Can I degauss my TV with a magnet?

[Nick Alexander]

I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?

Regards,
Nick Alexander

 

[Jerry G.]

NO. A permanent magnet will end up making the fault worse, and if strong
enough, it can do permanent damage. An AC or alternating field is required.
There are hand held degassing coils that are made for manually degassing
tubes. When a new CRT is installed, it is common practice to manually
degaussed it before doing the initial purity and convergence alignment.

The internal degaussing coil should do the job of demagnetizing the CRT mask
if it is working properly, the purity alignment is okay, and the mask is not
damaged.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
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"Nick Alexander" <nickalexander@xtra.co.nz> wrote in message
news:hlLdc.10640$d%6.186371@news.xtra.co.nz...
I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?

Regards,
Nick Alexander

 

[Sam Goldwasser]

"Nick Alexander" <nickalexander@xtra.co.nz> writes:

I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?

In principle this is possible and I have used it in a pinch but the
proper AC degaussing coil approach is much easier.

See the CRT FAQ: http://www.repairfaq.org/sam/crtfaq.htm .

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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Important: The email address in this message header may no longer work. To
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[Ken Weitzel]

Sam Goldwasser wrote:

"Nick Alexander" <nickalexander@xtra.co.nz> writes:


I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?


In principle this is possible and I have used it in a pinch but the
proper AC degaussing coil approach is much easier.

In the olden days (as my grand daughter refers to them
a Weller gun worked quite well if you you were without
a coil...

Ken

 

[John Todd]

On Sat, 10 Apr 2004 17:11:30 +1200, Nick Alexander
<nickalexander@xtra.co.nz> wrote:

I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?

Regards,
Nick Alexander

If I may presume to clarify Jerry and Sam's wisdom, you use
the internal degausser when you turn the power on, so turn your
set off and on a couple of times!



--
_______________________________________
John E. Todd <> jtodd@island.net

Note: Ensure correct polarity prior to connection.

 

[Sam Goldwasser]

ajb <newsG@sphynx.demon.co.uk> writes:

Yes, dangerous but possible. You use the old watchmaker's technique - a
strong horse-shoe magnet mounted on the end of a hand-drill to spin it
fast.

As Sam says, "in a pinch".... and indeed I have used this method. But I
wouldn't advise it any more.

And, as most of us neglected to mention the first time, just power cycling
the TV a few times (30 minutes off, 1 minute on) will likely clear it up
by activating the built-in degausser. Or, just wait a few days and this
will happen automagically.

--- sam | Sci.Electronics.Repair FAQ Home Page: 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 Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.

 

On Sat, 10 Apr 2004 17:11:30 +1200, "Nick Alexander"
<nickalexander@xtra.co.nz> wrote:

I have got some green patches on my TV since I moved my speakers too close
to the tube. Can I use a magnet to get rid of the colours?

Regards,
Nick Alexander

Are the speakers still too close? If they are, then the problem isn't
going to go away. You need shielded speakers if you want them that
close.

If this is a leftover from exposure to the speakers, then the normal
degaussing mechanism built-in to the TV may take care of this. Might
take several power cycles - wait several minutes between each cycle
for the coil/ptc to cool down otherwise you won't be getting much in
the way of field strength. Or just wait a few days of normal usage

-Chris