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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Can I degauss my TV with a magnet?
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 |
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Can I degauss my TV with a magnet?
If you mean a permanent magnet, no, that's what caused the problem in the
first place. Most TV's have a built-in degaussing circuit that works automatically when the set is switched on. Otherwise, you need to use a degaussing coil, powered by AC. I have also used an AC powered demagnetizer (for erasing recording tape) made by R. B. Annis. You start by applying power to the coil. Move it close to the screen and around in a circular motion to cover the entire area, then gradually move it a couple of feet away and turn the power off. -Ron (email: replace 'abuse' with 'cyberguy3k') "Nick Alexander" 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 |
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Can I degauss my TV with a magnet?
If you mean a permanent magnet, no, that's what caused the problem in the
first place. Most TV's have a built-in degaussing circuit that works automatically when the set is switched on. Otherwise, you need to use a degaussing coil, powered by AC. I have also used an AC powered demagnetizer (for erasing recording tape) made by R. B. Annis. You start by applying power to the coil. Move it close to the screen and around in a circular motion to cover the entire area, then gradually move it a couple of feet away and turn the power off. -Ron (email: replace 'abuse' with 'cyberguy3k') "Nick Alexander" 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 |
#4
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Can I degauss my TV with a magnet?
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 ========================================= "Nick Alexander" wrote in message ... 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 |
#5
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Can I degauss my TV with a magnet?
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 ========================================= "Nick Alexander" wrote in message ... 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 |
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Can I degauss my TV with a magnet?
"Nick Alexander" 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/ 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. |
#7
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Can I degauss my TV with a magnet?
"Nick Alexander" 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/ 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. |
#8
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Can I degauss my TV with a magnet?
Sam Goldwasser wrote: "Nick Alexander" 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 |
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Can I degauss my TV with a magnet?
Sam Goldwasser wrote: "Nick Alexander" 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 |
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Can I degauss my TV with a magnet?
On Sat, 10 Apr 2004 17:11:30 +1200, Nick Alexander
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 Note: Ensure correct polarity prior to connection. |
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Can I degauss my TV with a magnet?
On Sat, 10 Apr 2004 17:11:30 +1200, Nick Alexander
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 Note: Ensure correct polarity prior to connection. |
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Can I degauss my TV with a magnet?
On 10 Apr 2004 08:13:25 -0400, Sam Goldwasser
wrote: "Nick Alexander" 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. 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. -- ajb "If the spirit of the ruler rise up against thee, leave not thy place; for yielding pacifieth great offences." (Ecclesiastes 10-4) |
#13
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Can I degauss my TV with a magnet?
On 10 Apr 2004 08:13:25 -0400, Sam Goldwasser
wrote: "Nick Alexander" 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. 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. -- ajb "If the spirit of the ruler rise up against thee, leave not thy place; for yielding pacifieth great offences." (Ecclesiastes 10-4) |
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Can I degauss my TV with a magnet?
ajb 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. |
#15
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Can I degauss my TV with a magnet?
ajb 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. |
#16
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Can I degauss my TV with a magnet?
On Sat, 10 Apr 2004 17:11:30 +1200, "Nick Alexander"
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 |
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Can I degauss my TV with a magnet?
On Sat, 10 Apr 2004 17:11:30 +1200, "Nick Alexander"
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 |
#18
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Can I degauss my TV with a magnet?
Or get an old degaussingcoil, mount it safely into a bigger wooden box,
place a pushbutton (contact when pussed) then connect it to the mains. Usage is to switch of the tv, put everything away like waches and other magneticly to disturbing parts. Put it to the face of the picturetube, push the button and walk away straight ahead from the tv and release the switch at 1,5 meter or 5 foot. Greetings Peter "John Todd" schreef in bericht ... On Sat, 10 Apr 2004 17:11:30 +1200, Nick Alexander 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 Note: Ensure correct polarity prior to connection. |
#19
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Can I degauss my TV with a magnet?
Or get an old degaussingcoil, mount it safely into a bigger wooden box,
place a pushbutton (contact when pussed) then connect it to the mains. Usage is to switch of the tv, put everything away like waches and other magneticly to disturbing parts. Put it to the face of the picturetube, push the button and walk away straight ahead from the tv and release the switch at 1,5 meter or 5 foot. Greetings Peter "John Todd" schreef in bericht ... On Sat, 10 Apr 2004 17:11:30 +1200, Nick Alexander 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 Note: Ensure correct polarity prior to connection. |
#20
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Can I degauss my TV with a magnet?
So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. |
#21
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Can I degauss my TV with a magnet?
So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. |
#22
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Can I degauss my TV with a magnet?
On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez"
wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
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Can I degauss my TV with a magnet?
On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez"
wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
#24
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Can I degauss my TV with a magnet?
I seriously doubt this will fix anything. If it ever worked for you,
consider yourself lucky. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "JD" wrote in message ... Place a small speaker or 2 on top of the tv or near it, with the tv on, turn or angle it until the color goes back to normal. but you have to leave the speaker their for a week or more. wrote in message ... On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez" wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
#25
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Can I degauss my TV with a magnet?
I seriously doubt this will fix anything. If it ever worked for you,
consider yourself lucky. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "JD" wrote in message ... Place a small speaker or 2 on top of the tv or near it, with the tv on, turn or angle it until the color goes back to normal. but you have to leave the speaker their for a week or more. wrote in message ... On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez" wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
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Can I degauss my TV with a magnet?
Place a small speaker or 2 on top of the tv or near it, with the tv on, turn
or angle it until the color goes back to normal. but you have to leave the speaker their for a week or more. wrote in message ... On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez" wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
#27
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Can I degauss my TV with a magnet?
Place a small speaker or 2 on top of the tv or near it, with the tv on, turn
or angle it until the color goes back to normal. but you have to leave the speaker their for a week or more. wrote in message ... On Mon, 12 Apr 2004 10:10:51 -0500, "George R. Gonzalez" wrote: So much disinformation! You can demagnetize the TV with a magnet, no problem, just takes 30 seconds of careful waving it around. Start out close to the TV twirling the magnet around so that both North and South ends of the magnet alternately point toward the TV. Keep twirling while you slowly move the magnet farther away. Keep doing this until you can't see any effects on the screen. Don't worry very much about any *stationary* magnets, like speaker magnets near your TV. The most they can do is make the whole picture deflect a bit. If you don't notice any slant or twist to the picture, you can live with the magnets. To get color effects, the magnets would have to be MOVING in order to magnetize the CRT mask. Not moving ==no magnetizing of the mask == no color funnies. Of course a real strong magnet can deform or damage the shadow mask. I had a co-worker who didn't believe me and stuck a magnet from a HD on his monitor - permanent fuzzy spot. BTW, this magnet has no problem holding a magazine to my office wall that has metal studs under the drywall. -Chris. |
#28
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Can I degauss my TV with a magnet?
Sure you can. You must spin the magnet with a motor to generate an alternating
magnetic field, then bring this field towards and away from the tube very slowly to "erase" the permanent magnetization that caused the green spot. An Alnico horseshoe magnet with mounting hole at the bride, a bolt, and an electric drill might do, but this reply is intended to generate some controversy so I will include the fact that rotating a permanent magnet on any conceivable axis with any conceivable equipment generates an alternating field of much lower quality than that produced by house current through the usual degaussing coil. Don't mean to stir up the water, but you can tinker with this to learn something, then degauss properly. You see, the alternating field must completely and symmetrically reverse to average out to null. A rotating permanent magnet can have a bias on some axis. Yours, Doug Goncz ( ftp://users.aol.com/DGoncz/ ) My physics project at NVCC: http://groups.google.com/groups?q=dgoncz&scoring=d plus "bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc. in the search box |
#29
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Can I degauss my TV with a magnet?
Sure you can. You must spin the magnet with a motor to generate an alternating
magnetic field, then bring this field towards and away from the tube very slowly to "erase" the permanent magnetization that caused the green spot. An Alnico horseshoe magnet with mounting hole at the bride, a bolt, and an electric drill might do, but this reply is intended to generate some controversy so I will include the fact that rotating a permanent magnet on any conceivable axis with any conceivable equipment generates an alternating field of much lower quality than that produced by house current through the usual degaussing coil. Don't mean to stir up the water, but you can tinker with this to learn something, then degauss properly. You see, the alternating field must completely and symmetrically reverse to average out to null. A rotating permanent magnet can have a bias on some axis. Yours, Doug Goncz ( ftp://users.aol.com/DGoncz/ ) My physics project at NVCC: http://groups.google.com/groups?q=dgoncz&scoring=d plus "bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc. in the search box |
#31
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Can I degauss my TV with a magnet?
na writes:
What the hell are people giving out the wrong way to degause a crt. Here's how u do it: with tv on, unplug it from ac mains (power from the wall), wait 5 sec, plug it back in & turn it on. the built in degausing coil will degaus tube. every color tv or monitor has a built in degausing coil. Yes, but your method may not work as some/many/most require time for a thermistor to cool down. 20 seconds on, 20 minutes off, few cycles like that may be needed. --- 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. |
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