Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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JagMan
 
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Default Computer (CRT) Screen affected by Magnet

I have a computer (CRT) screen in my possession that has a lightly
effected area caused by a magnet. Degauss does not help. A co-worker
told me once that he used another magnet to fix the problem. I don't
want to do anymore damage to the screen. Any suggestions?

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Rick S.
 
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Default Computer (CRT) Screen affected by Magnet

"JagMan" wrote in message ups.com...
I have a computer (CRT) screen in my possession that has a lightly
effected area caused by a magnet. Degauss does not help. A co-worker
told me once that he used another magnet to fix the problem. I don't
want to do anymore damage to the screen. Any suggestions?


Call your local computer repair shop and ask them if you can
borrow their degaussing coil. Search Google for instructions
on how to use it.

Or just take the monitor in and let them fix it. It's a 30-second
procedure, and if they want to charge you more than $10 keep
looking for another repair shop.


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JANA
 
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Default Computer (CRT) Screen affected by Magnet

Did you try degaussing the screen with a hand held type degausser? There is
a chance that the shadow mask in the tube has been damaged.

I am assuming that nobody messed with the convergence and purity ring
magnets on the rear (neck) of the CRT.

--

JANA
_____


"JagMan" wrote in message
ups.com...
I have a computer (CRT) screen in my possession that has a lightly
effected area caused by a magnet. Degauss does not help. A co-worker
told me once that he used another magnet to fix the problem. I don't
want to do anymore damage to the screen. Any suggestions?


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JagMan
 
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Default Computer (CRT) Screen affected by Magnet

I believe that it happened during the transport of the monitor from my
stepfather's house to my apartment. He just got a new Ford F-150 that
has a built in subwoofer under the rear driver's side seat. During
transport, he placed the monitor screen down on the seat. After about a
45min trip, I think the subwoofer may have lightly induced the screen.
It is only visible on an all white screen such as a MS Word document.

The degauss method I used was the degauss button on the monitor itself.

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Default Computer (CRT) Screen affected by Magnet


JagMan wrote:
I believe that it happened during the transport of the monitor from my
stepfather's house to my apartment. He just got a new Ford F-150 that
has a built in subwoofer under the rear driver's side seat. During
transport, he placed the monitor screen down on the seat. After about a
45min trip, I think the subwoofer may have lightly induced the screen.
It is only visible on an all white screen such as a MS Word document.

The degauss method I used was the degauss button on the monitor itself.


A manual degauss may work then. The caveat here is that a monitor or
tv screen generally should never be shipped in a face down position.
If a bump had been hit very hard in the truck it still could have
(unlikely but possible) jarred the shadow mask or more likely the
aperature grille hard enough to slightly warp it, espcially while it
was being pulled by a strong magnetic field.

A manual deguass sometimes can be performed with a magnetic tape eraser
that plugs in to the ac line. More likely it will need to be performed
with the manual big round hand wand. If it is a trinitron crt with
aperature grille, whoever does the degauss needs to be aware that too
strong of a degausser can damage the tube. In other words they need to
start far away with a solid red image on screen and come closer to the
tube just past the point where the color purity problem is resolved,
then back away to finish the deguass. Never, ever start a degauss on a
trinitron tube with the degausser right next to the crt.



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James Sweet
 
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Default Computer (CRT) Screen affected by Magnet

JagMan wrote:
I believe that it happened during the transport of the monitor from my
stepfather's house to my apartment. He just got a new Ford F-150 that
has a built in subwoofer under the rear driver's side seat. During
transport, he placed the monitor screen down on the seat. After about a
45min trip, I think the subwoofer may have lightly induced the screen.
It is only visible on an all white screen such as a MS Word document.

The degauss method I used was the degauss button on the monitor itself.



An external degauss coil should fix you up, or maybe repeated attempts
with the internal one, but let it cool for a couple minutes between
tries. The built in ones aren't very powerful.
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Jamie
 
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Default Computer (CRT) Screen affected by Magnet

JagMan wrote:

I believe that it happened during the transport of the monitor from my
stepfather's house to my apartment. He just got a new Ford F-150 that
has a built in subwoofer under the rear driver's side seat. During
transport, he placed the monitor screen down on the seat. After about a
45min trip, I think the subwoofer may have lightly induced the screen.
It is only visible on an all white screen such as a MS Word document.

The degauss method I used was the degauss button on the monitor itself.

run an AC mag over the screen in circular motions and with draw
it from the center.
its most likely that the magnet on the large speaker was near it.


--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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