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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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CRT tube - Releasing vacuum for tube removal/disposal
I need to remove the picture tube from a 14" computer monitor. I'd like
to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon |
#2
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CRT tube - Releasing vacuum for tube removal/disposal
Simon Webberist wrote in
message ... I need to remove the picture tube from a 14" computer monitor. I'd like to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon Making defunct CRTs safe To release the vacuum inside a CRT.Remove the multipole connector from the neck of the tube and at the centre usually is the point where the air is evacuated originally and is usually the weakest point.Take outdoors and place CRT-face down on cardboard or similar on the ground and cover the whole CRT with something like the composite back pannel off the TV with just the centre of the CRT neck exposed.Wearing goggles lightly tap the weak point with a centre-punch and light hammer to crack the glass just at this evacuation point.I've never known the whole CRT tube to implode doing this but the extra protective cover should be used. off my tips file http://www.divdev.fsnet.co.uk/tips.htm I must have done this to 50 CRTs over the years and nothing more than a hiss of air inrush -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
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CRT tube - Releasing vacuum for tube removal/disposal
Simon Webberist wrote:
releasing vacuum from crt: remove pcb from crt base, where the ring of pins is. In the middle of that is a glass nipple, breaking this is the safest way to defuse the bomb. Stand tv upright as usual, place metal bar one end on ground, other end on the glass nipple. Retreat round corner of building if paranoid or litigious, or you may become so at any time, and whack the metal bar downwards with something hard. Sweep up any broken bits, sometimes the neck end can break. I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. leave that alone! A crt broken in the wrong way can go off like a small bomb. If you take the vacuum out, wher has it gone? NT |
#4
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CRT tube - Releasing vacuum for tube removal/disposal
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#5
Posted to sci.electronics.repair
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CRT tube - Releasing vacuum for tube removal/disposal
Simon Webberist wrote:
I need to remove the picture tube from a 14" computer monitor. I'd like to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon |
#7
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CRT tube - Releasing vacuum for tube removal/disposal
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#8
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CRT tube - Releasing vacuum for tube removal/disposal
jakdedert wrote:
wrote: Simon Webberist wrote: releasing vacuum from crt: remove pcb from crt base, where the ring of pins is. In the middle of that is a glass nipple, breaking this is the safest way to defuse the bomb. Stand tv upright as usual, place metal bar one end on ground, other end on the glass nipple. Retreat round corner of building if paranoid or litigious, or you may become so at any time, and whack the metal bar downwards with something hard. Sweep up any broken bits, sometimes the neck end can break. I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. leave that alone! A crt broken in the wrong way can go off like a small bomb. If you take the vacuum out, wher has it gone? NT My favorite way? 1) Set the monitor/tv out in an open field. 2) Carefully take aim with whatever firearm you possess. 3) Fire 4) If desired effect* not achieved, repeat steps 1 - 3 above. Why do you have to repeat step #1? ;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#9
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CRT tube - Releasing vacuum for tube removal/disposal
Simple ..I must have done a hundred that way...
Making defunct CRTs safe........etc etc etc Put it in box look the other way smack the neck with a hammer...job done. No science here ...yikes |
#10
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CRT tube - Releasing vacuum for tube removal/disposal
"Bud--" wrote in message ... Long ago in high school a couple teachers wanted to see how explosive a crt acutally is. They tossed a small 7" crt into an empty room, immediately closing the door. They found glass everywhere, including on top of the window frames. I recall the tale of an Australian serviceman who was replacing a tube and requested that the family leave the room with their dog. They declined and he proceeded. While removing the tube he tripped over the dog and a full implosion occurred. After that they left the room. It's not clear how long it took to remove the shards of glass from every surface in there. Even he was impressed. |
#11
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CRT tube - Releasing vacuum for tube removal/disposal
Simple enough but how do you dispose of the materials the crt is composed
of, such as the poisonous phosphor coatings and the leaded glass? Many areas consider these items HAZMAT and need to be handled appropriately. "CRaSH" wrote in message news:GK%Gg.492$B14.194@dukeread03... Simon Webberist wrote: I need to remove the picture tube from a 14" computer monitor. I'd like to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon |
#12
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CRT tube - Releasing vacuum for tube removal/disposal
Pair of pliers is what you need. Remove the back cap on the neck by
twisting it off with the pliers. Now, you will see a glass tip ... crush it with the pliers. Eye protection is recommended. |
#13
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CRT tube - Releasing vacuum for tube removal/disposal
Michael A. Terrell wrote:
jakdedert wrote: wrote: Simon Webberist wrote: releasing vacuum from crt: remove pcb from crt base, where the ring of pins is. In the middle of that is a glass nipple, breaking this is the safest way to defuse the bomb. Stand tv upright as usual, place metal bar one end on ground, other end on the glass nipple. Retreat round corner of building if paranoid or litigious, or you may become so at any time, and whack the metal bar downwards with something hard. Sweep up any broken bits, sometimes the neck end can break. I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. leave that alone! A crt broken in the wrong way can go off like a small bomb. If you take the vacuum out, wher has it gone? NT My favorite way? 1) Set the monitor/tv out in an open field. 2) Carefully take aim with whatever firearm you possess. 3) Fire 4) If desired effect* not achieved, repeat steps 1 - 3 above. Why do you have to repeat step #1? ;-) Gotta point there...might have to move a little closer, though.g jak |
#14
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CRT tube - Releasing vacuum for tube removal/disposal
jakdedert wrote:
Michael A. Terrell wrote: jakdedert wrote: wrote: Simon Webberist wrote: releasing vacuum from crt: remove pcb from crt base, where the ring of pins is. In the middle of that is a glass nipple, breaking this is the safest way to defuse the bomb. Stand tv upright as usual, place metal bar one end on ground, other end on the glass nipple. Retreat round corner of building if paranoid or litigious, or you may become so at any time, and whack the metal bar downwards with something hard. Sweep up any broken bits, sometimes the neck end can break. I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. leave that alone! A crt broken in the wrong way can go off like a small bomb. If you take the vacuum out, wher has it gone? NT My favorite way? 1) Set the monitor/tv out in an open field. 2) Carefully take aim with whatever firearm you possess. 3) Fire 4) If desired effect* not achieved, repeat steps 1 - 3 above. Why do you have to repeat step #1? ;-) Gotta point there...might have to move a little closer, though.g jak I thought it might be gun shy and tried to run away. ;-) My favorite trick was to remove the plastic guide and use a tiny triangle file on the thinnest part of the glass, till it started hissing. Some were still hissing the next morning. It also scared the hell out of people that weren't supposed to be in that part of the shop. ;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#15
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CRT tube - Releasing vacuum for tube removal/disposal
Simon Webberist wrote: I need to remove the picture tube from a 14" computer monitor. I'd like to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon I've only done this with Trinitrons. Small scratch awl in the anode connection and bop it with a small wieght - a pliers is just fine. It pokes a little hole to let the air back in (the vacuum out). It just hisses quietly for a short time. The 20" one was pretty cool but usually they're just 14" bottles. GG |
#16
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CRT tube - Releasing vacuum for tube removal/disposal
Michael A. Terrell wrote:
jakdedert wrote: Michael A. Terrell wrote: jakdedert wrote: wrote: Simon Webberist wrote: releasing vacuum from crt: remove pcb from crt base, where the ring of pins is. In the middle of that is a glass nipple, breaking this is the safest way to defuse the bomb. Stand tv upright as usual, place metal bar one end on ground, other end on the glass nipple. Retreat round corner of building if paranoid or litigious, or you may become so at any time, and whack the metal bar downwards with something hard. Sweep up any broken bits, sometimes the neck end can break. I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. leave that alone! A crt broken in the wrong way can go off like a small bomb. If you take the vacuum out, wher has it gone? NT My favorite way? 1) Set the monitor/tv out in an open field. 2) Carefully take aim with whatever firearm you possess. 3) Fire 4) If desired effect* not achieved, repeat steps 1 - 3 above. Why do you have to repeat step #1? ;-) Gotta point there...might have to move a little closer, though.g jak I thought it might be gun shy and tried to run away. ;-) My favorite trick was to remove the plastic guide and use a tiny triangle file on the thinnest part of the glass, till it started hissing. Some were still hissing the next morning. It also scared the hell out of people that weren't supposed to be in that part of the shop. ;-) Considering that I don't even own a gun anymore.... I was surprised a couple of times by how 'gently' the vacuum can be breached. I once did some work on a tv, set it aside for some reason with the back in place, but unattached. Shortly thereafter, I happened to bump the set and the back fell down on the neck...hisssssss. Another candidate for the dumpster. jak |
#17
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CRT tube - Releasing vacuum for tube removal/disposal
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#18
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CRT tube - Releasing vacuum for tube removal/disposal
jakdedert wrote:
Michael A. Terrell wrote: jakdedert wrote: Michael A. Terrell wrote: I thought it might be gun shy and tried to run away. ;-) My favorite trick was to remove the plastic guide and use a tiny triangle file on the thinnest part of the glass, till it started hissing. Some were still hissing the next morning. It also scared the hell out of people that weren't supposed to be in that part of the shop. ;-) Considering that I don't even own a gun anymore.... I was surprised a couple of times by how 'gently' the vacuum can be breached. I once did some work on a tv, set it aside for some reason with the back in place, but unattached. Shortly thereafter, I happened to bump the set and the back fell down on the neck...hisssssss. Another candidate for the dumpster. jak I tossed one off a cliff up in Kentucky back in the mid '60s. The neck hit repeatedly on the way down, landed on it face intact. Just as I was ready to turn and climb back up the hill it imploded. You just never know. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#19
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CRT tube - Releasing vacuum for tube removal/disposal
Number 1 Wear Safety Glasses with side shields
2 Wear leather type gloves 3 Place monitor on it's face ,on the floor 4 Cover the back of the tube using a heavy carpet or blanket,with only socket projecting out 5 Socket has to be removed 6 Use a pick all or the tang of a file,tap soft glass at seal,with a small hammer 7 After hissing stops, YOU GOT IT MADE Never had a tube implode in 50 years, hundred's done 3 in. to 32 in len |
#20
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CRT tube - Releasing vacuum for tube removal/disposal
Take the monitor to a coworker of mine that thought he knew how to 'fix'
things. In the short time I worked with him, he must have snapped the yokes off of 5 TV sets and 2 monitors (plus the VCR he dropped down the stairs). The only thing that exploded was the customers anger when I told them they would not be getting their item back anytime soon! Simon Webberist wrote: I need to remove the picture tube from a 14" computer monitor. I'd like to release the vacuum first because i think i should before i remove the tensioned wires holding in the tube. I have removed the neck board and can now see the indexing plastic of the socket. That indexing plastic is siliconed on with white silicon and i can't seperate it with a knife. I'm thinking of using a dremel to saw through the indexing plastic as that is where i'm thinking i should be filing then snapping off anyway. Does this sound like the way to go? I really want to release the vacuum. How do people usually let out the vacuum? I pulled off the Ultor cap where the annode lead attaches, but it's all glass under it, theres no metal i can drill. from the faq: http://www.repairfaq.org/REPAIR/F_mo...ml#MONFAQD_011 "The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be some moderately hazardous materials" I tried searching google, but I couldn't come up with anything except the same FAQ. Thanks, Simon |
#21
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CRT tube - Releasing vacuum for tube removal/disposal
1. remove back cover of unit. 2. take outside 3. toss into skip /dumpster/bin hard , tube neck downwards. the end. |
#22
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CRT tube - Releasing vacuum for tube removal/disposal
b wrote:
1. remove back cover of unit. 2. take outside 3. toss into skip /dumpster/bin hard , tube neck downwards. the end. Its more fun to use a very small triangle file. File a groove in the seal at the end of the neck, till it just barely starts to hiss, then see people running out every door. Yes, I DO have a very warped sense of humor, but I have done this a few times. One of them hissed for days.;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#23
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CRT tube - Releasing vacuum for tube removal/disposal
YOU TOO !!! :-) I used to take the pliers and crunch the nipple off
the back and let it hiss and some people would freek out and get back . |
#24
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CRT tube - Releasing vacuum for tube removal/disposal
"Ken G." wrote:
YOU TOO !!! :-) I used to take the pliers and crunch the nipple off the back and let it hiss and some people would freek out and get back . The file gives a very faint hiss. First they are looking for the sound, then they freak out. ;-) -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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