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From: William Sommerwerck on 22 Apr 2010 15:27
> Some 'bulk erasers' spin a magnet using an electric motor.

Zenith once made one with a small magnet you spun by hand. It was intended
for small blotches.


From: AZ Nomad on 22 Apr 2010 15:34
On Thu, 22 Apr 2010 14:47:11 -0400, Ron Weston <RonW(a)nosuch.com> wrote:
>Thanks for the replies so far. My friend is a senior citizen and lives
>alone, so no children have been near the TV. There have been lightning
>storms so that may be what caused her TV problem.

>I have a bulk tape eraser. When I visit again first I'll try my
>degaussing coil on the side of the TV as well as the front, and if
>that doesn't work I'll try the eraser.

With the eraser, turn it on and off at least 5' away from the TV.
Walk slowly to the tv waving it around then back off. Be careful; the
things are very powerful and you might be able to damage the shadow
mask if you get closer than needed.
From: Arfa Daily on 22 Apr 2010 18:11

"William R. Walsh" <wm_walsh(a)hotmail.com> wrote in message
news:976ab687-72ed-487d-826d-ea5359e01050(a)z3g2000yqz.googlegroups.com...
> Hi!
>
>> Have your friend hide the magnets from the kids. The internal
>> degauss should take care of the remaining spots provided it
>> works.
>
> Sometimes it isn't stout enough to do the job. Some years back, my
> younger brothers managed to put a faint "blob" on a MAG Innovision 17"
> CRT. No amount of degaussing with the monitor's built in coil would do
> the job. Even though the coil came on at every power up, it just
> didn't seem to have the oomph. Operating it manually through the
> monitor's menu did not help.
>
> Being busy at the time, I took a quick look and decided that they'd
> damaged the monitor's picture tube. And then, after a while, I managed
> to acquire a large electric bulk eraser, which I eventually decided to
> try using as a degaussing wand for this monitor.
>
> It worked brilliantly. I started from several feet away by turning it
> on and moved very slowly toward the CRT itself. Then I ran it slowly
> around the CRT face, maintaining several inches worth of distance.
> When I was satisfied, I moved away the same several feet and shut the
> coil off.
>
> William

Back in't' day, we wuz taught to have the TV switched on, and go around the
four sides of the CRT using circular motions, and to keep those motions
going all the same way. Then to come up to the CRT face, and again use
circular motions, again keeping them in the same direction, and spiraling
slowly away from the face. At a distance of a couple of feet, when the field
from the coil was no longer having any noticeable effect on the picture, the
coil was quickly turned through 90 degrees, and powered off.

As to what caused the problem on this particular TV, could be all sorts of
things. One of the favourites, as I recall, was customers switching off the
vacuum cleaner when near to the TV. You can also get suddenly appearing
purity patches from shadowmask displacement when the spring expansion mounts
move out of place, or spot welds on the shadowmask frame give out. However,
mechanical issues such as these, would not reasonably be expected to cure by
manually degaussing, so I would say that the problem here is magnetic.

Arfa


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