Panasonic ZT60 and VT60 Fan/Fridge Noise Production Numbers - Page 49 - AVS Forum
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post #1441 of 1454 Old 07-04-2014, 05:04 AM
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Originally Posted by eric3316 View Post
Has anyone measured the sound level of the fans? Before and after?

My projector is around 30db and it sits 5 feet above my head and does not bother me at all. I can't imagine the ZT60 fans being any louder then this plus it would be further then 5 feet from your head.

Does it really matter? Either the fans annoy people or not, the loudness is not nearly as big of an issue as the undulating nature of the noise, a steady, as one person put it, "quality whir" would not be an issues, but this goes woo-woo-woo and to me that is the big issue.
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post #1442 of 1454 Old 07-04-2014, 05:58 AM
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I would take great care in the fan replacement selection, you need a fan with a Tachometer wire, 3rd wire, as the set monitors the fan speed. If it sees something wrong the power light will flash 11 times and repeat that sequence as the indicator there is a bad fan. As far as I could tell from the schematic it does not look like it will shut the TV down, there is separate temp sensors that do that.

As you can see from the schematic below, the fan has a TachOut signal that goes back to the main control board and will detect that the fan is not at the RPM expected, the downside of this is that it is a variable speed fan and when the control circuit sees it is not running at the right speed it will raise the fan output voltage to the max or until it hits the speed it wants, so you may just end up with a big fan going the same speed.

Personally I would get a cheap fan controller from Amazon and manage temp and fan speed without tapping into the Panni circuit at all and just un plug the factory fan and accept the 11 flashes of the on off light, which is way better than the fan noise.



Disclaimer -- I returned my ZT60 due to the fan noise and went with another set, I knew it would drive me up a wall and that "noise" problems are very hard to fix, but I had it for a week and had bought the service manual, thus the picture. I still follow this thread to see if any actually fully beats this issue.
Thanks for your reply. The PC fans I have have operate at relatively low maximum speed. When the TV would spin the fans to max speed this will not generate more noise than the standard fans. The 11 flashesI can live with. I want to give it a try soon. Do you know the type of fan connector used?
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post #1443 of 1454 Old 07-04-2014, 06:23 AM
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Originally Posted by CamaroDrvr View Post
Does it really matter? Either the fans annoy people or not, the loudness is not nearly as big of an issue as the undulating nature of the noise, a steady, as one person put it, "quality whir" would not be an issues, but this goes woo-woo-woo and to me that is the big issue.
If it didn't matter to me I would not have asked the question.
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post #1444 of 1454 Old 07-04-2014, 06:40 AM
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Originally Posted by eric3316 View Post
If it didn't matter to me I would not have asked the question.

Sorry if I mistook you for yet another idiot trying to tell people how this is not an issue because they have "insert your device here" that makes more noise.

So why does it matter to you?

Last edited by CamaroDrvr; 07-04-2014 at 07:08 AM.
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post #1445 of 1454 Old 07-04-2014, 07:07 AM
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Thanks for your reply. The PC fans I have have operate at relatively low maximum speed. When the TV would spin the fans to max speed this will not generate more noise than the standard fans. The 11 flashesI can live with. I want to give it a try soon. Do you know the type of fan connector used?
Sorry, the manual does not describe the connector itself or have a picture of it. I will note that this is not a straight DC fan, it is a PWM fan hooked to and 8702 Fan Controller chip that talks to the main logic board. This chip can easily be fried if the connections are revered or the fan draws more current than it is designed for.

Using an external fan controller will remove that risk and get you the same result, you'll just have the 11 blinks. The chip is not socketed so replacing it will be challenging, you can get the part on the Panni site for $1.89, the Panni part number is C0DBAYY00932 in case you do fry it...

An external fan controller is as cheap as 15 bucks and they come with temp sensors and the ability to set the temp vs fan speed curve. The best part of this is you don't void your warranty since you can remove it all, if you cut the connector I suspect you'll void the warranty.

Good luck, I would love to see someone fully solve this issue! (I suspect many others here would also.)
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post #1446 of 1454 Old 07-04-2014, 08:41 AM
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11 blinks will cause a shutdown of the TV from my experience. Typically the display will light up for about 10 seconds. You'll usually see program content and then it will shut down with 11 blinks. So if you do replace the fan, you need to emulate that tacho signal.

Most Panasonic plasmas only have two speeds for the fans, a slow speed which is run almost all the time (about 7V), and a faster speed (about 10V) which is noticeably louder and only ever engaged when the TV temperature increases substantially.
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post #1447 of 1454 Old 07-04-2014, 04:12 PM
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my new VT60 also has some fridge noise or hissing which is somewhat audible in quiet situations. I also noticed that theres already some foam where the fans are located.

However, is there any way to get rid of that noise completely or at least decrease it even further?

what about the theory that is has something to do with the back cover screws?

Last edited by persona; 07-04-2014 at 04:18 PM.
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post #1448 of 1454 Old 07-04-2014, 09:07 PM
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Originally Posted by persona View Post
my new VT60 also has some fridge noise or hissing which is somewhat audible in quiet situations. I also noticed that theres already some foam where the fans are located.

However, is there any way to get rid of that noise completely or at least decrease it even further?

what about the theory that is has something to do with the back cover screws?
Everybody's fans have some foam. Whether they have the foam just in front of (what you are probably seeing) or also behind some of the fans is what determines whether your set has the "fix" (read a few pages back, you want to also have the foam behind the fans). The "fix" decreases the noise.
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post #1449 of 1454 Old 07-05-2014, 04:54 AM
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Originally Posted by tom669 View Post
11 blinks will cause a shutdown of the TV from my experience. Typically the display will light up for about 10 seconds. You'll usually see program content and then it will shut down with 11 blinks. So if you do replace the fan, you need to emulate that tacho signal.

Most Panasonic plasmas only have two speeds for the fans, a slow speed which is run almost all the time (about 7V), and a faster speed (about 10V) which is noticeably louder and only ever engaged when the TV temperature increases substantially.

Tom -- You are right, I hunted around the service manual it is it part of the SOS chain which means it shuts down once it bangs out the 11 blinks. Would not be hard to simulate if he is an electronics type guy but impossible if not... Little 555 timer with the right RC network should take care of it, he would just hang a scope on it first to see what it looks like.


Another way would be to use the existing fans with the blades cut off.
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post #1450 of 1454 Old 07-05-2014, 04:58 AM
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Originally Posted by persona View Post
my new VT60 also has some fridge noise or hissing which is somewhat audible in quiet situations. I also noticed that theres already some foam where the fans are located.

However, is there any way to get rid of that noise completely or at least decrease it even further?

what about the theory that is has something to do with the back cover screws?

I have followed this thread from the start and to date not seen a repeatable solution, that is I mean, someone fixing it, describing that fix, and someone else successful using the fix.
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post #1451 of 1454 Old 07-05-2014, 05:37 AM
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I found this in a german forum, apparently its a combination of magnetic foil and part of a plumber's helper: http://www.hifi-forum.de/index.php?a...postID=764#764
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post #1452 of 1454 Old 07-05-2014, 06:08 AM
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I found this in a german forum, apparently its a combination of magnetic foil and part of a plumber's helper: http://www.hifi-forum.de/index.php?a...postID=764#764
The "Plunger fix" but with the addition of magnetic foil and Plumbers Helper. At least one person on this forum has used the Plunger Fix and reported if solved his fan noise problem. I think he used two plungers instead of one. The Top Gun Baffle works in a similar manner and also reported to successfully reduce the fan noise. You can search this thread for links to both methods.
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post #1453 of 1454 Old 07-05-2014, 03:01 PM
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Hi all

I'm a new ZT60 owner. I'm breaking in the plasma but the noise is driving me crazy. It seems to come primarily from the left side of the tv if I'm looking at the front. I can see foam in behind the fans but there is a constant woo woo woo droning I can easily hear 10 ft away and even with the volume on low.

My questions are: do I have a dud and should replace it?, or is there a fix for my set 's woo woo even though it has foam?

I'm tempted to keep my old panasonic plasma and just fire this back for the poor quality control.
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post #1454 of 1454 Old 07-07-2014, 03:31 PM
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If you search this thread you will find my plunger fix. It has been on my VT60 for the close to 6 months I have owned the set. I do not hear any noise from my 12 foot seating position since.
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