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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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#1
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Fixed a noisy yoke
Some of you may recall my thread, titled "Buzzing flyback," about a sound
that turned out to be coming from the deflection yoke in a computer monitor. I fixed it with PVC pipe cement, which is a cheap and readily available, versatile plastic sealant. I poured about an ounce of it slowly all over and into the yoke, including the space between the yoke and the CRT. Specifically, I found a position in which the monitor wasn't noisy (lying on its side) and did much of the pouring from that direction, to try to fix the loose part (whatever it might be) in that position. It worked. Because the cement is flammable, you should always let the monitor cool down before applying it, then let it dry for several hours, until the smell is almost gone. |
#2
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Fixed a noisy yoke
On the NAP chassis' I found the easiest way is to simply turn it upside down,
reverse the plugs and reset the purity/convergence. I realize this may not be possible on a computer monitor because there are usually a few tertiary coils, and even on an NTSC set it's probably not the best solution. The NAP lends itself well to the procedure though because the H & V windings are on seperate plugs. JURB |
#3
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Fixed a noisy yoke
another thing you forgot to mention is the high voltage risks.
In article , Michael A. Covington wrote: Some of you may recall my thread, titled "Buzzing flyback," about a sound that turned out to be coming from the deflection yoke in a computer monitor. I fixed it with PVC pipe cement, which is a cheap and readily available, versatile plastic sealant. I poured about an ounce of it slowly all over and into the yoke, including the space between the yoke and the CRT. Specifically, I found a position in which the monitor wasn't noisy (lying on its side) and did much of the pouring from that direction, to try to fix the loose part (whatever it might be) in that position. It worked. Because the cement is flammable, you should always let the monitor cool down before applying it, then let it dry for several hours, until the smell is almost gone. |
#4
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Fixed a noisy yoke
"Michael A. Covington" wrote in message ...
Some of you may recall my thread, titled "Buzzing flyback," about a sound that turned out to be coming from the deflection yoke in a computer monitor. I fixed it with PVC pipe cement, which is a cheap and readily available, versatile plastic sealant. I poured about an ounce of it slowly all over and into the yoke, including the space between the yoke and the CRT. Specifically, I found a position in which the monitor wasn't noisy (lying on its side) and did much of the pouring from that direction, to try to fix the loose part (whatever it might be) in that position. It worked. Because the cement is flammable, you should always let the monitor cool down before applying it, then let it dry for several hours, until the smell is almost gone. Sort of tempted to try that but am concerned if it doesn't work for me,then I'll never be able to remove the yoke to try dipping it in a bath of lacquer or something.My unit is a Grundig television. |
#5
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Fixed a noisy yoke
"~" wrote in message ... another thing you forgot to mention is the high voltage risks. I hereby mention the high-voltage risks. |
#6
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Fixed a noisy yoke
when i have sets in with a noisy EHT transformer I use spray lacquer paint
this gets into the part that creats the noise this can be used for yokes as well. "mo" wrote in message om... "Michael A. Covington" wrote in message ... Some of you may recall my thread, titled "Buzzing flyback," about a sound that turned out to be coming from the deflection yoke in a computer monitor. I fixed it with PVC pipe cement, which is a cheap and readily available, versatile plastic sealant. I poured about an ounce of it slowly all over and into the yoke, including the space between the yoke and the CRT. Specifically, I found a position in which the monitor wasn't noisy (lying on its side) and did much of the pouring from that direction, to try to fix the loose part (whatever it might be) in that position. It worked. Because the cement is flammable, you should always let the monitor cool down before applying it, then let it dry for several hours, until the smell is almost gone. Sort of tempted to try that but am concerned if it doesn't work for me,then I'll never be able to remove the yoke to try dipping it in a bath of lacquer or something.My unit is a Grundig television. |
#7
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Fixed a noisy yoke
We used to use hot glue...
PoD "Max Harding vk3jin" maxh10(NO SPAM wrote in message u... when i have sets in with a noisy EHT transformer I use spray lacquer paint this gets into the part that creats the noise this can be used for yokes as well. "mo" wrote in message om... "Michael A. Covington" wrote in message ... Some of you may recall my thread, titled "Buzzing flyback," about a sound that turned out to be coming from the deflection yoke in a computer monitor. I fixed it with PVC pipe cement, which is a cheap and readily available, versatile plastic sealant. I poured about an ounce of it slowly all over and into the yoke, including the space between the yoke and the CRT. Specifically, I found a position in which the monitor wasn't noisy (lying on its side) and did much of the pouring from that direction, to try to fix the loose part (whatever it might be) in that position. It worked. Because the cement is flammable, you should always let the monitor cool down before applying it, then let it dry for several hours, until the smell is almost gone. Sort of tempted to try that but am concerned if it doesn't work for me,then I'll never be able to remove the yoke to try dipping it in a bath of lacquer or something.My unit is a Grundig television. |
#8
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Fixed a noisy yoke
"Max Harding vk3jin" maxh10(NO SPAM wrote in message u... when i have sets in with a noisy EHT transformer I use spray lacquer paint this gets into the part that creats the noise this can be used for yokes as well. Good idea. Thanks! |
#9
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Fixed a noisy yoke
"Max Harding vk3jin" maxh10(NO SPAM wrote in message . au...
when i have sets in with a noisy EHT transformer I use spray lacquer paint this gets into the part that creats the noise this can be used for yokes as well. What is this? Like in an aerosol can like spray paint? Wouldn't happen to have a brand name handy there Max? |
#10
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I see from your address that you are in Aussi land so go down to your local
bunnings store and you will find a can of spray clear varnish on the shelf.let it dry a day or so before you switch it on ,,,,,,,,, and yes it works, this was told to us at school.give us a bell 0419-355-306 if you want more.... i'm in melbourne vict. "mo" wrote in message om... "Max Harding vk3jin" maxh10(NO SPAM wrote in message . au... when i have sets in with a noisy EHT transformer I use spray lacquer paint this gets into the part that creats the noise this can be used for yokes as well. What is this? Like in an aerosol can like spray paint? Wouldn't happen to have a brand name handy there Max? |
#11
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"Max Harding vk3jin" maxh10(NO SPAM wrote in message . au...
I see from your address that you are in Aussi land so go down to your local bunnings store and you will find a can of spray clear varnish on the shelf.let it dry a day or so before you switch it on ,,,,,,,,, and yes it works, this was told to us at school.give us a bell 0419-355-306 if you want more.... i'm in melbourne vict. Thanks for the advice. One more question. The tube is one that don't have rings and ****.And it looks as though the factory has already at least coated the outside of the yoke with epoxy. I suppose I need to remove yoke to spray the inner windings.No? |
#12
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"Max Harding vk3jin" maxh10(NO SPAM wrote in message . au...
I see from your address that you are in Aussi land so go down to your local bunnings store and you will find a can of spray clear varnish on the shelf.let it dry a day or so before you switch it on ,,,,,,,,, and yes it works, this was told to us at school.give us a bell 0419-355-306 if you want more.... i'm in melbourne vict. The yoke has an epoxy compound over it. Do I need to remove the yoke first? A thought just occurred to me.Maybe I should remove the yoke from the neck and fire up the unit to test what difference it makes to the buzzing. Cheers Max. |
#13
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"Max Harding vk3jin" maxh10(NO SPAM wrote in message . au...
I see from your address that you are in Aussi land so go down to your local bunnings store and you will find a can of spray clear varnish on the shelf.let it dry a day or so before you switch it on ,,,,,,,,, and yes it works, this was told to us at school.give us a bell 0419-355-306 if you want more.... i'm in melbourne vict. The yoke has an epoxy compound over it. Do I need to remove the yoke first? A thought just occurred to me.Maybe I should remove the yoke from the neck and fire up the unit to test what difference it makes to the buzzing. Cheers Max. |
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