Plasma TV Foggy area

  • Thread starter Michael Kennedy
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Michael Kennedy

Guest
I don't have this tv in hand now and also don't have the make and model of
this display at the moment but all I am looking for is general information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like it
is dirty from a oily hand but it doesn't wipe off. It is not a rectangular
area.

I am not familar with the common failure modes of Plasma displays. What is
your best guess would cause this.

Thanks in advance,

Mike
 
In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
mike@nospam.com says...
I don't have this tv in hand now and also don't have the make and model of
this display at the moment but all I am looking for is general information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like it
is dirty from a oily hand but it doesn't wipe off. It is not a rectangular
area.

I am not familar with the common failure modes of Plasma displays. What is
your best guess would cause this.
Click to expand...
Someone used solvent to clean the screen?

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays. What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.
Click to expand...
Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for the
stupid questions, but I have never taken apart, owned or even used a plasma
display. I am only familiar with the VERY basic principles of operation and
know it uses phosphors which are similar to a CRT but uses some other method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong about
that.
 
"Randy Day" <randy.day@sasktel.netx> wrote in message
news:MPG.26eaccdb1b1fd1e19896c0@202.177.16.121...
In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
mike@nospam.com says...
I don't have this tv in hand now and also don't have the make and model
of
this display at the moment but all I am looking for is general
information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it
is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular
area.

I am not familar with the common failure modes of Plasma displays. What
is
your best guess would cause this.

Someone used solvent to clean the screen?
Click to expand...
Interesting idea.. That's a case where the screen could be fixed... I will
have a close look at it in a couple of days.
The price is right on this thing, but I don't want to sink money into it if
the screen is about to crap out.. Since that's the one piece that cant be
repaired.
 
On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy <mike@nospam.com> wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays. What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for the
stupid questions, but I have never taken apart, owned or even used a plasma
display. I am only familiar with the VERY basic principles of operation and
know it uses phosphors which are similar to a CRT but uses some other method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong about
that.
Click to expand...
There is no convergance nor is there any concept of focussing. The
pixels are fixed in size and location and nothing can affect that.
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.15.27.11@hahahahahahahah.nutz.I.am...
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model of this display at the moment but all I am looking for is
general information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays.
What is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma display. I am only familiar with the VERY basic principles of
operation and know it uses phosphors which are similar to a CRT but uses
some other method to illuminate the phosphors. I guess uses some kind of
micro printed circuitry similar to an LCD display, but I could be
totally wrong about that.

The phosphors are illuminated by bursts of plasma emitting a UV light not
an electron beam. Cells are filled with gases including a small amount of
mercury. Each cell is capable of the three primary colors and depending
on the amount of electricity applied to the cell controls the intensity.
That's about it for my understanding.
Click to expand...
Hmm.. Interesting. Plasma bursts.Hence why it's called a Plasma display..
Thanks for the basic run down.
 
"AZ Nomad" <aznomad.3@PremoveOBthisOX.COM> wrote in message
news:slrni825ad.gkr.aznomad.3@ip70-176-155-130.ph.ph.cox.net...
On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy <mike@nospam.com
wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays. What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for the
stupid questions, but I have never taken apart, owned or even used a
plasma
display. I am only familiar with the VERY basic principles of operation
and
know it uses phosphors which are similar to a CRT but uses some other
method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong about
that.

There is no convergance nor is there any concept of focussing. The
pixels are fixed in size and location and nothing can affect that.
Click to expand...
That's the question I was wondering.. Thanks!
I've got a little better idea of how this thing works now. Before it was
all speculation.
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.15.27.11@hahahahahahahah.nutz.I.am...
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model of this display at the moment but all I am looking for is
general information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays.
What is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma display. I am only familiar with the VERY basic principles of
operation and know it uses phosphors which are similar to a CRT but uses
some other method to illuminate the phosphors. I guess uses some kind of
micro printed circuitry similar to an LCD display, but I could be
totally wrong about that.

The phosphors are illuminated by bursts of plasma emitting a UV light not
an electron beam. Cells are filled with gases including a small amount of
mercury. Each cell is capable of the three primary colors and depending
on the amount of electricity applied to the cell controls the intensity.
That's about it for my understanding.




My first thoughts were it working similar to a VFD in some kind of
Click to expand...
complicated arangement...
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.15.58.23@hahahahahahahah.nutz.I.am...
On Sat, 04 Sep 2010 00:47:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.15.27.11@hahahahahahahah.nutz.I.am...
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model of this display at the moment but all I am looking for is
general information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like it is dirty from a oily hand but it doesn't wipe off. It is not
a rectangular area.

I am not familar with the common failure modes of Plasma displays.
What is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma display. I am only familiar with the VERY basic principles of
operation and know it uses phosphors which are similar to a CRT but
uses some other method to illuminate the phosphors. I guess uses some
kind of micro printed circuitry similar to an LCD display, but I could
be totally wrong about that.

The phosphors are illuminated by bursts of plasma emitting a UV light
not an electron beam. Cells are filled with gases including a small
amount of mercury. Each cell is capable of the three primary colors and
depending on the amount of electricity applied to the cell controls the
intensity. That's about it for my understanding.




My first thoughts were it working similar to a VFD in some kind of
complicated arangement...

What fascinates me still is the workings of a DLP.
Click to expand...
Agreed.. Quite amazing what can be done with a silicon chip.
 
Someone used solvent to clean the screen?
Click to expand...
A good suggestion.

It's hard to imagine a plasma screen being "out of focus", as there is
nothing /to/ focus -- that I'm aware of.
 
Randy Day wrote:
In article<VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
mike@nospam.com says...
I don't have this tv in hand now and also don't have the make and model of
this display at the moment but all I am looking for is general information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like it
is dirty from a oily hand but it doesn't wipe off. It is not a rectangular
area.

I am not familar with the common failure modes of Plasma displays. What is
your best guess would cause this.

Someone used solvent to clean the screen?

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Click to expand...
Aren't the front of the screens made of glass??? If so, how would a
solvent affect the screen?
 
"Ken" <Ken@invalid.com> wrote in message
news:i5r82t$qsj$1@news.eternal-september.org...
Randy Day wrote:
In article<VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
mike@nospam.com says...
I don't have this tv in hand now and also don't have the make and model
of
this display at the moment but all I am looking for is general
information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it
is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular
area.

I am not familar with the common failure modes of Plasma displays. What
is
your best guess would cause this.

Someone used solvent to clean the screen?

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

Aren't the front of the screens made of glass??? If so, how would a
solvent affect the screen?
Click to expand...
Yes but its coated with an anti-glare surface. Just like any quality CRT
monitor had. That as well could be destroyed if you used a solvent based
cleaner on it.
 
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays. What
is your best guess would cause this.

Thanks in advance,

Mike
Click to expand...
Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.



--
Live Fast, Die Young and Leave a Pretty Corpse
 
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model of this display at the moment but all I am looking for is
general information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays.
What is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma display. I am only familiar with the VERY basic principles of
operation and know it uses phosphors which are similar to a CRT but uses
some other method to illuminate the phosphors. I guess uses some kind of
micro printed circuitry similar to an LCD display, but I could be
totally wrong about that.
Click to expand...
The phosphors are illuminated by bursts of plasma emitting a UV light not
an electron beam. Cells are filled with gases including a small amount of
mercury. Each cell is capable of the three primary colors and depending
on the amount of electricity applied to the cell controls the intensity.
That's about it for my understanding.




--
Live Fast, Die Young and Leave a Pretty Corpse
 
On Fri, 3 Sep 2010 23:45:09 +0900, "Michael Kennedy" <mike@nospam.com>
wrote:

I don't have this tv in hand now and also don't have the make and model of
this display at the moment but all I am looking for is general information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like it
is dirty from a oily hand but it doesn't wipe off. It is not a rectangular
area.

I am not familar with the common failure modes of Plasma displays. What is
your best guess would cause this.

Thanks in advance,

Mike

As has already been suggested, it must be someting on the surface of
Click to expand...
the panel itself. Use of a cleaner is one possibility. Another is
some sort of grease or other material.

Some replacement panels have a protective film. If that was not
removed at the factory, or it left a residue, that would be a possible
result. IMHO, that's an extreme long shot.

One good source of information on Plasma displays is to Google 'Plasma
training manual Scribd' This will bring up a number of training
manuals. The LG ones in particular have much information on the
actual construction of the panel. The down side is it is the
translation was horrible.

PlainBill
 
On Sat, 04 Sep 2010 00:47:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.15.27.11@hahahahahahahah.nutz.I.am...
On Sat, 04 Sep 2010 00:18:51 +0900, Michael Kennedy wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model of this display at the moment but all I am looking for is
general information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like it is dirty from a oily hand but it doesn't wipe off. It is not
a rectangular area.

I am not familar with the common failure modes of Plasma displays.
What is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma display. I am only familiar with the VERY basic principles of
operation and know it uses phosphors which are similar to a CRT but
uses some other method to illuminate the phosphors. I guess uses some
kind of micro printed circuitry similar to an LCD display, but I could
be totally wrong about that.

The phosphors are illuminated by bursts of plasma emitting a UV light
not an electron beam. Cells are filled with gases including a small
amount of mercury. Each cell is capable of the three primary colors and
depending on the amount of electricity applied to the cell controls the
intensity. That's about it for my understanding.




My first thoughts were it working similar to a VFD in some kind of
complicated arangement...
Click to expand...
What fascinates me still is the workings of a DLP.



--
Live Fast, Die Young and Leave a Pretty Corpse
 
Michael Kennedy wrote:
"AZ Nomad" <aznomad.3@PremoveOBthisOX.COM> wrote in message
news:slrni825ad.gkr.aznomad.3@ip70-176-155-130.ph.ph.cox.net...

On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy <mike@nospam.com
wrote:


"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...

On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:


I don't have this tv in hand now and also don't have the make and model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays. What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for the
stupid questions, but I have never taken apart, owned or even used a
plasma
display. I am only familiar with the VERY basic principles of operation
and
know it uses phosphors which are similar to a CRT but uses some other
method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong about
that.

There is no convergance nor is there any concept of focussing. The
pixels are fixed in size and location and nothing can affect that.


That's the question I was wondering.. Thanks!
I've got a little better idea of how this thing works now. Before it was
all speculation.


Sounds like you've had one or more pixels short/burn out and caused some
Click to expand...
soot to cover the inside of the screen a bit?

Jamie
 
"Michael Kennedy" <mike@nospam.com> wrote in message
news:7vqdnYbfH6htixzRnZ2dnVY3goWdnZ2d@giganews.com...
"AZ Nomad" <aznomad.3@PremoveOBthisOX.COM> wrote in message
news:slrni825ad.gkr.aznomad.3@ip70-176-155-130.ph.ph.cox.net...
On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy <mike@nospam.com
wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays.
What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for the
stupid questions, but I have never taken apart, owned or even used a
plasma
display. I am only familiar with the VERY basic principles of operation
and
know it uses phosphors which are similar to a CRT but uses some other
method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong about
that.

There is no convergance nor is there any concept of focussing. The
pixels are fixed in size and location and nothing can affect that.

That's the question I was wondering.. Thanks!
I've got a little better idea of how this thing works now. Before it was
all speculation.
Click to expand...
It was not unknown for plasma cells on older panels to develop a 'memory' of
some bright content that had been displayed, resulting in a sort of visible
'stain'. In the worst case, this could cause permanent damage to the cells
in the area, but often, the effect could be negated with a special service
mode that did an intense white wipe of the panel. I'm pretty sure that
modern panels don't suffer from this problem, and are much less susceptible
to cell burn from high intensity static displays, but if the set is more
than a few years old, it might be worth checking to see if there is a
service mode that carries out a panel wipe. It may even be available as a
user function through one of the menus.

Have a read of

http://en.wikipedia.org/wiki/Plasma_display

For a good description of the principles involved

Arfa
 
"Michael Kennedy" <mike@nospam.com> wrote in message
news:TeydnWj5w-JXjxzRnZ2dnVY3goydnZ2d@giganews.com...
"Randy Day" <randy.day@sasktel.netx> wrote in message
news:MPG.26eaccdb1b1fd1e19896c0@202.177.16.121...
In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
mike@nospam.com says...
I don't have this tv in hand now and also don't have the make and model
of
this display at the moment but all I am looking for is general
information
for now.

This tv has a smudged / blurry area on the screen. It looks almost like
it
is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular
area.

I am not familar with the common failure modes of Plasma displays. What
is
your best guess would cause this.

Someone used solvent to clean the screen?


Interesting idea.. That's a case where the screen could be fixed... I will
have a close look at it in a couple of days.
The price is right on this thing, but I don't want to sink money into it
if the screen is about to crap out.. Since that's the one piece that cant
be repaired.
Click to expand...
Lets not get ahead of ourselves - do we know for sure it's really a plasma
and not an LCD? My customers often confuse the two.

If not damage to anti-glare coating which has been suggested, it does sound
more like an LCD type problem to me.

Mark Z.
 
On Sat, 04 Sep 2010 01:58:16 +0100, Arfa Daily wrote:

"Michael Kennedy" <mike@nospam.com> wrote in message
news:7vqdnYbfH6htixzRnZ2dnVY3goWdnZ2d@giganews.com...

"AZ Nomad" <aznomad.3@PremoveOBthisOX.COM> wrote in message
news:slrni825ad.gkr.aznomad.3@ip70-176-155-130.ph.ph.cox.net...
On Sat, 4 Sep 2010 00:18:51 +0900, Michael Kennedy <mike@nospam.com
wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2010.09.03.14.59.46@hahahahahahahah.nutz.I.am...
On Fri, 03 Sep 2010 23:45:09 +0900, Michael Kennedy wrote:

I don't have this tv in hand now and also don't have the make and
model
of this display at the moment but all I am looking for is general
information for now.

This tv has a smudged / blurry area on the screen. It looks almost
like
it is dirty from a oily hand but it doesn't wipe off. It is not a
rectangular area.

I am not familar with the common failure modes of Plasma displays.
What
is your best guess would cause this.

Thanks in advance,

Mike

Since it only covers a non-symmetrical portion of the screen my
guestimate would be the screen itself.


Thanks for the insight Meat.

These aren't affected by magnets the way CRT sets are they? Sorry for
the stupid questions, but I have never taken apart, owned or even used
a plasma
display. I am only familiar with the VERY basic principles of
operation and
know it uses phosphors which are similar to a CRT but uses some other
method
to illuminate the phosphors. I guess uses some kind of micro printed
circuitry similar to an LCD display, but I could be totally wrong
about that.

There is no convergance nor is there any concept of focussing. The
pixels are fixed in size and location and nothing can affect that.

That's the question I was wondering.. Thanks! I've got a little better
idea of how this thing works now. Before it was all speculation.


It was not unknown for plasma cells on older panels to develop a
'memory' of some bright content that had been displayed, resulting in a
sort of visible 'stain'. In the worst case, this could cause permanent
damage to the cells in the area, but often, the effect could be negated
with a special service mode that did an intense white wipe of the panel.
I'm pretty sure that modern panels don't suffer from this problem, and
are much less susceptible to cell burn from high intensity static
displays, but if the set is more than a few years old, it might be worth
checking to see if there is a service mode that carries out a panel
wipe. It may even be available as a user function through one of the
menus.

Have a read of

http://en.wikipedia.org/wiki/Plasma_display

For a good description of the principles involved

Arfa
Click to expand...
If the screen protector was damaged by some solvent it would be easy to
tell using a little oblique lighting



--
Live Fast, Die Young and Leave a Pretty Corpse
 
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