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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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Failure resulting in hole punched in GE CFL
This one was rather strange, at least to me.
One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#2
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Failure resulting in hole punched in GE CFL
Sam Goldwasser wrote: This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? Not often, but then I usually just replace bad bulbs. -- http://improve-usenet.org/index.html aioe.org, Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you're crazy. |
#3
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Failure resulting in hole punched in GE CFL
"Michael A. Terrell" writes:
Sam Goldwasser wrote: This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? Not often, but then I usually just replace bad bulbs. What fun is that? --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#4
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Failure resulting in hole punched in GE CFL
Sam Goldwasser wrote in message
... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#5
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Failure resulting in hole punched in GE CFL
Sam Goldwasser wrote: "Michael A. Terrell" writes: Sam Goldwasser wrote: This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? Not often, but then I usually just replace bad bulbs. What fun is that? Unfortunately my fun days left when I became disabled. I used to grab every dead 'unrepairable' module at work to do my own failure analysis, but that is just a fond memory now. I repaired dead motherboards, hard drives and cards for various computers at the component level, for fun. Hell, I used to read IC databooks for fun. I still have a couple hundred in my personal library. I moved & rebuilt a 1952 model RCA UHF TV transmitter once, then reassembled it, then troubleshot all the problems that has caused it to be retired. That project took about six months. -- http://improve-usenet.org/index.html aioe.org, Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you're crazy. |
#6
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Failure resulting in hole punched in GE CFL
On Thu, 25 Dec 2008 14:28:43 -0000, "N_Cook" put
finger to keyboard and composed: Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? If this was a real problem, then wouldn't you expect to see these kinds of failures in the long, straight, horizontally mounted fluorescent tubes? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#7
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Failure resulting in hole punched in GE CFL
On Wed, 24 Dec 2008 19:23:52 -0500, Sam Goldwasser
put finger to keyboard and composed: This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? A colleague claims that he witnessed a case where the neck of Philips CRT was pinholed when his colleague removed the tuning capacitor in the line stage. shrug BTW, I've had a bad run with Edapt CFLs. Typical faults include dry joints, O/C startup resistors, and O/C filaments. Strangely, in the latter case the lamp flashes once when I touch it. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#8
Posted to sci.electronics.repair
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Failure resulting in hole punched in GE CFL
"N_Cook" writes:
Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? I don't know. There's supposed to be very little mercury in these things though. --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#9
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Failure resulting in hole punched in GE CFL
Meat Plow writes:
On Wed, 24 Dec 2008 19:23:52 -0500, Sam Goldwasser wrote: This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? Never. What could get hot enough to do that? That's really the question. Unless as someone else suggested, that's where a bit of mercury condensed and somehow the discharge went to that instead of the filament. I have no idea if that's even possible. --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#10
Posted to sci.electronics.repair
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Failure resulting in hole punched in GE CFL
Franc Zabkar writes:
On Thu, 25 Dec 2008 14:28:43 -0000, "N_Cook" put finger to keyboard and composed: Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? If this was a real problem, then wouldn't you expect to see these kinds of failures in the long, straight, horizontally mounted fluorescent tubes? Don't know if it's a real problem, but it was a real failure. The current density is lower in the fat straight ones but since I have no idea how this happened, it's hard to even speculate on whether other types are prone to it. --- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#11
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Failure resulting in hole punched in GE CFL
On Thu, 25 Dec 2008 19:00:50 -0500, Sam Goldwasser
put finger to keyboard and composed: Franc Zabkar writes: On Thu, 25 Dec 2008 14:28:43 -0000, "N_Cook" put finger to keyboard and composed: Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? If this was a real problem, then wouldn't you expect to see these kinds of failures in the long, straight, horizontally mounted fluorescent tubes? Don't know if it's a real problem, but it was a real failure. The current density is lower in the fat straight ones but since I have no idea how this happened, it's hard to even speculate on whether other types are prone to it. I'd return the faulty CFL to GE with a comment to the effect that a lamp that leaks mercury into the household atmosphere is a potentially serious health hazard. Ask them how long it will be before you will be able to tell whether the toxins have poisoned your liver. I guarantee you'll get a box full of free replacements in a matter of days. :-) - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#12
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Failure resulting in hole punched in GE CFL
On Dec 25, 6:54*pm, Franc Zabkar wrote:
On Thu, 25 Dec 2008 19:00:50 -0500, Sam Goldwasser put finger to keyboard and composed: Franc Zabkar writes: On Thu, 25 Dec 2008 14:28:43 -0000, "N_Cook" put finger to keyboard and composed: Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. *It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. *A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? If this was a real problem, then wouldn't you expect to see these kinds of failures in the long, straight, horizontally mounted fluorescent tubes? Don't know if it's a real problem, but it was a real failure. The current density is lower in the fat straight ones but since I have no idea how this happened, it's hard to even speculate on whether other types are prone to it. I'd return the faulty CFL to GE with a comment to the effect that a lamp that leaks mercury into the household atmosphere is a potentially serious health hazard. Ask them how long it will be before you will be able to tell whether the toxins have poisoned your liver. I guarantee you'll get a box full of free replacements in a matter of days. :-) - Franc Zabkar -- Please remove one 'i' from my address when replying by email.- Hide quoted text - - Show quoted text - Please let us know what GE says when you contact them!!!! |
#13
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Failure resulting in hole punched in GE CFL
On Fri, 26 Dec 2008 00:54:57 -0000, Franc Zabkar wrote:
On Thu, 25 Dec 2008 19:00:50 -0500, Sam Goldwasser put finger to keyboard and composed: Franc Zabkar writes: On Thu, 25 Dec 2008 14:28:43 -0000, "N_Cook" put finger to keyboard and composed: Sam Goldwasser wrote in message ... This one was rather strange, at least to me. One of two horizontally mounted spiral GE CFLs in a semi-enclosed fixture simply winked out. It's one I had repaired cracked solder joints on a year or so ago so I figured time to resolder if the transistors/MOSFETs weren't toast. Checked all common suspects for shorts/opens as well as the lamp for good filaments, no problesm found. Resoldered some questionable joints - no sign of life. Then I noticed IT - a dimple near one end of the tube and a resistor lead could be inserted straight into the inside. A pinpoint on the inside surface of the glass must have gotten really hot. How often do you see that? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Is the keyphrase "horizontally mounted " and the hole was where the mercury condensed into a ball ? If this was a real problem, then wouldn't you expect to see these kinds of failures in the long, straight, horizontally mounted fluorescent tubes? Don't know if it's a real problem, but it was a real failure. The current density is lower in the fat straight ones but since I have no idea how this happened, it's hard to even speculate on whether other types are prone to it. I'd return the faulty CFL to GE with a comment to the effect that a lamp that leaks mercury into the household atmosphere is a potentially serious health hazard. Ask them how long it will be before you will be able to tell whether the toxins have poisoned your liver. I guarantee you'll get a box full of free replacements in a matter of days. :-) I assume the amount of mercury isn't enough to hurt anyone, I mean how often do these things get smashed by clumsy people? -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com If you eat a judge's uniform you might contract a lawsuit. |
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