Faint ghosting lines on plasma - AVS Forum
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post #1 of 38 Old 12-17-2006, 04:14 PM - Thread Starter
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When an image of a black frame is displayed in the middle of the screen, I would see very faint ghosting image of the top and bottom frames extending to the edge of the screen horizontally. I notice this when I play games using s-video, especailly under save menu in RPG games with light background. My TV is Panasonic TH42PX60. Anyone else having the same problem?
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post #2 of 38 Old 12-17-2006, 04:45 PM
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This could be a ground loop problem. Are these ghosted lines slowly moving up or down the screen? Is all of your A/V gear connected to the same surge protector? A common source of a ground loop problem is a poorly or ungrounded cable line, if you have a coaxial cable line connected to your setup.
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post #3 of 38 Old 12-17-2006, 06:07 PM
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I think that's pretty much normal for every TV, not just plasma.
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post #4 of 38 Old 12-17-2006, 06:11 PM
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Quote:
Originally Posted by wl1980 View Post

When an image of a black frame is displayed in the middle of the screen, I would see very faint ghosting image of the top and bottom frames extending to the edge of the screen horizontally. I notice this when I play games using s-video, especailly under save menu in RPG games with light background. My TV is Panasonic TH42PX60. Anyone else having the same problem?

In here, you will find your the only one...no one with the Panasonic will admit anything bad about it..

!I don't want a Sony
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post #5 of 38 Old 12-17-2006, 10:59 PM - Thread Starter
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Quote:
Originally Posted by afiggatt View Post

This could be a ground loop problem. Are these ghosted lines slowly moving up or down the screen? Is all of your A/V gear connected to the same surge protector? A common source of a ground loop problem is a poorly or ungrounded cable line, if you have a coaxial cable line connected to your setup.

It only moves when the black frames move. Like when the black box moves up, the white ghosting lines would also move up.

I have a receiver, PS2, and a lamp connected to the same surge protector.
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post #6 of 38 Old 12-17-2006, 11:06 PM - Thread Starter
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Quote:
Originally Posted by McCormick View Post

In here, you will find your the only one...no one with the Panasonic will admit anything bad about it..

I found another Panasonic plasma owner having the same problem at Digitalhome.ca

I need to make sure if every Panasonic plasma are like this or if it's just the two of us. If my TV is defective I really need to return it asap.
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post #7 of 38 Old 12-17-2006, 11:07 PM - Thread Starter
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Sorry about multiple posts because I need at least 5 posts before I can post the link.
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post #8 of 38 Old 12-17-2006, 11:07 PM - Thread Starter
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Here is the link of another owner with same problem:

http://www.digitalhome.ca/forum/showthread.php?t=54264
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post #9 of 38 Old 12-17-2006, 11:37 PM
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I'm telling ya it's normal. I'm watching my tube CRT & it does the same thing.
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post #10 of 38 Old 12-18-2006, 08:37 AM
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Quote:
Originally Posted by wtfer View Post

I'm telling ya it's normal. I'm watching my tube CRT & it does the same thing.

Wtfer is right. I have seen this on CRT as well. I think that this might be a different problem with a plasma though. Probably something to do with image processing.
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post #11 of 38 Old 12-18-2006, 08:54 AM
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Quote:
Originally Posted by wl1980 View Post

It only moves when the black frames move. Like when the black box moves up, the white ghosting lines would also move up.

I have a receiver, PS2, and a lamp connected to the same surge protector.


Does it change if you disconnect the receiver, PS2, and/or lamp?
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post #12 of 38 Old 12-18-2006, 09:13 AM
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Quote:
Originally Posted by wl1980 View Post

When an image of a black frame is displayed in the middle of the screen, I would see very faint ghosting image of the top and bottom frames extending to the edge of the screen horizontally. I notice this when I play games using s-video, especailly under save menu in RPG games with light background. My TV is Panasonic TH42PX60. Anyone else having the same problem?

Got the exact same problem on my TH-42PX600U. However, it is only visible when the STB's online guide is on the screen. During normal viewing of TV, I don't notice it at all. Hooked up via HDMI. Visible in 1080i, 720p, 480p and 480i...

I thought I was the only one with this problem..
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post #13 of 38 Old 12-18-2006, 12:28 PM
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I've got the same issue on my hitachi hds52a. It's a bit irritating, not so much when it happens with menus, but it also happens when there is some hard edged horizontal object in the picture, e.g. if someone is standing in front of some window blinds the "ghosting" will run across the the person's face. now a couple of people in this thread have said that this is normal. maybe it's common, but is it normal? can it be eliminated somehow? i have everything running through a power conditioner and i've tried disconnecting my cable coax altogether to make sure that wasn't the problem. any other suggestions?
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post #14 of 38 Old 12-18-2006, 01:24 PM
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You can also sometimes see this when credits are rolling over the video at the end of a show. I've noticed it specifically with Storytellers on MHD when they roll the credits at the end because of the font being such a bright white color. You can see horitontal shading (what I like to call it) that extends across the screen for each line of text and it follows the text as it moves up the screen.

BTW, I have a Panasonic TH-42PX60U plasma. I don't remember seeing this on my Samsung 32" LCD HDTV. But, I know I have seen something similar on CRTs in the past as well.

It's kind of annoying, but I only see it occasionally so it's not a problem for me. I would assume that the affect can be more pronounced are hardly noticable depending on the picture settings you have dialed in.
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post #15 of 38 Old 01-05-2007, 08:12 AM
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Anybody else noticed that?
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post #16 of 38 Old 01-05-2007, 09:40 AM
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I have a Panasonic plasma and yes, I've noticed it. (Disregard McCormick...)

I've noticed it on both the 42PX60U I demoed and also on the 42PH9UK that I bought. Only happens when the sidebars for 4:3 are set to dark or off.

No idea what causes it. Just turn the sidebars on to medium.
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post #17 of 38 Old 01-05-2007, 11:57 AM
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I have it too (can see it on the begining of trailers a lot with the rating of the movie on the green screen). I see it watching south park a lot too (digital connections).

I'm fairly certain it has something to do with the drive circuits in the TV and displaying high contrast material. But I'm talking out of my butt on that one. I wouldn't say your TV is defective however since it's not something you see under normal critical viewing. Maybe I'll poke around online and see if I can something definitive...
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post #18 of 38 Old 01-05-2007, 12:34 PM
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I should note that I don't notice this when viewing 4:3 material on an HDTV channel. That make sense?

You know how HD channels broadcast black side bars with 4:3 commercials? I don't notice these "ghost bands" under those circumstances. Only when viewing a native 4:3 image and not relying on the stretch or zoom functions.
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post #19 of 38 Old 08-05-2007, 01:13 AM
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I have the same issue with my new Panasonic 50" plasma (70A).

Is there a solution to this?

Maybe I should have gone LCD.
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post #20 of 38 Old 08-05-2007, 05:04 PM
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The following pic shows the issue (XBOX360):

http://img187.imageshack.us/my.php?image=img0953dp2.jpg
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post #21 of 38 Old 08-06-2007, 07:36 AM
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Yeah.. thats it..
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post #22 of 38 Old 08-06-2007, 03:15 PM
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Anyone got a possible solution?
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post #23 of 38 Old 08-06-2007, 03:55 PM
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Quote:
Originally Posted by orogogus View Post

I'm fairly certain it has something to do with the drive circuits in the TV and displaying high contrast material. But I'm talking out of my butt on that one.

I have been meaning to create at thread about this subject, and that is my guess too. I first noticed it reading forums on my ED 7uy and figured it was becuase I was using an ananlog connenction. But eventually I got a DVI blade and the problem was still there so I figured it was just a defect on my display. Now I've recently upgraded to a 50" 9uk and the problem is still there over both analog and digital.

So apparently the issue it is something inherent to the display's themselves. I'm curious to know if this happens with all plasmas, or if it is just particular to certain makes.
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post #24 of 38 Old 08-06-2007, 05:20 PM
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Interesting - have any other plasma owners noticed this defect?
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post #25 of 38 Old 08-06-2007, 05:26 PM
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Ive seen it very lightly on my Samsung 4254. It's really noticeable on the PC input if you move a window around on the screen. The titlebar of the window causes a faint horizontal line across the whole screen. Also on the HDMI input if I push the info or quick menu on my cable box I see it on HD programs since the cable box outputs this in the center.
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post #26 of 38 Old 08-06-2007, 05:46 PM
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So it seems to be a defect in all plasma panels.

Anyone know what causes it? And even better, how to solve it?
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post #27 of 38 Old 08-06-2007, 06:47 PM
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Defect is a harsh word to use.

Artifact of the way the signal is being processed is likely more accurate. It's suspicious to me that it only shows up in the high frequency domain (sharp, high contrast images) and then is addressed across an entire line(s) in the display.

I highly doubt there is anything you can do to correct it. Although it wouldn't surprise me if monkeying with the sharpness and/or contrast might modulate the way it manifests itself on any given display.
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post #28 of 38 Old 08-06-2007, 06:59 PM
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If anyone finds any settings that reduces the effect of the issue, let us know!
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post #29 of 38 Old 08-06-2007, 07:07 PM
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this was brought up on the UK forum recently: http://www.avforums.com/forums/showt...es#post5203892

you'll have to scroll up for the start of the discussion
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post #30 of 38 Old 08-06-2007, 09:19 PM
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I just photoshopped a quick menu image I found online with a scene from CSI Miami. Using Photoshop I recreated what I see on my panel. Notice the faint lines coinciding with the generated graphic. Once the graphic goes away so do the lines. I see this using a DVI to HDMI cable. It's also noticeable on the VGA input but I always contributed that to being an analog input.



Who else sees this? The effect of this varies on the graphic being overlaid and the scene around it. It's normally very subtle and I have to really look for it, but I can always spot it if I try. Yes, high frequency bursts seem to cause it. I've not only seen this on Plasma's, but CRT's as well.
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