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Free 42" Plasma Screen if help remove/minimize screen burn !

We have 50 of these 42" Hitachi Plasma Displays with the same type of
screen burn.

If you have any ideas on how to successfully remove/minimize/fix this
problem, please let us know.

If we receive a successfull suggestion, we will give you one of these
42" plasma screens.

Thanks for your help,

[email protected]
 
Please post here email contact so you can send me one.
The fix is: Buy a new plasma screen.
Screen burn on these is permanent. The display panels are not
available as a part as they are 99% the cost of the whole unit and cost
more to ship as a part due to the special packing then it does to ship
it installed in the unit.

David
 
S

Shawn D'Alimonte

Jan 1, 1970
0
Screen burn on these is permanent.

Well, you could display exactly the opposite image until the whole
screen is equally burned :).
 
G

Gary J. Tait

Jan 1, 1970
0
We have 50 of these 42" Hitachi Plasma Displays with the same type of
screen burn.

If you have any ideas on how to successfully remove/minimize/fix this
problem, please let us know.

Burn the rest of the screen with an image inverse to the burn, so all
pels have equal burn.
 
F

Franc Zabkar

Jan 1, 1970
0
We have 50 of these 42" Hitachi Plasma Displays with the same type of
screen burn.

If you have any ideas on how to successfully remove/minimize/fix this
problem, please let us know.

If we receive a successfull suggestion, we will give you one of these
42" plasma screens.

Thanks for your help,

[email protected]

Is the burn confined to the periphery or to a corner, eg a station
logo? If so, would it be possible to modify the electronics so that
the viewable area would be limited to the good portion?


- Franc Zabkar
 
N

NSM

Jan 1, 1970
0
Shawn D'Alimonte said:
Well, you could display exactly the opposite image until the whole
screen is equally burned :).

That's probably the ONLY possible 'fix'.
 
J

Jack Zeal

Jan 1, 1970
0
Gary said:
Burn the rest of the screen with an image inverse to the burn, so all
pels have equal burn.
Sell 'em as-is at a relatively low price (USD 1000 or even 800)-- it's
better than throwing them out, and I've seen new 42" plasmas for below 2000.

Perhaps a little tweak to the image control will make the burn less
prominent. I'd think dialing down the brightness might help
 
J

James Sweet

Jan 1, 1970
0
NSM said:
That's probably the ONLY possible 'fix'.


It is, and in the end the screens will be quite well used looking, the
unfortunate problem with plasma screens is they will burn in easily and once
it happens they're essentially junk.
 
K

Ken Weitzel

Jan 1, 1970
0
James said:
It is, and in the end the screens will be quite well used looking, the
unfortunate problem with plasma screens is they will burn in easily and once
it happens they're essentially junk.

Hi...

I can think of one way of possibly salvaging some
value from them...

The OP said they were all 42 inches. He also said they
were burned in only one corner.

So - if that corner isn't *too* big; then how about
shrinking the scan so that it essentially becomes a
36 or so inch set, with a dark mask around the edge?

He also said he had *lots* of them. So perhaps the first
mod might take up a bit of time to do, but then all the
rest should be not too bad.

Do I win? Send me mine :) :)

Take care.

Ken
 
A

Alan Harriman

Jan 1, 1970
0
Well, you could display exactly the opposite image until the whole
screen is equally burned :).

Correct!! You just earned a used 42" Plasma display. I"m sure you'll
be contacted soon to arrange shipment.

Alan Harriman
 
J

jakdedert

Jan 1, 1970
0
Ken said:
Hi...

I can think of one way of possibly salvaging some
value from them...

The OP said they were all 42 inches. He also said they
were burned in only one corner.

So - if that corner isn't *too* big; then how about
shrinking the scan so that it essentially becomes a
36 or so inch set, with a dark mask around the edge?

He also said he had *lots* of them. So perhaps the first
mod might take up a bit of time to do, but then all the
rest should be not too bad.

Do I win? Send me mine :) :)
Read the OP again. Nowhere in there did he say that it was a corner
burn...I think that was a suggestion further down the thread.

jak
 
J

James Sweet

Jan 1, 1970
0
Ken Weitzel said:
Hi...

I can think of one way of possibly salvaging some
value from them...

The OP said they were all 42 inches. He also said they
were burned in only one corner.

So - if that corner isn't *too* big; then how about
shrinking the scan so that it essentially becomes a
36 or so inch set, with a dark mask around the edge?

How do you propose shrinking the scan on a digitally addressed flat panel
display?

Aside from that, he never said it was just in the corner.
 
N

NSM

Jan 1, 1970
0
We have 50 of these 42" Hitachi Plasma Displays with the same type of
screen burn.

Where is the burn? How did it happen? What is the pattern?
 
S

Sam Goldwasser

Jan 1, 1970
0
James Sweet said:
It is, and in the end the screens will be quite well used looking, the
unfortunate problem with plasma screens is they will burn in easily and once
it happens they're essentially junk.

If someone could solve this problem, they would be foolish to post the
solution here before patenting it. Think of the $millions that could be
made refurbing plasma screen TVs!

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.
 
B

Bob Urz

Jan 1, 1970
0
Sam said:
If someone could solve this problem, they would be foolish to post the
solution here before patenting it. Think of the $millions that could be
made refurbing plasma screen TVs!

Sure, i got the solution. You buy some of those fake bullet holes that
they sell to stick on cars and put it on the plasma screen over the burn
marks!

There is a solution, but its not cheap. The people with the ideas for
anti burn on the undamaged part of the screen are off base. Why? the
logo or image that is burned was a consistent image. The rest of the
screen probably had moving video that was constantly changing. So how do
you realistically do that?

The solution is like a audio Mix minus. (or in this case a mix plus).
The signal goes into a video processor. The bad pixel areas are mapped
out by address, color and loss of color. The incoming signal sent to
these areas are then boosted to make up for the loss of the phosphor
intensity. Essentially, a look up table which will add signal intensity
to any signal goes into these areas. And compensates by how degraded
each pixel is.

That out to be worth two free monitors! ;)

From the looks of the OP's Email, he is probably a surplus seller
looking to make a fast buck off of these. If these were in a airport or
such with large stationary graphics, there probably a lost cause. This
is NOT a good application for a plasma monitor

Bob
 
B

Bob Urz

Jan 1, 1970
0
Jack said:
Sell 'em as-is at a relatively low price (USD 1000 or even 800)-- it's
better than throwing them out, and I've seen new 42" plasmas for below
2000.
Do you think people will pay a $1000 Dollars for a Damaged screen with
TV's as cheap as they are? A hundred or two maybe. You can by a
reasonable big screen for new for $1200 to $1500.

Bob
 
P

PawlRevere2

Jan 1, 1970
0
on some plasma models there is a button to flash the screen which reduces the
burn effect, but has the downside of reducing the life of the display by very
slightly dimming it for each use.

please send plasma tv.
 
S

Sam Goldwasser

Jan 1, 1970
0
Bob Urz said:
Sure, i got the solution. You buy some of those fake bullet holes that
they sell to stick on cars and put it on the plasma screen over the
burn marks!

There is a solution, but its not cheap. The people with the ideas for
anti burn on the undamaged part of the screen are off base. Why? the
logo or image that is burned was a consistent image. The rest of the
screen probably had moving video that was constantly changing. So how
do you realistically do that?

The solution is like a audio Mix minus. (or in this case a mix plus).
The signal goes into a video processor. The bad pixel areas are mapped
out by address, color and loss of color. The incoming signal sent to
these areas are then boosted to make up for the loss of the phosphor
intensity. Essentially, a look up table which will add signal intensity
to any signal goes into these areas. And compensates by how degraded
each pixel is.

That is the perfect solution. You'd have to provide a fast memory with a gain
constant for RGB at each pixel. But, that's no big deal anymore. If there's
an accessible place to put it in the digital, that would be best. Else, you're
going to have to convert to digital to do the lookup. The mapping could be
determined automatically with a PC-controlled video pattern generator and
photometer.

So, probably about $100,000 of engineering time and equipment and you'll be
all set. How much were you going to charge? :)

The AutoCal option would allow the user to test and adjust periodically.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.
 
J

James Sweet

Jan 1, 1970
0
Bob Urz said:
Do you think people will pay a $1000 Dollars for a Damaged screen with
TV's as cheap as they are? A hundred or two maybe. You can by a
reasonable big screen for new for $1200 to $1500.

Anywhere from $100-$500 is probably about right, depends on the amount of
burn, but even a moderately burned screen may still be fine for playing
video games.
 
B

Bob Urz

Jan 1, 1970
0
Sam said:
That is the perfect solution. You'd have to provide a fast memory with a gain
constant for RGB at each pixel. But, that's no big deal anymore. If there's
an accessible place to put it in the digital, that would be best. Else, you're
going to have to convert to digital to do the lookup. The mapping could be
determined automatically with a PC-controlled video pattern generator and
photometer.

So, probably about $100,000 of engineering time and equipment and you'll be
all set. How much were you going to charge? :)

Its a government project, so it will cost a million and sell for $10.
Of course, a game boy now has more computing power than my first S100
CPM computer.


The ideal way is a self map calibrator. the screen will first go through
a sequence of full color red, green, blue, and gray scale on separate
screens. A hi rez color video camera is set to pick up the screen image
with frame capture. The video camera output is then processed to define
the image areas that are not consistent, then the custom processor
creates the pixel map to compensate. Since most burn areas are larger
than pixel size, the camera does not need to resolve down to the pixel
to create the map.


Even the map might not make it 100%, but it will make it much more
viewable. Part of the potential problem is when the phosphor degrades,
it may not be just a linear loss of brightness. It may also have a color
shift in it emitted color temperature. They say this happens in High
output LCD projectors over long use. Purportedly, after 2000 hours of
use or so there can be some degradation's or "Wash out" of color due to
the color filters degrading.

Bob
 
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