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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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Powering up an ATX PS ?
Hi,
I've got an ATX computer PS pulled from an old computer. I know that 2 of the 20 pins on the ATX power plug have to be jumpered in order for the thing to power up .. not sure which ones .. was it 13-14? ... Also, after those are jumped, what turns on the supply? Normally, there's a push button on the computer which goes to a 2 pin header on the MB, which I assume sends some sort of "power up" signal to the ATX supply ... how do I fake that out? Thanks, Bill |
#2
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Powering up an ATX PS ?
On Wed, 26 Oct 2005 06:23:45 -0400, Darmok
wrote: Hi, I've got an ATX computer PS pulled from an old computer. I know that 2 of the 20 pins on the ATX power plug have to be jumpered in order for the thing to power up .. not sure which ones .. was it 13-14? ... Also, after those are jumped, what turns on the supply? Normally, there's a push button on the computer which goes to a 2 pin header on the MB, which I assume sends some sort of "power up" signal to the ATX supply ... how do I fake that out? Thanks, Bill See http://www.pavouk.comp.cz/hw/en_atxps.html For a schematic of an ATX supply. We owe Pavel Ruzicka for taking the time to reverse engineer it. The info you're looking for is in the theory of operation on the site. The start up line 5V start bus is a separate tiny supply that is running whenever the computer is plugged in (and turned on) It shares the input rectifier and filters with the main supply but is otherwise totally independent. A little three terminal regulator handles the output. -- ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#3
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Powering up an ATX PS ?
default wrote in :
On Wed, 26 Oct 2005 06:23:45 -0400, Darmok wrote: Hi, I've got an ATX computer PS pulled from an old computer. I know that 2 of the 20 pins on the ATX power plug have to be jumpered in order for the thing to power up .. not sure which ones .. was it 13-14? ... Also, after those are jumped, what turns on the supply? Normally, there's a push button on the computer which goes to a 2 pin header on the MB, which I assume sends some sort of "power up" signal to the ATX supply ... how do I fake that out? Thanks, Bill See http://www.pavouk.comp.cz/hw/en_atxps.html For a schematic of an ATX supply. We owe Pavel Ruzicka for taking the time to reverse engineer it. The info you're looking for is in the theory of operation on the site. The start up line 5V start bus is a separate tiny supply that is running whenever the computer is plugged in (and turned on) It shares the input rectifier and filters with the main supply but is otherwise totally independent. A little three terminal regulator handles the output. He probably needs a minimum load on the PS output,too,most likely the +5V line. -- Jim Yanik jyanik at kua.net |
#4
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Powering up an ATX PS ?
On 26 Oct 2005 12:03:41 GMT, Jim Yanik wrote:
default wrote in : On Wed, 26 Oct 2005 06:23:45 -0400, Darmok wrote: Hi, I've got an ATX computer PS pulled from an old computer. I know that 2 of the 20 pins on the ATX power plug have to be jumpered in order for the thing to power up .. not sure which ones .. was it 13-14? ... Also, after those are jumped, what turns on the supply? Normally, there's a push button on the computer which goes to a 2 pin header on the MB, which I assume sends some sort of "power up" signal to the ATX supply ... how do I fake that out? Thanks, Bill See http://www.pavouk.comp.cz/hw/en_atxps.html For a schematic of an ATX supply. We owe Pavel Ruzicka for taking the time to reverse engineer it. The info you're looking for is in the theory of operation on the site. The start up line 5V start bus is a separate tiny supply that is running whenever the computer is plugged in (and turned on) It shares the input rectifier and filters with the main supply but is otherwise totally independent. A little three terminal regulator handles the output. He probably needs a minimum load on the PS output,too,most likely the +5V line. Possibly. The ATX diagram is representative of the type. In this particular one both the +5 and +12 / -12 are referenced back to the PWM via a voltage divider, which would suggest one or some combination of supplies might need some minimum load to regulate properly. Hopefully he understands how dangerous the input circuits can be . . . never mind the outputs. The schematic does show some (minimal) load resistors on the outputs. A good basic info on switching supplies: http://repairfaq.ece.drexel.edu/sam/smpsfaq.htm A better text on switching supplies with instructions on starting an ATX and using a dummy load on the +5 supply: http://www.wies-hs.eu.dodea.edu/Cour...oc/TrbPSGD.pdf -- ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
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Powering up an ATX PS ?
I think CompUSA sells a PS tester. This gets by all of those wiring and
switch problems. It is only about $20.00 |
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Powering up an ATX PS ?
writes:
I think CompUSA sells a PS tester. This gets by all of those wiring and switch problems. It is only about $20.00 What more is there than jumpering the Power_Supply_On wire to ground with a load on the output? --- 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 is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#7
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Powering up an ATX PS ?
"Sam Goldwasser" wrote in message
... writes: I think CompUSA sells a PS tester. This gets by all of those wiring and switch problems. It is only about $20.00 What more is there than jumpering the Power_Supply_On wire to ground with a load on the output? --- 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 is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. That's pretty much all there is to those little cheapie testers... A little box containing a minimal load, some LEDs that give a go//nogo indication of all the voltages, a switch that lets you turn the PS on-off from the box and an instruction sheet that was written by a Chinese housewife and translated into English by a Russian schoolboy. -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Never take a laxative and a sleeping pill at the same time!! |
#8
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Powering up an ATX PS ?
DaveM wrote:
That's pretty much all there is to those little cheapie testers... A little box containing a minimal load, some LEDs that give a go//nogo indication of all the voltages, a switch that lets you turn the PS on-off from the box and an instruction sheet that was written by a Chinese housewife and translated into English by a Russian schoolboy. Years ago I was asked to do some product manuals for a company that didn't exactly have a manual writer. I asked for a few examples of current manuals. One I was handed was pretty bad, and I jokingly said that it looked like it was written by a 20 year old exchange student from Iran. Without smiling, the lady told me it had been written by the designer, a 22-year-old exchange student from Turkey. She wasn't kidding, she knew the guy. -- If John McCain gets the 2008 Republican Presidential nomination, my vote for President will be a write-in for Jiang Zemin. |
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