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VT50 yellow-ish blob on display - Page 6

post #151 of 964
Has anyone who has done the VSUS tweak tried recalibrating their set? Just wondering if it's necessary, Buzz is in my town for the summer, might have to have him swing over and calibrate for me.
post #152 of 964
Tried taking the back off the tv today to further tweak the VSUS. I could completely eliminate the blobs but ran into the issue of developing blue sparkles where the blob used to be. Turned it back to original position (two trimpots on power supply) and will do some more research on the issue.
post #153 of 964
Quote:
Originally Posted by jp0213x View Post

Do you meaning lowering the contrast through the reg setting menu or in the hidden menu? I did lower my contrast from the regular menu a bit.
Yes, through the regular menu.

Quote:
Originally Posted by chadwick537 View Post

Has anyone who has done the VSUS tweak tried recalibrating their set? Just wondering if it's necessary, Buzz is in my town for the summer, might have to have him swing over and calibrate for me.
I'll take some measurements within the next couple weeks and compare them to my old measurements.

How much are you able to further decrease the blobs with trim pot adjustments while avoiding artifacts?
post #154 of 964
THard to say - we had the blobs essentially gone (couldn't see any during hockey replays) and thought the issue was fixed. We essentially paused a scene where the blobs were noticable, turned tv off, tweaked trimpot, turned tv on. Repeat til they were gone.

However, after putting the back on and watching tv tonight the artifacts appeared. This had to be 30+ minutes into viewing. Strange indeed.
post #155 of 964
I suppose I should pull out the WOW disc and do a quick contrast and brightness check.
post #156 of 964
Quote:
Originally Posted by chadwick537 View Post

Tried taking the back off the tv today to further tweak the VSUS. I could completely eliminate the blobs but ran into the issue of developing blue sparkles where the blob used to be. Turned it back to original position (two trimpots on power supply) and will do some more research on the issue.

Using a meter, you need to verify if you are increasing or decreasing VSUS, as I think it should be an increase.
post #157 of 964
TWe had a meter but were unable to find where to take a reading, nothing on the power supply board other than the l/r trimpots were labeled VSUS. We found something labeled VSUS TSP on the boards to the l/r of the power supply board but didnt get any readings when touched.
post #158 of 964
Can you post a picture of your power supply, as well as the SC and SS boards? The SC is on the left, it's a large board, SS is on the right.
post #159 of 964
Yes, I'll try to soon. I'll have to take it off the wall and take the panel off, etc.
post #160 of 964
Hey guys, I posted a few weeks back that I had the same issue as everyone else in this thread with the yellow blob. I figured I'd give an update to my VT50's status. Since I posted three weeks ago, I've also noticed a yellow blob on the left side as well. Originally I only noticed the right side. Again, its only perceivable on bright, or all white screens. Last night, however, I noticed something new. I rarely watch TV in complete darkness, but last night I did and I noticed that when the screen is completely black, there are white blobs in the same spots as the yellows. Now just like the yellow blobs they are barely noticeable, but definitely there. I was wondering if anyone else has had this problem as well? I'm going to be giving Panasonic a call this coming Monday since I'm still under warranty and the problem isn't getting any better.
post #161 of 964
Are you sure the white artifacts you're seeing on a black background isn't just light getting through the rear of the set and being projected on the panel? I have a window directly behind my set and during the day I have to set the blinds at a certain angle to block out the downward light and cancel out spots on my TV. I have an LED strip all around the rear of my TV for nighttime bias lighting but it doesn't cause any problems; only light at certain angles gets through certain crevices and the empty threaded mounting holes around the circuit panels. You can see all these areas by looking through the vent holes at the top-rear of your TV.
post #162 of 964
Yeah, I checked for that before with the yellow blobs. My TV is about a foot from the back wall. The room I was watching in last night was very dark, so the white clouds couldn't be light coming through. I'll stress, though, that they weren't very bright, so they're hard to see. It could possibly just be in my head, but I know the yellow is definitely there.

Edit: I should mention that I had the TV on most of the day yesterday, and even with A/C on it was warm in my apartment. I live in the Northeast and we're in the 90's right now. I'm only mentioning this, because the yellow spots aren't noticeable until the TV warms up a little.
Edited by DirtyWolverine - 7/5/13 at 11:20am
post #163 of 964
Now that hockey is over, I really wonder if I should even get into that service menu and change the setting
I mean I don't notice any discoloration during baseball or other sports or even my regular primetime shows but in the back in my head I know it's still there

any thoughts?
post #164 of 964
I go back and forth myself. Chad did his test with VSUS on High and told me the light out put change was minimal, so I don't have to bother with changing brightness or contrast. I do like his calibration and may just leave VSUS on Low and use my calibrated specs.
post #165 of 964
Isn't the low setting where this blob shows up and the high setting is where they go away?

Why would you leave it on the low setting?
I thought we want to switch it to the highest setting to get rid of the blob, what other calibration settings might be affected by this change?
post #166 of 964
Yes
Quote:
Originally Posted by billmich View Post

Isn't the low setting where this blob shows up and the high setting is where they go away?

Why would you leave it on the low setting?
I thought we want to switch it to the highest setting to get rid of the blob, what other calibration settings might be affected by this change?
,

Yes. High minimizes the blobs. Minor add'l light output according to Chad B's recent test, no effect on CMS. Possibly affects ABL. He indicated I probably didn't even need to adjust my brightness and contrast on my calibrated set.
post #167 of 964
But does any other settings needs to be adjusted like gamma and white balance
post #168 of 964
Hi,

I have an NZ version VT50. I too have the lighter blobs on the dark image in the same place as the yellow blobs. This is noticeable and very measureable. On the NZ VT50 our pro modes 1,2 are locked in low panel brightness. There is no panel brightness setting to adjust to mid. On this setting the blacks are double the MLL(0.02cd/m2) compared to THX cinema( 0.01cd/m2) for starters. Measured on 0 IRE on AVS709 full black

The light blobs on pro1,2 are far worse at MLL(0.05cd/m2) THX cinema blobs measure (0.02cd/m2). Overall about double the starting MLL in the middle of the screen. This is measured in total darkness.

This is so noticeable on our NZ pro picture modes I have given up on them totally.It is very noticable in normal content. Even after I invested in an I1display OEM and learned quite a bit about DIY calibration, I could not fix it.

I wonder if you checked your panel bightness low setting if you have a USA model you might see the dark screen blobs much brighter as I see them? Could these blobs be related to a voltage issue also on dark content. If VSUS drives the full white background is there a tweak for a full black one?

If this information springs any new thoughts on the cause or remedy it would be great.
post #169 of 964
Glad to hear that I'm not the only one who has the lighter blobs on a dark screen. I haven't tried turning the panel brightness to low, but tonight I'll take a look. I'm going to be giving Panasonic a call today and will be mentioning the lighter blobs along with the yellow ones. If they are able to come up with any fix rather than replacing the panel I'll be sure to post it here.
post #170 of 964
Wow. How long have you guys seen your light blobs on dark backgrounds? This is the first time I've heard about this phenomenon.

I see no light blobs on dark backgrounds on my UT50 with VSUS at either low or high. I do not have a panel brightness setting in the standard menu, which your VT50s seem to have, for whatever that's worth. Perhaps these blobs are related to whatever circuitry is responsible for that setting (if that setting is having an effect on your blobs).
post #171 of 964
Assuming most of you have the 65 incher ? Has anyone seen this on a 55 " ?
post #172 of 964
I have the 65 inch VT50. I'm not sure how long I've had the light blobs since i rarely watch TV in a completely dark room. I noticed them for the first time this weekend. Could be they've been there since the yellow blobs started. I just got off the phone with Panasonic and have an appointment next week for a service tech to look at the screen.
post #173 of 964
Quote:
Originally Posted by DirtyWolverine View Post

I have the 65 inch VT50. I'm not sure how long I've had the light blobs since i rarely watch TV in a completely dark room. I noticed them for the first time this weekend. Could be they've been there since the yellow blobs started. I just got off the phone with Panasonic and have an appointment next week for a service tech to look at the screen.

I am hoping it is unique to the 65" panels, probably wishful thinking, did you try the vsus fix ?
post #174 of 964
No, I haven't tried the VSUS fix. I'm still under warranty, so I figured I'd let them handle it. I know I can try it and Panasonic wouldn't know, but my fear is it could get worse with time. It took seven months for the problem to show up. What if in another six months or so it gets worse and the VSUS fix doesn't mask it anymore? If i was out of warranty I'd try it, though.
post #175 of 964
Quote:
Originally Posted by DirtyWolverine View Post

No, I haven't tried the VSUS fix. I'm still under warranty, so I figured I'd let them handle it. I know I can try it and Panasonic wouldn't know, but my fear is it could get worse with time. It took seven months for the problem to show up. What if in another six months or so it gets worse and the VSUS fix doesn't mask it anymore? If i was out of warranty I'd try it, though.

Probably smart I am cringing keeping my fingers crossed that it doenst develop on my set because I truly love it
post #176 of 964
Quote:
Originally Posted by DirtyWolverine View Post

I have the 65 inch VT50. I'm not sure how long I've had the light blobs since i rarely watch TV in a completely dark room. I noticed them for the first time this weekend. Could be they've been there since the yellow blobs started. I just got off the phone with Panasonic and have an appointment next week for a service tech to look at the screen.
post #177 of 964
Quote:
Originally Posted by Crudesinger View Post


Good luck with Panasonic. The response they gave me is that the set had nothing wrong with it and was within specification and not a warrantee issue. Other than yellow I also have pink. They tested another 65vt50 of their own and found the same white screen and dark screen issues. The conclusion they gave me was that this meant it was normal. They also suggested that I would see no improvement from a replacement, and possible worse and if I wanted a perfect screen I should purchase a professional display.
post #178 of 964
You are obviously talking to the wrong people at Panasonic..

FAIL on their part
post #179 of 964
I will now be trying the VSUS tweak as I don't have much to loose given Panasonic NZ response. I will report back on the result.

Thanks very much for the tip
post #180 of 964
I also have some pink/purple around the edges of the screen which I told them about, but since no one else has mentioned that in this thread I figured it was unrelated to the yellow/white blob. I'm swimming with confidence in Panasonic warranty now, haha.
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