VT50 yellow-ish blob on display - Page 34 - AVS Forum
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post #991 of 1016 Old 06-09-2014, 03:39 AM
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One more added point. My improvement is still holding up very well after surgery, but I always view THX cinema calibrated and when I check calibrated pro the blobs are good also. This means that if I can still see a hint on normal mode then calibration can be of some benefit.
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post #992 of 1016 Old 06-23-2014, 07:49 PM
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After 2 weeks on the ECO/Energy Saving mode, I can report that it does help to significantly reduce the yellow blob on both sides. With ECO/Energy Saving off, the blobs would catch my attention on every high APL image. Now, I don't really see the blobs unless I actively look for them. For my next re-calibration, I intend to do so with ECO/Energy Saving turned on.

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post #993 of 1016 Old 06-25-2014, 01:45 AM
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Originally Posted by stash64 View Post
After 2 weeks on the ECO/Energy Saving mode, I can report that it does help to significantly reduce the yellow blob on both sides. With ECO/Energy Saving off, the blobs would catch my attention on every high APL image. Now, I don't really see the blobs unless I actively look for them. For my next re-calibration, I intend to do so with ECO/Energy Saving turned on.
Stash64 very cool thinking. I wonder what exactly the Eco mode does. Apart from adjusting contrast automatically depending on ambient light.

It could somehow reduce other energy resources taking heat away from the panel. I don't know but well done on bringing new thoughts to this thread
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post #994 of 1016 Old 06-25-2014, 05:54 AM
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Originally Posted by Crudesinger View Post
Stash64 very cool thinking. I wonder what exactly the Eco mode does. Apart from adjusting contrast automatically depending on ambient light.

It could somehow reduce other energy resources taking heat away from the panel. I don't know but well done on bringing new thoughts to this thread
If my blobs come back on the new panel (hoping not) I'll give this a try!

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post #995 of 1016 Old 06-25-2014, 08:43 AM
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Quote:
Originally Posted by Crudesinger View Post
Stash64 very cool thinking. I wonder what exactly the Eco mode does. Apart from adjusting contrast automatically depending on ambient light.

It could somehow reduce other energy resources taking heat away from the panel. I don't know but well done on bringing new thoughts to this thread
I don't think it is dependent on ambient light. I think it just rolls off the brightness/contrast on high APL images. Another side benefit that I noticed from the very beginning is that board "buzzing" is also reduced. I did use the ECO Energy Saving during the first couple months with my VT50 for break in and also because I am sensitive to the buzzing, but I ended up calibrating with Energy Saving turned off.

Overall, I really prefer the reduced brightness under high APL. The picture seems to have more depth and blacks appear blacker, even with moderate APL images.

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post #996 of 1016 Old 08-13-2014, 03:00 AM
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I know this thread is a bit dead, but here I go. I think the sanest people here don't even have the VT50 anymore, haha.

Recently I bought a second hand 1.5 year old 55VT50E(not knowing about the defects). I come from a cheap ass 5/6 year old LG plasma, which worked perfectly throughout these years. But it was time for something better(at least picture quality wise). I am a real plasma guy, because even my cheap LG did better in colours than all of the LCD's I’ve seen.

I read reviews about the VT50 and it was the best image you could get, two years ago, since the Kuro. (paying more than 1500 for a set was a bit to much for me, that’s why I looked on the second hand sites)
Once I had the TV, I watched in THX Cinema mode (it looked to be the best image) and was blown away by the beautiful image. This TV had 3600 hours on it (I checked in the service menu)
I am not at al a nit picker(I’m not even going to let it be calibrated). But then I noticed the piss coloured blob on the right side of the screen when I was watching Google's white screen.
Of course the first good forum I found was AVS and this thread. I've almost read it all and came to the conclusion that calling Panasonic was the best idea. I contacted the service guys here in The Netherlands that take care of the warranty business and had to send pictures of the blob etc. Here in the Netherlands you get a full 2 year warranty on the sets (if i'm not wrong.) Then Panasonic had concluded they would do a full retail price refund. :PPPP Which will give me a profit of 1200 Euro's, so I'm not complaining.

My next endeavour was to buy another 55VT50 on a second hand site. I bought one from a dude who said he had a company and that I will have a one year warranty on the set. The price was 1000 Euro's. I even got a receipt from this guy, like he had a company (which wasn't so, I checked later), I also found out the TV didn't have a serial number on the back (the sticker). So I felt a bit f#cked over.
But I accepted the TV because it was for free anyway

But I found out it had a yellow blob also. But not anywhere as big and pronounced as the previous model I owned (not even half as bad). This TV had only 1600 hours on it. The guy told me it was a demo in a store (and I think I believe him, because of the low mileage and a little bit of burnt-in logo of a music channel, which is not visible from a distance).

So I thought, if I don't have a warranty on it and the TV is for free, I might just make some mods on it. I took an old fan from my computer PSU, it's a good fan for it, because it has a very low initial spinning voltage. I connected the fan to the wires of the fan on the right of the TV (when you are in front of the TV). I chose this fan, because it was also a bit whiny.
I put a pot-meter in front of both fans, drilled a hole in the back to put it there.
The sound is not that bad, it's now more the replacement of air rather than mechanical fan noise.
(see photo)

Before the fan installation, I put the TV's VSUS setting to HIGH and noticed a decline of the blob. It seems to appear after 20 seconds or so. But after installing the fan, I could even put the TV back to LOW and the blob almost does not appear. I even can feel with my hand the TV is almost everywhere cold to the touch (where the blob used to be). Only the lower section of the initial blob size it still feels warm. And that is also the only place the blob still appears after some time (not as pronounced as initially).

Question 1: scirica, are you still having no blob on your set?
Question 2: I've read almost the whole thread, but I noticed a decline in mentioning the VSUS pot-meter at the end of it. Is after all this time, the mod still working for you guys who have fiddled with it?

Question 3: Let's say I am to fiddle with the pot-meter to (almost) completely get rid of the blob, how much do I turn it and how. (yes I've read the thread, but I don't know what 10-4 etc means :PPP)w
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post #997 of 1016 Old 08-14-2014, 05:32 PM
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My blob issue was corrected by the panel exchange. Now, with a few thousand hours on the new panel I THINK I'm seeing a slight return of the dreaded blobs, but it is barely noticeable. I'm going to just enjoy my VT50 and not worry about it!


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post #998 of 1016 Old 08-22-2014, 01:13 PM
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Hi Tennie,

Update from my situation updated. A couple of days ago I returned my VSUS to low. I had also been one of the members here who had raised in the service menu and with Pots in the back.

I am Glad to report the blobs are almost completely gone on low setting. I always wondered if programmed voltage increases would kick in on top of our voltage raises.

I have 5800 hours now. Of course I still have my pots tweaked just right from earlier to improve blobs but not cause blue sparkles.

In addition the overall screen uniformity has really improved with this many hours when it comes to top and bottom of the panel pink tinge. Eg snow or clouds.

I still have the light patches in blob areas on the pro mode black screen. On THX calibrated which I watch no problem here. MLL is now 20% better on VSUS low at these hours. Before I couldn't measure difference.

Never the less the best picture I have had so far and glad to have stuck it out.
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post #999 of 1016 Old 08-22-2014, 02:52 PM
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Quote:
Originally Posted by Crudesinger View Post
Hi Tennie,

Update from my situation updated. A couple of days ago I returned my VSUS to low. I had also been one of the members here who had raised in the service menu and with Pots in the back.

I am Glad to report the blobs are almost completely gone on low setting. I always wondered if programmed voltage increases would kick in on top of our voltage raises.

I have 5800 hours now. Of course I still have my pots tweaked just right from earlier to improve blobs but not cause blue sparkles.

In addition the overall screen uniformity has really improved with this many hours when it comes to top and bottom of the panel pink tinge. Eg snow or clouds.

I still have the light patches in blob areas on the pro mode black screen. On THX calibrated which I watch no problem here. MLL is now 20% better on VSUS low at these hours. Before I couldn't measure difference.

Never the less the best picture I have had so far and glad to have stuck it out.
Glad to hear that. My replacement panel has several thousand hours on it now and it still looks very good with minimal "blobs". More like a couple of "hot spots" on the right hand side where one of the original blobs was, but even this is not noticeable with video content playing. It is good to know that if necessary I can consider setting the twin pots manually at some point.

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post #1000 of 1016 Old 10-01-2014, 10:08 AM
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Pee stains

Hi all. I've been following this thread for a few months. Noticed the pee stains on my 65vt50 towards the beginning of the summer. Unfortunately I purchased the set October 2012 so panasonic probably would not be any help.

Luckily I purchased the tv using my amex so I filed a warranty claim last week. Had the authorized panny repair person document the tv was defective and could not be repaired, since the panels are no longer available.

Received an email from amex this morning indicating I would be refunded the cost of the tv and the repair visit.

I honestly wish they could just repair or replace the panel because I loved the pictureon this tv. It's my understanding that there's really no satisfactory replacement for a plasma these days so that's very disappointing.

I will likely try the voltage-match fix and pop a few fans on to see if that helps. Hopefully it will work well enough until there are some good oled sets available. Thanks for reading and please let me know if you've satisfactorily replaced your plasma with something widely available!
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post #1001 of 1016 Old 12-08-2014, 08:35 PM
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I bought a 65VT50 in October 2012. About 4 months ago, I started noticing blobs on both the left and right edges of the screen at the midline. With no extended warranty, I presume I'm pretty much stuck with what I have. Also, it seems like no precise cause has been identified.

I've been buying plasma TVs from Panny for years now, and I am very disappointed to see that some of their products are flawed in such a way (especially considering the cost of the higher end models).
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post #1002 of 1016 Old 12-09-2014, 06:44 AM
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got an ISF calibration, this has reduced the blobs to invisible for me
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post #1003 of 1016 Old 12-09-2014, 06:57 PM
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I've only caught a whiff of the blob issue on occasion now, not anything that makes me cringe and it always seems to be in daymode during cable broadcasts. I'm about due for another Dnice calibration and will get one if I don't replace this set this next year with an OLED.
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post #1004 of 1016 Old 12-10-2014, 01:29 AM
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I have a st50 and after I got it, I set the settings D-nice showed over at hdj (for the non d-nice slide instruction settings). I started to notice the blobs in the upper left and right hand side of the set. I did not see this when I purchased the set; I used various slides, movies and tv content to view the set characteristics prior to buying.


I read through this entire thread and changed the vsus in the SC, but still saw the yellow patches. there was one single post that stated changing the temperature cured his blobs and I went to check the settings. the poster that mentioned his temperature was changed from "warm 1 to normal." sure enough, D-nice settings called for warm 2. I changed the setting to normal and the yellow patches are 99% gone - I have to strain to see anything at all. I think that last 1% is the psychological damage caused by my being ingrained to see these things and no matter what and I stare at the spot(s) to actually look for the damn things!


the BAD thing about figuring this out was that I was in the process of buying a 60" F8500 from BB online and was somewhat sidetracked staring at the tv for the yellow patches; the sets sold out for the time being! grrrr....and this was at 12.15am. when that last set must have sold (the thing was in my cart and my session timed out!).


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post #1005 of 1016 Old 12-10-2014, 09:09 AM
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Is your color temperature messed up now or did you re-calibrate to D65 ?

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post #1006 of 1016 Old 12-10-2014, 09:12 AM
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This probably won't go over well, but I actually think my parent's ST30 is a better overall TV than my VT50. No blobs, no buzzing, no fan noise. It also has better screen uniformity... something that normally is not an issue with plasmas but is an issue with the VT50 because of the blobs.

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post #1007 of 1016 Old 12-10-2014, 09:39 AM
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The '30' series had it's own issues and overall the '50' series was considered a vast improvement
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post #1008 of 1016 Old 12-10-2014, 09:50 AM
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Quote:
Originally Posted by stash64 View Post
This probably won't go over well, but I actually think my parent's ST30 is a better overall TV than my VT50. No blobs, no buzzing, no fan noise. It also has better screen uniformity... something that normally is not an issue with plasmas but is an issue with the VT50 because of the blobs.
The cheaper ST series doesn't have the light filter that the VT series has. Some of the slight (and I mean slight) uniformity you could poke at is likely due to that filter. As to PQ, its going to be better with the filter than without.
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post #1009 of 1016 Old 12-10-2014, 02:52 PM
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Quote:
Originally Posted by thesharkman View Post
I have a st50 and after I got it, I set the settings D-nice showed over at hdj (for the non d-nice slide instruction settings). I started to notice the blobs in the upper left and right hand side of the set. I did not see this when I purchased the set; I used various slides, movies and tv content to view the set characteristics prior to buying.


I read through this entire thread and changed the vsus in the SC, but still saw the yellow patches. there was one single post that stated changing the temperature cured his blobs and I went to check the settings. the poster that mentioned his temperature was changed from "warm 1 to normal." sure enough, D-nice settings called for warm 2. I changed the setting to normal and the yellow patches are 99% gone - I have to strain to see anything at all. I think that last 1% is the psychological damage caused by my being ingrained to see these things and no matter what and I stare at the spot(s) to actually look for the damn things!


the BAD thing about figuring this out was that I was in the process of buying a 60" F8500 from BB online and was somewhat sidetracked staring at the tv for the yellow patches; the sets sold out for the time being! grrrr....and this was at 12.15am. when that last set must have sold (the thing was in my cart and my session timed out!).


thesharkman
What you did is make the display a bit bluer which masks the yellow. However, it is now further from the proper white balance calibration. If you were to recalibrate it, the yellow will likely start showing up a bit more.

My 55ST50 is still sitting in my basement covered, we're just shy of a year of when I first started noticing the issue and 11 months from when I replaced it with a Sony W900A. Every so often I get the itch to start tinkering with it. The urge to pull the back off and start messing with the vsus via the POTs to see if I could smooth out the blobs pops up every now and again. I also own a meter and software now and could see if a careful calibration hides them. Finally, I thought about just running up the hours on the TV using slides to see if a natural shift in voltage would make them fade.

So far though, I haven't done anything with it. I'm not even 100% sure I would swap it and the Sony if I got it back into acceptable order. Blacks (and thus contrast) are better on the ST50 as are the viewing angles and I wouldn't have to worry about flashlighting, but then I would have to start worrying about IR again and have to endure line bleed. Motion is better on the Sony too. It's a tough call.
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post #1010 of 1016 Old 12-11-2014, 03:40 PM
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Originally Posted by bull3964 View Post
What you did is make the display a bit bluer which masks the yellow. However, it is now further from the proper white balance calibration. If you were to recalibrate it, the yellow will likely start showing up a bit more.

My 55ST50 is still sitting in my basement covered, we're just shy of a year of when I first started noticing the issue and 11 months from when I replaced it with a Sony W900A. Every so often I get the itch to start tinkering with it. The urge to pull the back off and start messing with the vsus via the POTs to see if I could smooth out the blobs pops up every now and again. I also own a meter and software now and could see if a careful calibration hides them. Finally, I thought about just running up the hours on the TV using slides to see if a natural shift in voltage would make them fade.

So far though, I haven't done anything with it. I'm not even 100% sure I would swap it and the Sony if I got it back into acceptable order. Blacks (and thus contrast) are better on the ST50 as are the viewing angles and I wouldn't have to worry about flashlighting, but then I would have to start worrying about IR again and have to endure line bleed. Motion is better on the Sony too. It's a tough call.

funny that you mention this. before I changed the temp, I ran some of the black and white screen wipes and stared at the two areas where I saw the yellow and didn't see any (while the white was running across the screen of course). i thought that the vsus change had done the job by itself.


in any event, the pq is still great ....


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post #1011 of 1016 Old 12-11-2014, 04:30 PM
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Those of you who are new to this thread might want to go back about a year and read the post about attaching external fans to the areas that are shifting yellow.

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post #1012 of 1016 Old 12-12-2014, 12:10 AM
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Those of you who are new to this thread might want to go back about a year and read the post about attaching external fans to the areas that are shifting yellow.
jim,


thx. I did see your post. would you mind posting a photo of how you have the fan and p/s hooked up to the back of the set? I saw the links you posted, but really couldn't picture in my mind's eye how they would be set up. thx.


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post #1013 of 1016 Old 12-12-2014, 05:26 AM
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I moved the display to my bedroom and have not put the fans back on. Where it use to get roughly 10 hrs a day use, I go many days where it doesn't get used at all. Then maybe only an hour or two when it does get used.

Also, I was doing it preemptively. I didn't actually have the yellow blobs but as a worry wort wanted to put the fans on.

It does seem that at least one other person posted pictures showing their fan arrangement.

I did calibrate it yesterday and have to say a big wow. This VT50 is much more linear than my Samsung F8500. (better blacks too) To get equal (or slightly better) results with the Samsung, I have to do a 3D LUTs calibration using something like 3600 measurement points.
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I tried the VSUS mod in the service menu, changing it from LOW to HIGH. I've kept ECO/Energy Saving engaged to hopefully keep buzzing and heat output down. Happy to report it did clear up my blobs on both sides. So far I don't see any yellow on either side. On the down side, I do see a little bit of "sparkliness". I also noticed immediately that a horizontal bar that appeared mid screen created a visible horizontal "flare" on both sides of the bar.

Are there any other down sides that I should expect, such as increased black level ? Will the high setting reduce panel life ?

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post #1015 of 1016 Old Today, 08:46 AM
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Upon closer scrutiny, I do still see some yellow discoloration but only on the right side. I would say that it is close to 75% reduced, although it was more noticable when running my HTPC versus just watching TV.

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At the end of the day, it's panel damage/uneven wear caused by the heat of the circuit boards immediately behind those areas. Increasing VSUS either by the service menu or though manipulation of the POTs has shown to decrease or eliminate them likely due to overcoming the misfiring due to heat damage.

Any other change likely just masks them by de-emphasizing yellow or lowering the output of the display in some way.

This was obviously a known issue at Panasonic as they took steps for further thermal mitigation in the 60 series TVs.

I would expect nearly every 50 series TV to eventually succumb to this in one way or another depending on use patterns. It may not be immediately visible in all environments, but the damage is likely there.
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