 Posted: Sun May 10, 2009 10:03 am Post subject: |
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| My suggestion is to take out the SMPS from the computer, try to start it while loading it with a load of a 12V25W bulb (car headlight lamp) and see whether not it works. If the bulb is lighted up and the different dc output voltages are correct, then maybe you had a bad motherboard or a bad microprocessor. | |
| Posted: Fri May 08, 2009 6:26 am Post subject: Computer power supply problem |
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| Dear sir, I have a Intel PC - 945GZDMS-6H board. its have a power supply problem, some time when i am trying press the power button to start my PC, power LED flashing one time and quickly disconnected the supply. when i tryed the same 5-6 times, then PC will be start by luck. I cant understand, what the problem OR problem in SMPS of my Motherboard. Pl suggest the solution about same. Thanks. |
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| Posted: Thu Jul 10, 2008 5:26 pm Post subject: |
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| try finding out if thers a shunt regulator "TL431" its a 3 pin IC, replace this, it worked for me:) try to check also the zeners feeding the power transistors, it also worked for me on my other dead smp, now both are working fine tnx | |
| Posted: Thu Jul 10, 2008 8:33 am Post subject: SMPS no power |
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| Currently, I am repairing SMPS(>1kW, 48VDC and 25A). I could not able to solve no power problem. I check almost every single components with a huntron tracker, of course, some certain component like mosfet driver IR2110, it would not able to check. Do you think it is the problem ? or something else. Pls help Thanks |
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| Posted: Tue Jul 05, 2005 11:11 am Post subject: |
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Hmm, I'll gues I mixed up the autocoupler and controller IC, my english isn't a 100 %, sorry  The autocoupler is used to "measure" if there is any secundairy power. These thing rairly fail. So no need to replace them. The controller IC can breakdown!, so I meant to replace that one (cause it's usualy cheap) Grtz Mark |
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| Posted: Tue Jul 05, 2005 5:28 am Post subject: |
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| thanks. but what about the autocoupler . what is it's function. how can i know if it is faulty. what can be the effects when it is faulty. tedy |
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| Posted: Fri Jul 01, 2005 8:43 pm Post subject: SMPS power supply problem, help |
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| http://weber.ucg.ie/mirrors/www.repairfaq.org/sam/smpsfaq.htm#smpstsps | |
| Posted: Fri Jul 01, 2005 2:09 pm Post subject: |
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| thanks. but what about the autocoupler . what is it's function. how can i know if it is faulty. what can be the effects when it is faulty. tedy |
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| Posted: Thu Jun 30, 2005 4:46 am Post subject: |
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If you've already replaced the capacitors (better spelling as "capacitators"  ) and the power supply still isn't starting up, it surely is possible that the controller IC has died. They are often very cheap, so I would suggest just to replace it and you will know if it's failing! Grtz Mark P.s. Also check the resistors that "feed" the control IC, from the 300 V capacitor to the IC. They are most of the times a few 100 KOhms, so you will have to remove them from the circuit to measure their value. |
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| Posted: Wed Jun 29, 2005 6:05 pm Post subject: |
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| What about the autocoupler ( Pc......), the controller IC, Can they stop the power going to the seconday side. tedy |
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