Panasonic 2011 GT30 buzzing - partial solution! - AVS Forum
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post #1 of 12 Old 10-19-2013, 04:28 AM - Thread Starter
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Hi guys,

While playing GTA V in morning silence I've said "enough" and got my GT30 naked to find the buzzing source. Surprisingly it wasn't located where everyone suggested (center board), but on the lower left corner of the TV (as google says "source of normal plasma buzz"). 

 

 

I wrote partial solution in the title, because I know what to do, to make it stop buzzing :

 

 What I don't know is how to make it stop permanently. Any suggestions ?

 

edit: I've found some leftovers of liquid sillicone rubber and made a "piramide" of it, hoping it'll be pushed by the back cover of the TV :) I do not now what about the heat, but I'll worry about it later :)

https://www.dropbox.com/s/2fl8mx50ys3rtpd/2013-10-19%2014.15.39.jpg

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post #2 of 12 Old 10-19-2013, 06:32 AM
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Usually the buzzing on these models is caused by the screws on the SC and SS boards. Remove each screw and re-install it. Make sure all screws are clean of debris and dirt.
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post #3 of 12 Old 10-19-2013, 08:14 AM - Thread Starter
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I've done it with the SS board but there's still buzzing (do you think that screws with washers would change anything ? ) , also I've noticed the low-frequency buzz from coils on the middle board. So now my solution is 1/3 solution .... ;)

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post #4 of 12 Old 10-19-2013, 08:56 AM
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You need to do the screws on both the SC and the SS board. The noise is caused by the board resonating with the metal panel frame.
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post #5 of 12 Old 10-19-2013, 11:59 PM
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Quote:
Originally Posted by paniczklos View Post

I've done it with the SS board but there's still buzzing (do you think that screws with washers would change anything ? ) , also I've noticed the low-frequency buzz from coils on the middle board. So now my solution is 1/3 solution .... wink.gif
If the screws are 'tight' and I'm sure you have checked them . . . and it STILL BUZZes, it's NOT the screws! Sorry tom669 but that is fact. Remember you were diagnosing "7" blink failure as the SU and SD cards here. Then about 6 months later, you finally realize that "7" blinks is most likely, the "SC" board w/ the SU/SD boards as secondary choices. Just a reality check.

paniczklos, as you have shown, the 'transformer' (the thing under the BLOB), vibrates due to sloppy build. One creative solution was done by an AVS member using cable ties. around the perimeter of the xformer to stop the vibration. His was NOT coated.

Interesting that your boards (SC, SU and SD) are all coated along with the xformers. Mine are not; mine was built in Dec 2011; I purchased it in Mar 2012.

When was yours built??

Regards . . . Jim

------------------------------------------------------

GT30 "Custom" Settings: http://www.controlcal.com/forum/showpost.php?p=6392

GT30 "THX" Settings: http://www.controlcal.com/forum/showpost.php?p=6393
GT30 "Vivid" Settings: http://www.controlcal.com/forum/showpost.php?p=6402


 

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post #6 of 12 Old 10-20-2013, 02:29 AM - Thread Starter
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Mine is from Feb 2011, so it's way older, maybe they've changed the process after getting feedback about buzzing. Or maybe yours is an american version and mine european ?

 

I've managed to get rid of the transformer vibrations with some sillicon rubber as seen here: https://www.dropbox.com/s/2fl8mx50ys3rtpd/2013-10-19%2014.15.39.jpg

 

but when I've assembled the TV back, it was still reacting to white levels .

 

Here's how I hear it:

1. High frequency buzz, that I got rid off with rubber. There's still some buzzing but much quieter, as heard on the video :)

2. Strange buzz with random frequency from the coils.

3. Buzz that I can't locate on the SS board. I've redone all the screws

 

And I've also marked names of the boards, looks like they're different from yours.

 

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post #7 of 12 Old 10-20-2013, 05:28 AM
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Quote:
Originally Posted by JForge View Post

If the screws are 'tight' and I'm sure you have checked them . . . and it STILL BUZZes, it's NOT the screws! Sorry tom669 but that is fact. Remember you were diagnosing "7" blink failure as the SU and SD cards here. Then about 6 months later, you finally realize that "7" blinks is most likely, the "SC" board w/ the SU/SD boards as secondary choices. Just a reality check.

I ran off the service manual provided by Panasonic; TV repair is a hobby, and as such I rarely see newer sets to repair. tw2005 is a lot more experienced with newer Panasonic sets, but he doesn't frequent this forum a lot.

There is a repair note out from Panasonic about the buzzing sound being related to the screws. I can probably dig it out if I look around. It mentions replacing the non-washer screws with ones with washers, too. I'm not sure how critical this is.
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post #8 of 12 Old 10-20-2013, 07:52 AM
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Quote:
Originally Posted by paniczklos View Post

Mine is from Feb 2011, so it's way older, maybe they've changed the process after getting feedback about buzzing.

And I've also marked names of the boards, looks like they're different from yours.

I've annotated your picture with board names based on their "functionality" . . .



The SC board is always connected to the SU and SD boards; the SS board is on the right side of the pic.

Yes, yours is a very early build; mine was probably one of the last production runs done.

There's a Panny PDF here that you can download; the functionality of the set HAS to be the same IMO . . .]

Very creative solution to the buzzing problem . . smile.gif

Regards . . . Jim

------------------------------------------------------

GT30 "Custom" Settings: http://www.controlcal.com/forum/showpost.php?p=6392

GT30 "THX" Settings: http://www.controlcal.com/forum/showpost.php?p=6393
GT30 "Vivid" Settings: http://www.controlcal.com/forum/showpost.php?p=6402


 

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post #9 of 12 Old 10-21-2013, 12:21 PM - Thread Starter
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Uh I've assembled it back, with the "rubber piramide" inside. The buzzing is quieter and I think it's audible only when I turn my ear at the TV :) (and also - buzzing is everything I 'want' to hear right now, so probably in week or two I won't hear it at all).

 

 

Ha, in european version the SC,SU an SD boards are one, so if something breaks I'll have to replace all three at once ;/ I hope my piramide won't do any harm to the board :)

 

Thanks for the tech manual :) 

 

Just now I've found a service manual, and it seems like it's for my version of TV - but still it has TC not TX at the beginning.

 

Here's the bard list form the manual (and basing on P board, it's mine version):

 

PCB TNPH0915GA A BOARD ASS´Y
PCB TNPA5402AB K BOARD ASS´Y
PCB TNPA5394 S BOARD ASS´Y
PCB TNPA5396 V BOARD ASS´Y
PCB TNPA5314 C1 BOARD ASS´Y
PCB TNPA5315AC C2 BOARD ASS´Y
PCB TNPA5390 P BOARD ASS´Y http://www.mikromega.com.pl/image.php?main=images/TNPA5390.jpg&watermark=watermark.png
PCB TNPA5330AB SN BOARD ASS´Y
PCB TNPA5331AE SS BOARD ASS´Y
PCB TNPA5332AE SS2 BOARD ASS´Y

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post #10 of 12 Old 10-21-2013, 02:59 PM
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Quote:
Originally Posted by paniczklos View Post

Uh I've assembled it back, with the "rubber piramide" inside. The buzzing is quieter and I think it's audible only when I turn my ear at the TV smile.gif (and also - buzzing is everything I 'want' to hear right now, so probably in week or two I won't hear it at all).


Ha, in european version the SC,SU an SD boards are one, so if something breaks I'll have to replace all three at once ;/ I hope my piramide won't do any harm to the board smile.gif
PA5332AE SS2 BOARD ASS´Y

Wow, the boards that seem to fail the most have been combined into one big board!! mad.gif That's something else. It appeared to be three (3) separate boards but upon closer examination, it's all one board.

Good Luck in your endeavors. . .

Regards . . . Jim

------------------------------------------------------

GT30 "Custom" Settings: http://www.controlcal.com/forum/showpost.php?p=6392

GT30 "THX" Settings: http://www.controlcal.com/forum/showpost.php?p=6393
GT30 "Vivid" Settings: http://www.controlcal.com/forum/showpost.php?p=6402


 

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post #11 of 12 Old 10-21-2013, 03:01 PM
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Quote:
Originally Posted by JForge View Post


Wow, the boards that seem to fail the most have been combined into one big board!! mad.gif That's something else. It appeared to be three (3) separate boards but upon closer examination, it's all one board.

Good Luck in your endeavors. . .

This is only the case on the 42" sets though.
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post #12 of 12 Old 10-21-2013, 03:12 PM
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I have two (2) scan boards available for sale . . . SU (upper) and SD (lower) boards. They have been tested by me and are good to go for a TC-P55GT30 or TC-P55ST30 models. Price is $75 for both.

These will fix the "7" blinks problem along with an "SC" board.



Send email to: jforgione@prodigy.net

Regards . . . Jim

------------------------------------------------------

GT30 "Custom" Settings: http://www.controlcal.com/forum/showpost.php?p=6392

GT30 "THX" Settings: http://www.controlcal.com/forum/showpost.php?p=6393
GT30 "Vivid" Settings: http://www.controlcal.com/forum/showpost.php?p=6402


 

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