AOC 7vlr excessive HV
I have this monitor, and when you power it on, it will degauss.
The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
If you are getting arcing at the spark gaps with the tube socket pulled,
it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
If you are getting arcing at the spark gaps with the tube socket pulled,
it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
well, what I meant was, there isnt any arching in the spark gaps. the
arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
well, what I meant was, there isnt any arching in the spark gaps. the
arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
That dont make sense. With those 2 Wires out, theres really not alot of
Voltage typicly on the other pins If I recall. The R-G-B Drives are what? Maybe 60-80 VDC max, and DC usually does not arc very often when its that low. Is there junk on the board you can clean? Else I would Remove and Inspect the Socket for defects. "Mike" wrote in message ... well, what I meant was, there isnt any arching in the spark gaps. the arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
That dont make sense. With those 2 Wires out, theres really not alot of
Voltage typicly on the other pins If I recall. The R-G-B Drives are what? Maybe 60-80 VDC max, and DC usually does not arc very often when its that low. Is there junk on the board you can clean? Else I would Remove and Inspect the Socket for defects. "Mike" wrote in message ... well, what I meant was, there isnt any arching in the spark gaps. the arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
it doesnt make since. thats why im asking.
"techforce" wrote in message t... That dont make sense. With those 2 Wires out, theres really not alot of Voltage typicly on the other pins If I recall. The R-G-B Drives are what? Maybe 60-80 VDC max, and DC usually does not arc very often when its that low. Is there junk on the board you can clean? Else I would Remove and Inspect the Socket for defects. "Mike" wrote in message ... well, what I meant was, there isnt any arching in the spark gaps. the arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
it doesnt make since. thats why im asking.
"techforce" wrote in message t... That dont make sense. With those 2 Wires out, theres really not alot of Voltage typicly on the other pins If I recall. The R-G-B Drives are what? Maybe 60-80 VDC max, and DC usually does not arc very often when its that low. Is there junk on the board you can clean? Else I would Remove and Inspect the Socket for defects. "Mike" wrote in message ... well, what I meant was, there isnt any arching in the spark gaps. the arching is inside the tube socket. at first, i sen the arching between the 2 focus leads. If i pull out BOTH leads, and leave them apart from each other, then when i try to power it up, it will arch in the tube socket again, but this time somewhere else between 2 or so pin connectors. "Sam Goldwasser" wrote in message ... If you are getting arcing at the spark gaps with the tube socket pulled, it may also be a short in the flyback causing the focus voltage to be excessive, but not necessarily the HV. --- 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 at repairfaq.org. Thanks. "Mike" writes: I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
"Mike" wrote in message ...
it doesnt make since. thats why im asking. The sets that I have had that were arching in the CRT socket had problems in the high-voltage transformer (flyback) allowing the high-voltage to reach the focus pins. I had measured about 20KV at the focus pins (set running) when it should have been in the range of 6 to 8 KV. Have you measured the voltage on the focus pins ? It is possible that the high-voltage is getting to the G1 (screen) pot on the flyback, causing the screen voltage to be way too high. It should be in the range of 400 to 600 volts (measured with a 100 to 1 probe). The screen voltage is very high impedence and is usually over-loaded by the regular meter (regular meter might read about 200-300 volts). Hope this helps... John |
AOC 7vlr excessive HV
"Mike" wrote in message ...
it doesnt make since. thats why im asking. The sets that I have had that were arching in the CRT socket had problems in the high-voltage transformer (flyback) allowing the high-voltage to reach the focus pins. I had measured about 20KV at the focus pins (set running) when it should have been in the range of 6 to 8 KV. Have you measured the voltage on the focus pins ? It is possible that the high-voltage is getting to the G1 (screen) pot on the flyback, causing the screen voltage to be way too high. It should be in the range of 400 to 600 volts (measured with a 100 to 1 probe). The screen voltage is very high impedence and is usually over-loaded by the regular meter (regular meter might read about 200-300 volts). Hope this helps... John |
AOC 7vlr excessive HV
your probably right.
if it were an open hold-down cap, it would arc around the aquadag. Where can i get the flybacks for these? im not that familar with computer monitor flyback replacements. ive replaced dosens in TV sets. "John Gill" wrote in message om... "Mike" wrote in message ... it doesnt make since. thats why im asking. The sets that I have had that were arching in the CRT socket had problems in the high-voltage transformer (flyback) allowing the high-voltage to reach the focus pins. I had measured about 20KV at the focus pins (set running) when it should have been in the range of 6 to 8 KV. Have you measured the voltage on the focus pins ? It is possible that the high-voltage is getting to the G1 (screen) pot on the flyback, causing the screen voltage to be way too high. It should be in the range of 400 to 600 volts (measured with a 100 to 1 probe). The screen voltage is very high impedence and is usually over-loaded by the regular meter (regular meter might read about 200-300 volts). Hope this helps... John |
AOC 7vlr excessive HV
your probably right.
if it were an open hold-down cap, it would arc around the aquadag. Where can i get the flybacks for these? im not that familar with computer monitor flyback replacements. ive replaced dosens in TV sets. "John Gill" wrote in message om... "Mike" wrote in message ... it doesnt make since. thats why im asking. The sets that I have had that were arching in the CRT socket had problems in the high-voltage transformer (flyback) allowing the high-voltage to reach the focus pins. I had measured about 20KV at the focus pins (set running) when it should have been in the range of 6 to 8 KV. Have you measured the voltage on the focus pins ? It is possible that the high-voltage is getting to the G1 (screen) pot on the flyback, causing the screen voltage to be way too high. It should be in the range of 400 to 600 volts (measured with a 100 to 1 probe). The screen voltage is very high impedence and is usually over-loaded by the regular meter (regular meter might read about 200-300 volts). Hope this helps... John |
AOC 7vlr excessive HV
yeap, your right. bad fly.
i removed both focus wires, AND ISOLATED THEM APART, alot farther from each other. no more cracking. but the high voltege comes up, and its on for a second, it makes a hiss and shuts down, and tries again over and over. the way it sounds, it sounds like a techno beat. im thinking the uPC is seeing the shorted windings between the HV and focus windings, and shutting it down. Anybody know where I can get the flybacks for these? "Mike" wrote in message ... I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
AOC 7vlr excessive HV
yeap, your right. bad fly.
i removed both focus wires, AND ISOLATED THEM APART, alot farther from each other. no more cracking. but the high voltege comes up, and its on for a second, it makes a hiss and shuts down, and tries again over and over. the way it sounds, it sounds like a techno beat. im thinking the uPC is seeing the shorted windings between the HV and focus windings, and shutting it down. Anybody know where I can get the flybacks for these? "Mike" wrote in message ... I have this monitor, and when you power it on, it will degauss. The HV will kick up, and a loud snap is heard and it is shut down. the HV sounded kinda strong in the first place. after close examination, it was arching in the tube socked. I pulled the tube socket and tried it again. and i could see the internal spark between where the 2 focus leads go into the socket. I pull one of them and tried again, this time I seen an arc with the same magnitude somewhere else in the tube socket. Sounds as if the HV is going exessive and shutting down. In other words, im guessing the safty hold-down capacitors. Any ideas? |
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