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'Concealed'
1999\03\18@204722 by Jagath Ekanayake

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Subject:  [OT] TV + speaker -Reply

Ryan,

You are not the only one!!  it happend to me too !

Use the same speaker to remove the shading by
moving it close to that area. You may need to move it
around  several times.

good luck

Jagath

1999\03\18@205137 by Ryan Pogge

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hmm sounds like its worth a try (i think....)
=]

ryan




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1999\03\18@205347 by Ryan Pogge

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ok i put it back on top and the shading diapears...
but then I take the speaker away and the shading reapears...
can i put the speaker underneath the TV for a little
while to fix it, since I did the original damage by
placeing it on top of the TV.???



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1999\03\18@210424 by Jagath Ekanayake

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Subject:  Re: Concealed -Reply

I am not sure Ryan !

It was all trial and error. It comes and goes but
eventually I managed to remove it completely. Try two
speakers (magnets) in both directions.


Perhaps someone can give a logical explanation to
this.

Jagath

1999\03\18@211050 by Ryan Pogge

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when you did it did you put the speaker in aproxamatly the same place as
where
it originaly was to when it screwed up the tv?  how long do I leave it? a
few minuts...
an hour?  Im afraid to damage it more... my parents will kill me if they see
what I
have done =[

thanks,
Ryan



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1999\03\18@211252 by Sean Breheny

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Hi Ryan and Jagath,

What has happened is that you slightly magnetized metal parts of the TV
with the speaker magnet. I have had some luck in fixing the problem by
CAREFULLY (I mean don't put it right next to the TV right away,experiment
with the distance) taking a small magnet which you can hold in your hand
and moving it in circles around the TV. Try moving it in clockwise and
counter-CW directions and varying the orientation of the circles and their
distance from the TV.

The RIGHT way to fix this is with a Degaussing Coil,which is just a big
coil which can be plugged into the AC (120V) supply and placed near parts
of the TV. I doubt you have one of these,though.

Try the magnet and see what happens,

Sean

At 08:47 PM 3/18/99 -0500, you wrote:
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| Sean Breheny
| Amateur Radio Callsign: KA3YXM
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1999\03\18@212504 by Zonn

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On Thu, 18 Mar 1999 21:04:19 -0500, Ryan Pogge <.....poggeKILLspamspam@spam@SHORE.INTERCOM.NET> wrote:

>when you did it did you put the speaker in aproxamatly the same place as
>where
>it originaly was to when it screwed up the tv?  how long do I leave it? a
>few minuts...
>an hour?  Im afraid to damage it more... my parents will kill me if they see
>what I
>have done =[

Hey Ryan,

There is a degausser built into every color TV.  Each time you turn on your TV,
it will perform a self degaussing cycle.

What you need to do is remove the speaker from the TV (along with all other
magnets) and turn the TV on for about 10 seconds.  Turn it back off.  Wait 5 to
10 minutes (for the degausser to cool down and reset itself), the turn it back
on for 10 seconds, turn it back off, wait another 5 to 10 minutes, etc.

Each time you turn on the TV it should make the screen a little bit better, and
eventually, assuming your TV's degaussing circuit is working, the problem should
fix itself.

Good luck!

-Zonn

1999\03\18@220511 by David W. Duley

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In a message dated 3/18/99 6:12:42 PM Pacific Standard Time, shb7spamKILLspamCORNELL.EDU
writes:

<<
The RIGHT way to fix this is with a Degaussing Coil,which is just a big
coil which can be plugged into the AC (120V) supply and placed near parts
of the TV. I doubt you have one of these,though.

Try the magnet and see what happens,

Sean >>

If you can't find a degaussing coil use an AC powered tape eraser.  They are
available from radio shack.  Move the coil or the eraser in random circular
paterns in front of the screen.  Start about 6 inches away from the face of
the tube and then slowley move back until you are 5 or 6 feet away.  Then turn
off the coil.  Repeat if necessary.  I have used this method hundreds of time
on TVs, monitors and video game monitors.  It works infinitely better than a
small magnet will.

Hope this helps
Dave Duley

1999\03\18@223032 by Mike Keitz

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On Thu, 18 Mar 1999 21:04:19 -0500 Ryan Pogge <.....poggeKILLspamspam.....SHORE.INTERCOM.NET>
writes:
>when you did it did you put the speaker in aproxamatly the same place
>as
>where
>it originaly was to when it screwed up the tv?  how long do I leave
>it? a
>few minuts...
>an hour?  Im afraid to damage it more... my parents will kill me if
>they see
>what I
>have done =[

Turn the TV off and move all speakers far away.  Wait about 15 minutes
and turn the TV back on.  If that diminished but didn't cure the problem,
turn the TV off for another 15 minutes and turn it back on.  What you are
doing is activating the internal "degaussing" system in the TV that
attempts to demagnetize the picture tube each time it is switched on.

The internal degaussing system is not very strong.  If several off-on
cycles can't undo what the speaker has magnetized, you'll need to use an
external magnetic field.  TV technicians do this all the time with a
"degaussing coil".  Lacking one of those, you can try with magnets as
others have suggested.  An AC field from a device like a tape eraser
would work better.  Turn the eraser on, bring it near the TV and
demagnetize everything, then move it several feet way before turning it
off.  There is little risk of damaging anything trying to do it yourself,
but if the TV is small enough to move easily, I'd recommend taking it to
a shop and having it degaussed.  It shouldn't cost much since the
procedure can be done in a matter of seconds at the front counter without
having to take anything apart.

>>Perhaps someone can give a logical explanation to
>>this.

Metal parts near the screen have become magnetized.  The magnetism causes
the electrons in the picture tube to go the wrong direction and hit the
wrong colored phosphor dots on the screen.  That makes the picture, or
parts of it, off-color.


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1999\03\19@022650 by Harold Hallikainen

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On Thu, 18 Mar 1999 21:10:36 -0500 Sean Breheny <EraseMEshb7spam_OUTspamTakeThisOuTCORNELL.EDU>
writes:
>The RIGHT way to fix this is with a Degaussing Coil,which is just a
>big
>coil which can be plugged into the AC (120V) supply and placed near
>parts
>of the TV. I doubt you have one of these,though.
>


       Year's ago TVs had automatic degaussing built in.  Don't they do that
any more?  If so, just turn the TV on and off a few times.  Every time it
comes on, it'll degauss the shadow mask, or whatever they're using now.

Harold

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1999\03\19@065023 by Harrison Cooper

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You need to degauss the tube.  The magnetic field from your speaker caused
this.  Most TV's have a small degauss built in, but you might have to either
borrow or take it to a shop to get it done.

1999\03\19@082030 by Ryan Pogge

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ok thanks everyone
I got it fixed by turning it off and on a bunch of times....
thanks for the help, I was realy starting to get scared :)
regards,
Ryan



>You need to degauss the tube.  The magnetic field from your speaker caused
>this.  Most TV's have a small degauss built in, but you might have to
either
>borrow or take it to a shop to get it done.
>

1999\03\19@084325 by Dave VanHorn

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>        Year's ago TVs had automatic degaussing built in.  Don't they
do that
>any more?  If so, just turn the TV on and off a few times.  Every
time it
>comes on, it'll degauss the shadow mask, or whatever they're using
now.
>
>Harold




Anything built in the last 20 years most likely has one. You have to
wait with it off for a few minutes though, or it will not degauss when
you turn it on. A thermal device controls current into the coil, and
you have to let it cool down.

1999\03\19@103004 by Wagner Lipnharski

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You already got several suggestions, the professional one would be using
the degaussing coil.

As recommended by some degaussing tools; start far away, two or three
foot from the screen, turn power on to the coil, do wide circles in
front to the screen, two or three circles, then advance few inches
toward the screen, repeat two or three circles, keep going until you get
10-12 inches from screen, do 4-6 circles then go back repeating the same
sequence until you reach two or three foot away, =THEN= turn off the
magnetic monster.

If you are unlucky to turn off the magnet close to the TV, the problem
will intensify and you need to repeat all over again, probably two or
three times.

You can't turn it off close to the screen, because the strong magnetic
field interrupted will "mark" the metallic elements at the screen,
increasing the problem.  This happens because the degaussing tool uses
alternate current (120Vac) to create also an alternate magnetic field
(60Hz), it reverses the magnetic fields north and south sixty times a
second, when close to the TV that field is very strong to turn all
images very green or any other color, but as they are reversing, one is
canceling another, and this is why you need to first approach the screen
slowly, and then also get back from the screen slowly, they will "wipe
out" any previous magnetic marked field, they are stronger.  If while
close to the TV power turns off, or if the power cable is not well
connected at the wall power outlet, creating a "turn off" condition, the
last magnetic field will be "marked" at the screen... be careful.

Wagner

1999\03\19@104216 by Wagner Lipnharski

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Ryan Pogge wrote:
>
> ok thanks everyone
> I got it fixed by turning it off and on a bunch of times....
> thanks for the help, I was realy starting to get scared :)
> regards,
> Ryan

You are lucky no to blow up the internal degaussing circuit.
It requires some time between sequence... this is why in the
repair shop they use an external degaussing tool instead the
internal one.  With the external, it can be done in less than
30 seconds, while the internal will take half an hour, and
they don't have that time handy... :)  Also, sometimes the
magnetic mark is so strong that it would take really dozens
of internal degaussing operation to start to remove it.
Wagner

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