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Ive searched here for this problem and did find some info. but here's my question in case there is anything I missed.
My son was playing with 2 magnets and got them too close to his monitor, I know they hit the glass but I dont know if he was holding them there. Now there is a darker patch about 3" diameter. You can see what's on the screen through the area but it is a darker shade.
Ive tried Degaussing (a lot), Turning monitor (and PC) off overnight and even tapping the glass with a heavy object to try and knock things back into place per:
http://www.computing.net/hardware/w...
If none of these things work, are my boys stuck with this problem on their monitor?
Is there any other advice?
Thank you very much.
Never bang or hit a CRT. They can and do explode (implode actually). They are full of toxic cr@p.
Don't know what you used to degausse it.I just use the same magnet and try to reverse the damage. Slowly use eihter pole and go towards the area. Move back and see for improvement. If not reverse pole and try again. It can be done.
Otherwise you'd need a degausser, rotate it close and slowly move away from the monitor.
I read it wrong and answer it wrong too. So get off my case you goober.
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Most monitors have an automatic degausser circuit that works each time you turn on the power. I have a 21" Hitachi that has a degauss button right on the control panel.
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If it is that badly magnetised or there is no inbuilt degauss this method will probably fix it. It is an amplification of the idea already given in #1:
Take the same magnet and continuously rotate it over the screen area (rather like you were washing it) from about 1 foot away. Keep this rotation going and gradually move closer to the screen until it nearly touches it. Ensure that you encompass the bad patch and don't suddenly stop the rotation.
Keep the above rotation going then slowly pull away until you are at least 3 feet from the screen - don't rush it. You will see some color changes during this process but just ignore them.
As you will have guessed, you are trying to disturb the magnetization that is existing. Of-course, a proper degauss coil would be more certain to fix it but you might get away with the above approach or at least make the patch less noticeable.
Oh yes, completely ignore the nonsense about using a hammer in that post you linked to. The guy doesn't have a clue what he's on about and you might bust the scren.
DerekW
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There's also the electric drill method:
http://www.woil.ws/fixmonitor/
I had a similar problem--kids, magnet and a TV--that I couldn't fix. Good luck.
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... pretty well the same idea as mine (any mechanised). Didn't like the look of that spike on the end of the drill tho - requires a little adjustment I reckon.
In days gone by watchmakers used a similar idea, (using a handle instead of a motor) to demagnetise watches. I've got nice pictures in my old watch repair books.
The "pulling away slowly" mimics how auto-degauss works in a TV or monitor. It's an AC field which fades away slowly. A sudden stop could still leave it polarised.
DerekW
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Yeah, I tried it with the drill but didn't attach any magnets. The EM field from the drill motor was supposed to supply the needed affect. I also tried a bulk tape eraser with similar results.
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If you have an old weller solder gun, they make excellent degaussers.
I wonder what'll happen if I do this ?
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DAVE
I expect that is because both devices are designed to contain the field, so what is outside is pretty weak. The spinning magnets is much better.sterlingk
I'm curious. Is that the type with a loop which is effectively a transformer secondary? I just happen to recall something of that sort here in the UK.TNFergus
Another addition to #1. Don't fall into the trap that an implosion is not so bad. The gun at the back of the tube shoots through the front of the screen. Not nice.DerekW
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The mask got pulled out of position. You may not be able to degauss it. A TV repair shop probably has a better degausser than anything I've read above and may not charge much for the service if you bring in the monitor. They charged me $60 to come to my house and do my 35 inch TV. If that doesn't work, I'd get a new monitor.
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As what started this was use of a magnet I would not therefore assume first off that the mask has got pulled out of position. If it has been hit hard then this is more likely to shift the mask (if it was not fixed too well in manufacturer).
Use of a proper degauss coil is best but there is nothing lost by first trying the more crude methods given. They cost nothing and might well do the trick.
DerekW
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Many modern electric (or battery) drills use permanent magnet fields and won't work for this purpose
What you need is something with a TRANSFORMER that will generate a rather large alternating field.
A Weller soldering gun, or other soldering GUN with the large bulky transformer will work. A bulk video/audio tape eraser will work. If you have something like an AC electric train transformer, you can try to wind a bunch of wire on a large form, but some train transformers are actually a DC power supply, and won't work.
You need to start with the AC field up close to the monitor, move it slowly around, and slooooooly away from the monitor, and then turn off the demagnetizing device.
I doubt very much that you've damaged the mask.
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