiet - even with the rear cover off. I placed my head behind the TV and it was just as quiet now as when i posted back on Nov 2012. So i installed the rear cover, turned the TV off, and left to run some errands.

While i was at a store, the wife calls and says "Something is wrong with the TV" and i'm like "Oh phuk". I asked if it's buzzing again and she said "No, it's totally quiet, but the picture is all cartoonish looking and the colors are all exaggerated". Then it hit me that i forgot to take it out of VIVID mode before leaving the house LOL. Scared the heck out of me. I put it back into THX Cinema when i got home.

We watched a movie on it Sunday night then about an hour of news, then we had it on for 3 hours Monday night and the TV is totally quiet. The screw-tightening did the trick !

Earlier that Sunday morning (before fixing the TV) i was contemplating replacing it with either a new Sony XBR49X900F (i do love my 55" X900E in the man-room), or maybe cheaping out and getting her a new TCL 49" S515 series UHD LCD ($299) or even a used Panny 50" ST60 Plasma that i found nearby on Craigslist for $250. I'm so glad the TV is fixed though



.............

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post #42 of 47 Old 05-02-2019, 06:52 PM
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Now that this has happened to me, and knowing that there are GT50 owners with buzzing TVs maybe everybody should remove their rear covers and snug all the board screws down (might quiet down the ones that buzz, and might prevent quiet ones from developing a buzz down the road). And i wouldn't limit this thought to just the GT50, i'd do it regardless of model number since there are reports of buzzing on all models.


I just cross-posted some of this in my Official GT50 Thread for owners that have a buzz or are concerned that theirs might start to buzz later:

https://www.avsforum.com/forum/167-p...l#post57990874


____________________________________
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Quote:
Originally Posted by RandyWalters View Post
Now that this has happened to me, and knowing that there are GT50 owners with buzzing TVs maybe everybody should remove their rear covers and snug all the board screws down (might quiet down the ones that buzz, and might prevent quiet ones from developing a buzz down the road). And i wouldn't limit this thought to just the GT50, i'd do it regardless of model number since there are reports of buzzing on all models.


I just cross-posted some of this in my Official GT50 Thread for owners that have a buzz or are concerned that theirs might start to buzz later:

https://www.avsforum.com/forum/167-p...l#post57990874


____________________________________



Well this is great news!. So glad to hear you got this fixed. I did my ST30 years ago and it's still running strong. I just bought a mount for my VT60 and will take off the back to retorque the screws and clean the dust, those fans surely have spread some across it with it's daily use since new. Those loose screws can cause voltage drop to ground and burn up a board, so well worth doing.
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post #44 of 47 Old 05-03-2019, 07:37 AM
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Quote:
Originally Posted by RandyWalters View Post

I just cross-posted some of this in my Official GT50 Thread for owners that have a buzz or are concerned that theirs might start to buzz later:

https://www.avsforum.com/forum/167-p...l#post57990874


____________________________________
My 60GT50 is 7 years old and I have not experienced a noise issue. But I'm wondering if it's not just a matter of time. I would like to tighten up the mentioned screws but I don't know where to start and what to look for. I never had the back off. Is there a diagram of some sort that shows the screws that need to be tightened? Thanks
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post #45 of 47 Old 05-03-2019, 07:22 PM
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Loose screws took out my Gt30 twice. Always the SC board. Got smart the second time and put blue locktite on and no issues. Lol on the Vivid mode Randy.
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post #46 of 47 Old 05-03-2019, 09:12 PM
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Quote:
Originally Posted by Eddie E View Post
My 60GT50 is 7 years old and I have not experienced a noise issue. But I'm wondering if it's not just a matter of time. I would like to tighten up the mentioned screws but I don't know where to start and what to look for. I never had the back off. Is there a diagram of some sort that shows the screws that need to be tightened? Thanks
It's actually easy, just a bit tedious. I googled for Panasonic 50GT50 Service Manual but only found one for the TC-P60GT50 Service Manual at manualslib and downloaded it. It was helpful in pointing out all the screws that need to be removed to get that cover off (which basically is every screw you see on the whole back ha ha).

I think this is the direct link:

https://www.manualslib.com/download/...c-P60gt50.html

The Board Layout diagram is on page 6. Note the SC board's location - this was my offender (as well as many other owners).

Go to page 19 and you'll find "9.2. Disassembly Procedure for the Unit"

The screws are soft so be careful not to strip the phillips slots when loosening or tightening. Use the right size driver that fits snug into the slots. They strip easily.

Tip: I also used a magnetized screwdriver - that makes it much easier to keep track of these little screws so they don't drop and get lost. It also makes it easier when re-assembling - just stick the screw onto the end of the screwdriver to get the screw started. It's hard with bare fingers cause they're so small and droppable. They're easier to guide into place and start with the magnetic screwdriver.

Tip: The rubber feet under the pedestal base are very grippy and make it hard to turn the TV around, so i put a small towel under the base - it makes it much easier to slide/swivel/turn the TV on it's base when it's sitting on the table. (I've also used this trick as a poor-man's-table-swivel for relatives who like to turn their TVs to face other parts of the room - especially handy on narrow viewing angle LCD TVs heh heh).


Remove the stand bracket cover from the back of the TV - but only remove the 4 small screws along the very top and the two bottom corners. The manual says to remove the 4 (larger) stand screws in the middle area but i left them alone since i kept the TV sitting upright on it's stand, so there was no need to unbolt it. I also removed the adjoining pedestal tube cover (one center screw on top) but i think maybe that one wasn't necessary. Put the screws and cover(s) in a baggie.

Remove the Bluetooth module near the bottom w/ 1 screw and put it all in a baggie.

Remove the Wi-Fi/Lan module near the bottom w/ 1 screw and put it all in a baggie.

Remove the 2 screws and the plastic ring surrounding the power cord receptacle clamp and put it all in a baggie.

Remove the two screws to the left of the SD card (i think these had lock washers on em). They are larger than the others so i put them in their own separate baggie so i don't mix them up with the others.

Before you start removing that rear cover, be aware that the edges are really sharp - almost knife like, so don't slide your hands along that edge cause it will cut you. Almost got me a few times so i had to concentrate. Think of it as removing a giant 4 foot square razor blade LOL and handle it very gingerly.

Ok now you're ready to remove the cover. Look at diagram "9.2.6. Remove the Rear cover" and see all the arrows pointing to all the little screws you're going to remove. It's a lot. And remember they're soft.

Starting at the bottom, remove the screws around the perimeter and work your way up. You can pull the bottom away as you go to check if you missed any screws (there was well over a dozen on mine, maybe even more on your bigger TV). And my top 2 middle screws had blue locktite on the threads, but none of the other screws did. Just those 2. These were the last ones i removed cause they're in the center and made it easy to support and lift the cover from the bottom with my other hand. I stuck these screws in their own baggy. Remember these 2 when you re-install the rear cover.

Just snug all the board's screws down till they're tight. Don't crank them down hard, just tighten them till they stop (you'll feel it). I tightened every screw i saw including all the various non-board screws too.

Installation of the cover is the reverse of removal. The whole job took me less than 20 minutes.
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Randy
Sony XBR-55X900E, Panasonic TC-P55ST60, TiVo Roamio Pro, TWC Arris DCX3600-M 6-Tuner DVR, Darbee DVP-5000S, Onkyo TX-SR333 AVR, URC MX-890 Remote.
Pic of My A/V setup - http://cdn.avsforum.com/f/f1/900x900..._Img_4867.jpeg
Gallery - https://www.avsforum.com/g/a/2082686/randywalter...

Last edited by RandyWalters; 05-04-2019 at 07:54 AM. Reason: Added a few pics
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post #47 of 47 Old 05-04-2019, 06:32 AM
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Quote:
Originally Posted by RandyWalters View Post
It's actually easy, just a bit tedious. I googled for Panasonic 50GT50 Service Manual but only found one for the TC-P60GT50 Service Manual at manualslib and downloaded it. It was helpful in pointing out all the screws that need to be removed to get that cover off (which basically is every screw you see on the whole back ha ha).

I think this is the direct link:

https://www.manualslib.com/download/...c-P60gt50.html
The Panasonic TC-P60GT50 is the TV I have so that's the correct service manual. I can't thank you enough because you went over and above of what I expected. I'm sure with the manual and your instructions I'll get it done. I like to hold onto my plasma as long as possible. As long as the picture is still excellent. It's also one of the last 3D models. No new 3D content but there are loads of older stuff online.
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