magnet on tv screen

[david wilson]

i might be on a loser here but does anybody know if you can fix a t
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corne
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a pla
dumb about the problem.
any help would be great
thank

 

[Sam Goldwasser]

i might be on a loser here but does anybody know if you can fix a tv
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corner
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a play
dumb about the problem.
any help would be great

Unless it was a really powerful manget, should clear up in a few
days or after a few power cycles (on 5 minutes, off 15 minutes, repeat).
The degauser will do its job.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

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

 

[Homer J Simpson]

i might be on a loser here but does anybody know if you can fix a tv
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corner
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a play
dumb about the problem.

Leave it be. It will fix itself.

 

[Claude]

i might be on a loser here but does anybody know if you can fix a tv
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corner
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a play
dumb about the problem.
any help would be great
thanks

You can build a degausser. Wrap an iron rod with wire. Then run an ac
current through it and wave it over the magnatized area on the screen.

--

Attention Please:
All those who have 2, turn one in.
All those who are without, draw 1.
Thank you very much.

Claude Hopper

 

[JANA]

If the mask in the CRT is not damaged, this will probably clear in a number
of days, from the degasser cycling every time the set is powered off and on
again.

The other way to clear this, is to have a hand held CRT degaussing coil, and
demagnetize the screen.

--

JANA
_____



i might be on a loser here but does anybody know if you can fix a tv
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corner
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a play
dumb about the problem.
any help would be great
thanks

 

[Sam Goldwasser]

You can build a degausser. Wrap an iron rod with wire. Then run an ac
current through it and wave it over the magnatized area on the screen.

There should be no need to do this. The internal degausser should clear
it up in a few days or sooner.

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

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

 

[Eeyore]

i might be on a loser here but does anybody know if you can fix a tv
screen after a magnet has been held against it(my 4 year old daughter)
it is a sony 28" crt widescreen tv. there is discolour in one corner
where the magnet has actually touched the screen.
if not the tv is a rental anyway so i will have to return it a play
dumb about the problem.
any help would be great

If it doesn't clear up on its own ( I have known this happen with computer
monitors ) the use of a hand-held degausser would fix it ( eg by a repair chap
).

Certainly nothing serious to worry about.

Graham

 

[Michael A. Terrell]

You can build a degausser. Wrap an iron rod with wire. Then run an ac
current through it and wave it over the magnatized area on the screen.

That's a good way to warp the shadow mask. You want the alternating
magnetic field spread out over a larger area. I made 14" diameter coils
with 250 turns of 17 AWG double enamel with a double cotton covered
wire. I made a coil winder and wound a bunch of them in 1970. I also
used a heavy duty push button switch and a 20 foot AC cord so it was
easier to find an outlet to use it on service calls. I still have the
first one I built.



--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Wilfred]

Try unplugging the TV overnight. After about 30mins most TVs will
automatically Degauss when reconnected. Standby is not enough. Might
need a few attempts.

Wilfred

 

[Richard Rasker]

Try unplugging the TV overnight. After about 30mins most TVs will
automatically Degauss when reconnected. Standby is not enough. Might
need a few attempts.

And if that doesn't shift the coloured spot, you can use the magnet again
to neutralize the magnetization. Simply pass the magnet over the
discolouration with a semi-circular/wiping motion at 1 centimeter from
the screen at the closest point, making sure the magnet always travels
over the spot in the same direction, and with the same orientation
(North/South).
If the discolouration gets worse instead of better, flip the magnet over,
so the opposite pole points to the screen. If all goes well, most of the
discolouration should be gone after about half a dozen passes. The
degaussing function (as described by Wilfred) should get rid of whatever
is left.


Richard Rasker

 

[AZ Nomad]

Try unplugging the TV overnight. After about 30mins most TVs will
automatically Degauss when reconnected. Standby is not enough. Might
need a few attempts.

You should refrain from giving advice you've never tried.
The degaussing coil of a TV isn't strong enough to undo the damage from
a hand magnet. Maybe if you unplug the set and plug it in again forty
or fifty times, it might start to erase the magnetized spot.

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field. Maybe
a AC powered shaver would have a strong enough field?

 

[AZ Nomad]

And if that doesn't shift the coloured spot, you can use the magnet again
to neutralize the magnetization. Simply pass the magnet over the
discolouration with a semi-circular/wiping motion at 1 centimeter from
the screen at the closest point, making sure the magnet always travels
over the spot in the same direction, and with the same orientation
(North/South).
If the discolouration gets worse instead of better, flip the magnet over,
so the opposite pole points to the screen. If all goes well, most of the
discolouration should be gone after about half a dozen passes. The
degaussing function (as described by Wilfred) should get rid of whatever
is left.

Also: step back slowly while waving the magnet around. I've successfully
removed magnetized spots with that technique.

 

[Ken Weitzel]

You should refrain from giving advice you've never tried.
The degaussing coil of a TV isn't strong enough to undo the damage from
a hand magnet. Maybe if you unplug the set and plug it in again forty
or fifty times, it might start to erase the magnetized spot.

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field. Maybe
a AC powered shaver would have a strong enough field?

Hi...

In the absence of a degausser or bulk eraser, a soldering gun
will do the job, albeit slowly.

Take care.

Ken

 

[Wilfred]

You should refrain from giving advice you've never tried.
The degaussing coil of a TV isn't strong enough to undo the damage from
a hand magnet. Maybe if you unplug the set and plug it in again forty
or fifty times, it might start to erase the magnetized spot.

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field. Maybe
a AC powered shaver would have a strong enough field?

Yes, Perhaps I should declare my only experience with this subject is
with a speaker I put too close to the TV. What I suggested did work for
me. A hand magnet on the screen might be an entirely different story.

Still , my suggestion wouldn't have done any harm either, and it "might"
have worked.

Wilfred

 

[Homer J Simpson]

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field.
Maybe
a AC powered shaver would have a strong enough field?

VHS tape eraser.

 

[Eeyore]

VHS tape eraser.

I have a tape head demagnetiser that's good for this.

Graham

 

[[email protected]]

You should refrain from giving advice you've never tried.
The degaussing coil of a TV isn't strong enough to undo the damage from
a hand magnet. Maybe if you unplug the set and plug it in again forty
or fifty times, it might start to erase the magnetized spot.

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field. Maybe
a AC powered shaver would have a strong enough field?

You appear to have forgotten your own advice. transformers dont produce
enough field, nor do shavers or motors, I've tried both on floppy
discs, with no effect. A shadowmask is a distance away from the front
of the screen, so will see even less field strength. Once you see a
bulk eraser you'll see why motors etc wont do it.


NT

 

[[email protected]]

You should refrain from giving advice you've never tried.
The degaussing coil of a TV isn't strong enough to undo the damage from
a hand magnet. Maybe if you unplug the set and plug it in again forty
or fifty times, it might start to erase the magnetized spot.

You need something with a stronger AC field. Back in the days of tape
cassettes, bulk tape erases worked well. A largish AC adapter (stuck into
an extension cord for portability) might generate enough of a field. Maybe
a AC powered shaver would have a strong enough field?

You appear to have forgotten your own advice. transformers dont produce
enough field, nor do shavers or motors, I've tried both on floppy
discs, with no effect. A shadowmask is a distance away from the front
of the screen, so will see even less field strength. Once you see a
bulk eraser you'll see why motors etc wont do it.

Tape head demagger also had no effect.


NT

 

[Caesar]

You appear to have forgotten your own advice. transformers dont produce
enough field, nor do shavers or motors, I've tried both on floppy
discs, with no effect. A shadowmask is a distance away from the front
of the screen, so will see even less field strength. Once you see a
bulk eraser you'll see why motors etc wont do it.

Tape head demagger also had no effect.

I strongly disagree with the above.

While a bulk tape demagnetizer is probably the best thing to use, I have
demagnetized many CRTs with an AC pencil sharpener and a pencil. These
are generally readily available. Cheap pencil sharpeners seem to work
best. I generally use a Boston one .

While several feet away, insert the pencil to start the sharpener.
Bring it close the the CRT and move it around, then back away from it
before removing the pencil. You will now have a demagnetized CRT and a
short pencil! Don't use a pen!!!!

If you want to see the effect, keep the TV on while doing it...it won't
hurt. You will see the magnetic field in action.

cv

 

[[email protected]]

[email protected] wrote:
I strongly disagree with the above.

While a bulk tape demagnetizer is probably the best thing to use, I have
demagnetized many CRTs with an AC pencil sharpener and a pencil. These
are generally readily available. Cheap pencil sharpeners seem to work
best. I generally use a Boston one .

While several feet away, insert the pencil to start the sharpener.
Bring it close the the CRT and move it around, then back away from it
before removing the pencil. You will now have a demagnetized CRT and a
short pencil! Don't use a pen!!!!

lol, maybe I'll try one of those if ever needed.


NT