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Dirty Screen Effect on a GT25 Plasma (Is this still an issue today?)

post #1 of 16
Thread Starter 
So my new GT25 has the dirty screen effect. That is lighter coloured bands both vertically and horizontally that can been seen on lighter colored slides and in panning sceens when there is alot of one color. Watching hockey really brings this out, or panning the sky in a video game.

Is this normal on todays plasmas or should I be returning this set? Here is a pic of what I am experiencing. This is from an LCD though I used to own cause my plasma doesnt show it well on pics, but it is along the same line as what you see in the pic, but fainter.




Now the camera pics this up a little better than ones eyes, but that is the basic idea of it. Should I be returning this set or would the next one be just as bad?
post #2 of 16
Thread Starter 
So I take it nobody else has anything of the sort?
I just got done reading a thread where it plagued the kuro plasmas. After doing a search in the gt/g series threads, it yielded no results so would it be safe to say it is defective?

Keep in mind, that pic was with contrast and brightness cranked so it showed it better. In normal circumstance it is not as bad as the picture would indicate.
post #3 of 16
Quote:
Originally Posted by b_rad4 View Post
So I take it nobody else has anything of the sort?
I just got done reading a thread where it plagued the kuro plasmas. After doing a search in the gt/g series threads, it yielded no results so would it be safe to say it is defective?

Keep in mind, that pic was with contrast and brightness cranked so it showed it better. In normal circumstance it is not as bad as the picture would indicate.
I've heard some reporting banding etc running slides, I have yet to see it on my GT25 then again not really looking for it. My advice would be to see if it bothers you after breakin with normal settings and then decide one way or the other.
post #4 of 16
Thread Starter 
I see alot of views so I am going to assume that it is intact a defect. I will take my slides and check out some display models and see if I can replicate it there. I'll show them my pic so they can see it for themselves.
post #5 of 16
I had no idea plasmas had this problem. I would not accept this, and would take it back.

Michael
post #6 of 16
Thread Starter 
i tested 5 diferent Tvs, 50gt25, 50g25, 55st30, 55gt30, 50vt25 at the store and they all had uneven bars, they easiest place to see them is by using the IR screen wipe bar, as it pans across the screen horizonitily you can see the uneven spots on the white bar. though I could also see on certain slides, particu;arily gray, white and green. So I guess they all have it. I am just very sensitive to it. Though the guy at the store saw them too after I pointed them out. I then went to Sears where they had a VT25 and it had it as well.

Should have checked out the Samsungs as well just to see if they had it too.
post #7 of 16
Quote:
Originally Posted by b_rad4 View Post

i tested 5 diferent Tvs, 50gt25, 50g25, 55st30, 55gt30, 50vt25 at the store and they all had uneven bars, they easiest place to see them is by using the IR screen wipe bar, as it pans across the screen horizonitily you can see the uneven spots on the white bar. though I could also see on certain slides, particu;arily gray, white and green. So I guess they all have it. I am just very sensitive to it. Though the guy at the store saw them too after I pointed them out. I then went to Sears where they had a VT25 and it had it as well.

Should have checked out the Samsungs as well just to see if they had it too.

Hmmmm so you are basing your analysis on what you see on the IR wipe bar ? How does that translate to real world tv viewing ?
post #8 of 16
Thread Starter 
Quote:
Originally Posted by chunon View Post

Hmmmm so you are basing your analysis on what you see on the IR wipe bar ? How does that translate to real world tv viewing ?


The only time I have really seen it so far was while watching hockey when the action in panning from end to end. I can also see it in games that have a free moving camera and I pan across the sky. Watching blu rays haven't really seen it, or tv other than hockey.

Again I can see it on slides but is very faint, nothing near as strong as the picture indicates. I had to mess with iso on my camera to even get it to show up with brightness and contrast cranked.
post #9 of 16
Quote:
Originally Posted by b_rad4 View Post

The only time I have really seen it so far was while watching hockey when the action in panning from end to end. I can also see it in games that have a free moving camera and I pan across the sky. Watching blu rays haven't really seen it, or tv other than hockey.

Again I can see it on slides but is very faint, nothing near as strong as the picture indicates. I had to mess with iso on my camera to even get it to show up with brightness and contrast cranked.

So I guess it all comes down to whether it is something you can live with then
post #10 of 16
Thread Starter 
Chaccked out some more today, including Samsungs this time at best buy and low and behold they all had it. I can't believe more people are not complaining about it. I am just hoping I grow used to it. I was think while driving, there were huge streaks on my windshild I never notice while driving, but they stick out like a sore thumb, so I hope this issue will become zoned out like the streaks on my wind shield.
post #11 of 16
I had a similar issue with my Australian Panasonic P50V20A, which I went into full detail in this thread on another forum:

http://www.dtvforum.info/index.php?showtopic=93365

Basically my problem was more to do with the actual screen filter, resulting in at least three prominent dark vertical bands you could see even when the screen was off. When the TV was on you could definitely see lighter patches between the dark bands, so effectively it had the same impact as DSE, giving several light vertical bands, most noticeable on panning scenes.

Anyway long story short I got the TV replaced under warranty. Panasonic Australia accepted this as a fault and since it was a panel fault, the policy is to replace the entire TV.

My new TV has quite good uniformity now, no banding or clouding visible as such. I used solid color slides to test that thoroughly both when I got the new TV, and about a month afterward in case things changed. It should not be acceptable for a plasma to have uniformity issues resulting in banding or other glitches, especially if they're actually noticeable under normal viewing circumstances.
post #12 of 16
Quote:
Originally Posted by b_rad4 View Post

Chaccked out some more today, including Samsungs this time at best buy and low and behold they all had it. I can't believe more people are not complaining about it. I am just hoping I grow used to it. I was think while driving, there were huge streaks on my windshild I never notice while driving, but they stick out like a sore thumb, so I hope this issue will become zoned out like the streaks on my wind shield.

I often wonder the exact same thing. How do people not complain more about this?

I recently bought an ST30 after being frustrated by vertical/horizontal banding in LCD sets. I kept hearing that plasmas have "perfect uniformity". Which sounded like music to my ears. Upon getting the ST30 home I saw exactly what you noticed. The anti reflective coating they put on these tvs shows up on plasmas in the form of these bands. Plasmas do have perfect backlight uniformity.

I've come to the conclusion that most people just don't notice a lot of the flaws today's TV's have. Manufacturers have no reason to do anything different if the vast majority of people don't complain.
post #13 of 16
Quote:
Originally Posted by Tigerriot View Post

I often wonder the exact same thing. How do people not complain more about this?

I recently bought an ST30 after being frustrated by vertical/horizontal banding in LCD sets. I kept hearing that plasmas have "perfect uniformity". Which sounded like music to my ears. Upon getting the ST30 home I saw exactly what you noticed. The anti reflective coating they put on these tvs shows up on plasmas in the form of these bands. Plasmas do have perfect backlight uniformity.

I've come to the conclusion that most people just don't notice a lot of the flaws today's TV's have. Manufacturers have no reason to do anything different if the vast majority of people don't complain.

I think it all comes down to whether you use break in slides it is obviously more apparent when using them. My question would be what effect this has on normal viewing content. I own the GT25 and have yet to see anything I would consider a major picture flaw.
post #14 of 16
Thread Starter 
So I ended up taking the GT25 back cause I found an amazing deal on the VT for just $200 more! I couldn't believe it! I priced matched it. So for 200 more I got a significantly better tv and a pair of 3d glasses. It was the same price as they had the 50st30 on which is nuts, I guess they just want to clear them out.

The bands are still there but I have decided it's something I am going to have to live with, but I am thrilled at this deal.
post #15 of 16
my PF10 had some when I first owned it (about 1 year oldwhenI bought it - 1k hours or so on it) -after a further 6 months or so its completely gone

it was only noticeable on very pale skies and horizontal pans - but was annoying none the less
post #16 of 16
This thread just stopped me from going insane.

My new Panasonic TCP55GT30 is amazingly awesome. However, when I watch hockey in HD, I can see this effect, particularly on 1/2 vertically oriented spots/bands. I've only had the TV for about 6 weeks but I haven't seen this effect on anything other than hockey. I have not done any fancy calibrations or anything of that sort.

I'll keep an eye on it and see if it gets better or worse and maybe take some screencaps. I have an extended warranty through Paul's TV in any case so if something else comes up after a year I'll probably be getting a newer model replacement anyways.
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