Official Panasonic GT50 Series Discussion Thread [No Street Price Talk] - Page 330 - AVS Forum | Home Theater Discussions And Reviews
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post #9871 of 9880 Old 07-19-2015, 09:19 PM
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Enjoyed Mad Max Fury road this weekend, this scene looks fantastic on the GT50 Played using HTPC w/ MPC/Madvr. Picture doesn't do justice, it looked so much better in person.

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Edit: don't know why it's upside down, sorry.

TV's - Panasonic 55ST60 , Panasonic 55GT50 THX, Main Speakers - Klipsch Gallery G28's, Center Channel- Klipsch RC-52, Sub-Klipsch Sub 12, Surround - Klipsch RS-52 II Bluray/Game - HTPC/PS3, Receiver - Onkyo RC-360, HTPC- Intel Core i3, HDMI,Windows 7,XBMC,Bluray,7 TB, Video Processor -Darbee

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post #9872 of 9880 Old 07-21-2015, 10:47 PM
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Buzzing/Hum issue isolated!

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Originally Posted by Bill Mac View Post
I've had the buzzing issue with my 60GT50 pretty much since it was new. A tech from Panasonic came out 2-3 times and changed the screws and tightened them with no luck. Now the buzzing cycles in loudness which is driving me crazy. I called Panasonic customer service awhile back and they said it was out of warranty so there was nothing they could do. I told them that the buzzing issue started well within the warranty but they didn't care. The 60GT50 will be the last product I'll ever buy from Panasonic. I was thinking of adding some type of sound deadening material on the wall directly behind the panel as it's mounted on the wall. Has anyone tried this or heard of anyone trying it?
After further troubleshooting I found the loud buzzing/hum that cycles on and off that gets louder when the screen has bright images is coming from my two Rythmik F12SE subs. The subs are placed on either side of my rack right below my 60GT50 so it seemed as if the hum was coming from the plasma. But when I unplugged both subs the hum was silenced. The F12SEs have torodial transformers which are noisy due to possibly getting DC offset from the plasma. If I plug the subs or the plasma into a different circuit the hum stops. It was great to finally isolate what was causing the loud and very noticeable hum .

Bill

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Emotiva XMC-1, Wyred 4 Sound SX-500s, ST-500, ST-250, Oppo BDP-103/105D, Panasonic TC-P60GT50 plasma, Panamax 5100EX, Salk 1801-TLs, Salk 1801b center, ADS 300C (surrounds) and two Rythmik F12SEs.
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post #9873 of 9880 Old 07-22-2015, 06:59 PM
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Quote:
Originally Posted by Bill Mac View Post
After further troubleshooting I found the loud buzzing/hum that cycles on and off that gets louder when the screen has bright images is coming from my two Rythmik F12SE subs. The subs are placed on either side of my rack right below my 60GT50 so it seemed as if the hum was coming from the plasma. But when I unplugged both subs the hum was silenced. The F12SEs have torodial transformers which are noisy due to possibly getting DC offset from the plasma. If I plug the subs or the plasma into a different circuit the hum stops. It was great to finally isolate what was causing the loud and very noticeable hum .

Bill

Excellent!!!

TV's - Panasonic 55ST60 , Panasonic 55GT50 THX, Main Speakers - Klipsch Gallery G28's, Center Channel- Klipsch RC-52, Sub-Klipsch Sub 12, Surround - Klipsch RS-52 II Bluray/Game - HTPC/PS3, Receiver - Onkyo RC-360, HTPC- Intel Core i3, HDMI,Windows 7,XBMC,Bluray,7 TB, Video Processor -Darbee

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post #9874 of 9880 Old 07-23-2015, 04:36 AM
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Quote:
Originally Posted by Latinoheat View Post
Excellent!!!
Thanks ! I hope it would be this easy for all owners of Panasonic plasmas that have the buzzing issue.

Bill

My SACD collection, watch it grow and my wallet shrink ;-).

Emotiva XMC-1, Wyred 4 Sound SX-500s, ST-500, ST-250, Oppo BDP-103/105D, Panasonic TC-P60GT50 plasma, Panamax 5100EX, Salk 1801-TLs, Salk 1801b center, ADS 300C (surrounds) and two Rythmik F12SEs.
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post #9875 of 9880 Old 07-23-2015, 07:43 AM
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Quote:
Originally Posted by Bill Mac View Post
After further troubleshooting I found the loud buzzing/hum that cycles on and off that gets louder when the screen has bright images is coming from my two Rythmik F12SE subs. The subs are placed on either side of my rack right below my 60GT50 so it seemed as if the hum was coming from the plasma. But when I unplugged both subs the hum was silenced. The F12SEs have torodial transformers which are noisy due to possibly getting DC offset from the plasma. If I plug the subs or the plasma into a different circuit the hum stops. It was great to finally isolate what was causing the loud and very noticeable hum .

Bill
Glad you sorted it.

I have the same combination (GT50 and single F12SE). I've never had the buzzing problem though, possibly because I have my main system, consisting of:
  • TX-P50GT50B - primary monitor
  • Samsung LED display - secondary monitor
  • Dual HDMI output AVR
  • BDP
  • DVD player
... plugged into a professional class 1.5 kVA isolation transformer, placed between the Rythmik F12SE mains input.


That's a viable alternative for those who don't have the option of a different mains circuit.

Last edited by Iain-; 07-24-2015 at 07:00 AM. Reason: typo
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post #9876 of 9880 Old 07-30-2015, 10:53 PM
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Quote:
Originally Posted by SmileandWave View Post
Hi,

Saw this post from a few years ago. First picture I've seen that's exactly the same as the issue I have on my 60ST50 - wider black band, a few floating pixels in it. Unfortunately, I've had mine for two years as well. If you remember, was there a proposed fix for yours? Or was it just a goner?
Sorry, obviously this is a really late reply but in case you're still wondering, mine was a goner. The authorized service rep came and diagnosed it and his repair quote, including parts, exceeded the cost of the TV so it was replaced under (store's extended) warranty. Knock on wood, my 65GT50 is holding up pretty good so far.
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post #9877 of 9880 Old 07-31-2015, 07:00 AM
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I see references in this thread to the buzzing issue. I had this issue on my 65vt30

I bought the protection plan from Best Buy. They have outsourced the repair to another repair company. I had the buzzing and arcing in the top left corner of the tv when looking at the back.

The repair company picked up the tv and just replaced the screws and said there was no more buzzing. They didn't check for the arcing before doing the repair. I explained that I felt the board should be replaced where it was arcing as I can't imagine arcing to be good for the board. They then replaced the SC Board to satisfy me.

After reading some of the posts though in this forum and other threads, I am questioning if this is the correct board to replace. I could see the arcing in the upper most left vent looking in the back of the tv. Can anybody confirm if this is correct? Also should I be pushing for the other boards to be replaced too after this issue as I read that this issue could cause other boards to go bad?

The repair company just seems to consider a TV repaired if it powers back on and works again where my concern is that these parts have been damaged from their arcing, I get the TV back, and 6 months later the tv dies on me due to this issue and I am now out of warranty. I would of thought some diagnostics or tests should be done to confirm the boards are not damaged or something.

Just wondering if anybody has advice who has experienced this issue on their TV as I know it has existed on a lot of other models.
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post #9878 of 9880 Old 08-07-2015, 11:07 AM
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Green haze

A strange situation has cropped up in the last couple of months with my 60GT50. There is about a 4 inch by 6 inch faint green haze on the right side of my screen, about 2 inches from the edge. It is so faint that you can really only see it on white backgrounds. Sometimes it is not visible, other times it is. There is no rhyme or reason when it is visible. Sometimes it can't be seen if the set has been off for a period of time, sometimes it can. Like I said above, it is really only visible with a white background, and even then it is very, very faint. Has anyone else run across this?
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post #9879 of 9880 Old 08-26-2015, 05:16 PM
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Parts of your description kinda sound like some very minor IR, but not totally. Could also be some very minor "imbalance" in the screen driver circuitry that addresses that section of the screen or maybe the panel itself.

In any event, stop looking for it in a short time you will no longer see it. Little flaws like this can ususally only be seen if you specifically look for them. If you stop looking for it, it will disappear

Last edited by tpollagi; 08-26-2015 at 05:17 PM. Reason: Spelling
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post #9880 of 9880 Old 08-27-2015, 08:46 AM
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also my gt50 is buzzing since one year ...
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