VT50 yellow-ish blob on display - AVS Forum
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post #1 of 995 Old 01-01-2013, 12:50 PM - Thread Starter
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I have a VT50 which I've been enjoying since the summer but recently noticed that, while watching Hockey, I can see two small regions on the right and left edges of the screen that have a slight yellow or green tint to them. I probably would never have picked up on it if it weren't for that predominant white of the ice on the screen. It's actually fairly subtle and probably wouldn't translate in a photo but is hard to un-see once noticed. It somewhat reminds me of what my old projection TV looked like when it was on it's last legs. It certainly doesn't bother me as is but am concerned that it may be an indicator of things to come. Any ideas of what that might be?
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post #2 of 995 Old 01-01-2013, 01:09 PM
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Quote:
Originally Posted by newfinator View Post

I have a VT50 which I've been enjoying since the summer but recently noticed that, while watching Hockey, I can see two small regions on the right and left edges of the screen that have a slight yellow or green tint to them. I probably would never have picked up on it if it weren't for that predominant white of the ice on the screen. It's actually fairly subtle and probably wouldn't translate in a photo but is hard to un-see once noticed. It somewhat reminds me of what my old projection TV looked like when it was on it's last legs. It certainly doesn't bother me as is but am concerned that it may be an indicator of things to come. Any ideas of what that might be?

There is a GT50 owner on that thread having same issue I believe.

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post #3 of 995 Old 01-02-2013, 04:46 PM - Thread Starter
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Thanks for the reply. What thread is that in?

Also, I noticed that I don't see this when viewing the break in slides. Odd.
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post #4 of 995 Old 01-03-2013, 07:50 AM
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I believe you are seeing something similar to the "green blob" issue widely reported on panasonic plasmas. I can tell you from my experience with the VT30 that it does not worsen. It does improve slightly after the first few hundred hours. I was never able to get a clear explanation of the issue and I just accept it as a limitation of plasma tech. I find cranking up the contrast reduces issue, but increases temporary IR.
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post #5 of 995 Old 01-03-2013, 10:36 AM
 
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^Maybe Panasonic's implementation of Plasma, but it's not inherent to Plasma itself (I'm saying this as a blob-less Kuro owner).
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post #6 of 995 Old 01-03-2013, 01:39 PM - Thread Starter
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I also have a Kuro and don't see this on it.
I still can't figure out why I don't see the blobs when viewing the slides. It would, seemingly, make sense that the solid colours would highlight the blobs if it were inherent in the tv. Could it be a by-product of the image processing required for rendering the hockey ice? It's a bit confusing.
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post #7 of 995 Old 01-04-2013, 06:48 AM
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What color are your slides? I can see my blobs on grey slides (with low contrast), but not on red, blue or green ones. Your contrast settings may be different between slides and TV. Also, my blobs are less visible when I first power on the TV.


I have an older 2009 panasonic plasma and it also does not have this problem. So more specifically it is a recent (2011, 2012, 2013?) panasonic plasma problem...
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post #8 of 995 Old 01-04-2013, 08:21 AM - Thread Starter
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I'm using the brake-in slides so they cover various shades of basic colours including white, grey, red, green and blue.

It's interesting though that you said that the effect is less obvious when you first power up as that's when I checked it with the slides. I'll have to do that again once it's warmed up for a while. I wonder if it's related to the panel over heating or something along that line.

Again, in my case the effect is very subtle but, apparently, noticeable in very specific circumstances. If it doesn't worsen I'm not concerned. I just wish my wife hadn't pointed it out to me because I would likely have never picked up on it otherwise.
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post #9 of 995 Old 01-10-2013, 08:31 AM - Thread Starter
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So, am I the only one to report anything like this on a VT50?
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post #10 of 995 Old 03-18-2013, 09:58 PM
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Quote:
Originally Posted by newfinator View Post

So, am I the only one to report anything like this on a VT50?

Nope, mine too.

(Also noticing a slight buzz when the screen is white.)
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post #11 of 995 Old 04-30-2013, 08:08 PM
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Watching playoff hockey, I'm noticing it too

Is it IR? Can I run the scrolling bar to get it to go away
Will a professional calibrator be able to lessen these?
I am like the original poster it only seems to be during hockey games is when I notice it
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post #12 of 995 Old 04-30-2013, 10:30 PM
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Just something to double check.

There are some ventilation holes on the back that will sometimes allow light to enter from the back and cause some weird looking blobs on the image on the front side.

If you're using a back light or have light otherwise behind the display, it may be causing this event.

I had a Pioneer plasma for several years before getting the 65VT50. Since I don't like distortion, on occasion I'd run a program in 4:3 aspect ratio. I guess it was the accumulated hours in doing that where the far left and far right areas where the black bars were located would be more blue than the center area. (not yellow). So now, with the 65VT50, I'm careful to zoom in or use the lit side panel feature on my bluray player.

Something else that I recall. During the first few hundred hours, it seems that the outside edge had something of a lighter shade than the rest of the screen. It eventually went away.

When did you get your display and was it new when you got it?

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post #13 of 995 Old 05-01-2013, 04:37 AM
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I got my display in August 2012 from Cleveland plasma, it was brand new

I have it wall mounted and there is no back lighting.....

As I said, it's only during hockey games, but I wonder if there is a way to tweak it away
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post #14 of 995 Old 05-01-2013, 05:01 AM
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billmich,

Is the center mass of the screen during your hockey games greenish or bluish?

Reason I'm asking is if the center mass is a touch greenish, you could add blue and cancel some of the yellow and make the center mass look better to boot.

If it's bluish, you're screwed. If you add blue, you would cancel the yellow on the outside but make center mass too blue. This would be in your grayscale adjustments.

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post #15 of 995 Old 05-01-2013, 05:58 AM
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Define "center mass" please
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post #16 of 995 Old 05-01-2013, 06:20 AM
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I'd consider that the 70% of the picture that excludes the extreme sides, top and bottom.

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post #17 of 995 Old 05-01-2013, 06:42 AM
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To me it doesn't have any type of tint at all,
Certainly not green
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post #18 of 995 Old 05-01-2013, 06:49 AM
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Quote:
Originally Posted by billmich View Post

To me it doesn't have any type of tint at all,
Certainly not green

If you have blobs and they are noticeable during normal content I would be calling Panasonic, imo just playing around with the white balance controls blindly could just make things worse

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post #19 of 995 Old 05-01-2013, 07:18 AM
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Had anyone else had this issue and Panasonic came out and it was fixed?

I only see it during hockey games....
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post #20 of 995 Old 05-01-2013, 07:21 AM
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Quote:
Originally Posted by billmich View Post

Had anyone else had this issue and Panasonic came out and it was fixed?

I only see it during hockey games....

Don't know, sadly the likely result would be they wouldn't do anything, what kind of settings are you using ?

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post #21 of 995 Old 05-01-2013, 08:28 AM
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D-nice in custom slot
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post #22 of 995 Old 05-01-2013, 08:29 AM
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I was planning on having Chad B calibrate my set sometime in July or August but this may not be a calibration type of fix
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post #23 of 995 Old 05-01-2013, 08:29 AM
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Quote:
Originally Posted by billmich View Post

D-nice in custom slot

Could be abl rearing its ugly head

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post #24 of 995 Old 05-01-2013, 08:30 AM
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Quote:
Originally Posted by billmich View Post

I was planning on having Chad B calibrate my set sometime in July or August but this may not be a calibration type of fix

He is a master might be able to reduce it somewhat

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post #25 of 995 Old 05-01-2013, 08:47 AM
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Abl?

I actually noticed first back in November
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post #26 of 995 Old 05-01-2013, 08:51 AM
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Quote:
Originally Posted by chunon View Post

He is a master might be able to reduce it somewhat

I've heard he is top notch
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post #27 of 995 Old 05-02-2013, 07:46 AM
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I too have this yellowish green blob on the right side of my 55vt50. It's very noticeable in commercials with solid white backgrounds such as apple and others. I did notice it in a hockey game last night as well. Has anyone determined the cause and how the issue can be resolved?

I bought from best buy last September and my tv is mounted on the wall.
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post #28 of 995 Old 05-03-2013, 02:47 PM
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Is there anything a calibrator can do to minimize this?
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post #29 of 995 Old 05-12-2013, 12:19 PM
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I believe I'm seeing it as well, hence my search for VT50 yellow blob that sent me to this thread. I'm seeing in during all-white or near white images. Mine is located along the left side of the panel, above the horizontal mid line. Not noticing it right now while I'm watching the PGA championship but I've seen it during commercials and if I run white or grey slides. My set is professionally calibrated and I'm currently running ISF Day.

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post #30 of 995 Old 05-12-2013, 09:37 PM
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For me, I only notice it during hockey games
Which for all practical purposes is like running a white slide
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