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computer power supply..
Greetings...
I have taken the power supply out of a computer... Power supply model number.. IBP-38A Does anyone know how to start it... The computer's on / off switch was / is on the front panel and the connecting wire goes to the mother board... I still have the mother board and have considered doing a board trace to track the wire to the power supply.... However to save me some time would anyone know were the start circuit is?.. Larry ve3fxq |
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computer power supply..
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computer power supply..
larya wrote:
Greetings... I have taken the power supply out of a computer... Power supply model number.. IBP-38A Does anyone know how to start it... The computer's on / off switch was / is on the front panel and the connecting wire goes to the mother board... I still have the mother board and have considered doing a board trace to track the wire to the power supply.... However to save me some time would anyone know were the start circuit is?.. Larry ve3fxq The following link will show you how to get an ATX style power supply to start but keep in mind that without a proper load, as in a motherboard or a power supply tester with built in dummy load what you see with meter is not necesarily valid. You may see voltages exactly to specs with no load but plug it into something and then the voltages can vary widely depending on what may be wrong with the power supply. http://www.duxcw.com/faq/ps/ps4.htm |
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computer power supply..
larya wrote:
Greetings... I have taken the power supply out of a computer... Power supply model number.. IBP-38A Does anyone know how to start it... The computer's on / off switch was / is on the front panel and the connecting wire goes to the mother board... I still have the mother board and have considered doing a board trace to track the wire to the power supply.... However to save me some time would anyone know were the start circuit is?.. Larry ve3fxq The front switch doesn't feed the power supply directly. The signal is conditioned by motherboard logic. One of the necessary functions carried out by the logic, is a four second delay before shutting off the computer (to prevent accidents). The four second delay is context sensitive as well, so the conditioning of the front switch contact closure, depends on whether you're in the BIOS or the OS etc. X-------------- Motherboard ------ PS_ON# --------- ATX PSU Logic Front Chip Switch (Momentary) (latches signal) The PS_ON# signal controls the soft switching of an ATX power supply. That is a logic signal on the main cable. The "#" in the signal name, means the signal is active low. You ground the PS_ON# signal, to turn on the supply. "Conor" and "GlowingBlueMist" have already suggested connecting PS_ON# to an adjacent COM (ground) pin, to turn on the supply and make the fan spin. The 20 and 24 pin power connectors have similar pinout. The 24 pin connector is just a 20 pin, with four redundant pins added to the end of it. You can see how a 20 pin, is a subset of a 24 pin, here. http://www.playtool.com/pages/psuconnectors/20in24.jpg There are pinout tables available in the article as well, so you can compare a 24 pin to a 20 pin. http://www.playtool.com/pages/psucon...onnectors.html Paul |
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computer power supply..
larya wrote:
Greetings... I have taken the power supply out of a computer... Power supply model number.. IBP-38A Does anyone know how to start it... The computer's on / off switch was / is on the front panel and the connecting wire goes to the mother board... I still have the mother board and have considered doing a board trace to track the wire to the power supply.... However to save me some time would anyone know were the start circuit is?.. Larry ve3fxq green wire to ground |
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computer power supply..
On Apr 23, 9:28 am, larya wrote:
Greetings... I have taken the power supply out of a computer... Power supply model number.. IBP-38A Does anyone know how to start it... The computer's on / off switch was / is on the front panel and the connecting wire goes to the mother board... I still have the mother board and have considered doing a board trace to track the wire to the power supply.... However to save me some time would anyone know were the start circuit is?.. Larry ve3fxq MB and tracking power traces? Good luck with a razor and microscope, traces are epoxied within six layers down into MBs. Power supplies work off a PWR-GOOD strobe. Combination of RESET and PWR-ON - two two-way connectors on the MB jumper for the case setup. You can also "start" a fuel injector with the right voltage and bench/ test setup, although not much point unless there's a known condition, localized and within means of disassembly or cleaning. What saves lots of time is simply having a PS in reserve. Open the case, balance the new PS conveniently where there's no sparks, and plug it in ontop the old one. Amazing what an excellent quality PS does not reveal, placed beside all kinds of problems being produced by a crap PS headed south. |
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