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help, please, with Compaq Presario power supply problem
Hi. I'm helping someone with a Compaq Presario 5320US desktop that
won't power on at all. The problem occured when the PC was moved from one room to another. A previous tech told the owner to just go buy a standard 350 watt power supply (which she did) and that he'd then install it. This happened, apparently, without the tech even bothering to do any actual troubleshooting -- plus, he was also apparently ignorant of the fact that this Presario uses a non-standard proprietary power supply. The owner can't get ahold of that guy now. So, the owner says to me: can you fix it? I can't even plug in the replacement standard power supply because the motherboard has a 24-pin connector instead of the standard 20-pin. Similarly, I can't use my quick-and-easy power supply tester because the old power supply won't plug into that. I'd go ahead and start probing with a DMM for proper voltages, but I'm under the impression that I'll get nowhere with that if the power supply isn't already on and under load. Finally, without a known good power supply, I can't even tell whether the power supply was actually the problem, or whether it was instead something else. Any suggestions as to how to proceed? I did come across a web site that sells 24-pin to 20-pin adapters, but does anyone know whether such adapters even have a standard wiring pattern? Since the Compaq supply is non-standard, how would I know whether the adapter would be wired properly for it? I found that the customer can buy an exact replacement part from the HP/Compaq web site for $150, but doing so seems silly before we even know where the problem lies. Any help appreciated! Jacques |
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"Jacques Clouseau" wrote in message t... Hi. I'm helping someone with a Compaq Presario 5320US desktop that won't power on at all. The problem occured when the PC was moved from one room to another. A previous tech told the owner to just go buy a standard 350 watt power supply (which she did) and that he'd then install it. This happened, apparently, without the tech even bothering to do any actual troubleshooting -- plus, he was also apparently ignorant of the fact that this Presario uses a non-standard proprietary power supply. The owner can't get ahold of that guy now. So, the owner says to me: can you fix it? I can't even plug in the replacement standard power supply because the motherboard has a 24-pin connector instead of the standard 20-pin. Similarly, I can't use my quick-and-easy power supply tester because the old power supply won't plug into that. I'd go ahead and start probing with a DMM for proper voltages, but I'm under the impression that I'll get nowhere with that if the power supply isn't already on and under load. Finally, without a known good power supply, I can't even tell whether the power supply was actually the problem, or whether it was instead something else. Any suggestions as to how to proceed? I did come across a web site that sells 24-pin to 20-pin adapters, but does anyone know whether such adapters even have a standard wiring pattern? Since the Compaq supply is non-standard, how would I know whether the adapter would be wired properly for it? I found that the customer can buy an exact replacement part from the HP/Compaq web site for $150, but doing so seems silly before we even know where the problem lies. If no power at all it could be the power switch. Check that with your ohm meter. If that's ok, check for power on any of the power supply molex connectors. If no power there, it's the PS. You could use and ATX PS and rewire the compaq connectors with a little help from google or just move everything except the MB over to a new case/PS for $100. Have you checked the line cord? |
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Jacques Clouseau wrote:
Hi. I'm helping someone with a Compaq Presario 5320US desktop that won't power on at all. The problem occured when the PC was moved from one room to another. A previous tech told the owner to just go buy a standard 350 watt power supply (which she did) and that he'd then install it. This happened, apparently, without the tech even bothering to do any actual troubleshooting -- plus, he was also apparently ignorant of the fact that this Presario uses a non-standard proprietary power supply. The owner can't get ahold of that guy now. So, the owner says to me: can you fix it? I can't even plug in the replacement standard power supply because the motherboard has a 24-pin connector instead of the standard 20-pin. Similarly, I can't use my quick-and-easy power supply tester because the old power supply won't plug into that. I'd go ahead and start probing with a DMM for proper voltages, but I'm under the impression that I'll get nowhere with that if the power supply isn't already on and under load. Finally, without a known good power supply, I can't even tell whether the power supply was actually the problem, or whether it was instead something else. Any suggestions as to how to proceed? I did come across a web site that sells 24-pin to 20-pin adapters, but does anyone know whether such adapters even have a standard wiring pattern? Since the Compaq supply is non-standard, how would I know whether the adapter would be wired properly for it? I found that the customer can buy an exact replacement part from the HP/Compaq web site for $150, but doing so seems silly before we even know where the problem lies. Any help appreciated! Jacques Is there an on/off switch on the back of the power supply? Is the 110V/220V switch on the back of the power supply in the proper postion? |
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#5
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I can tell you from experience that the power supply is so proprietary that
the 24 pin connectors won't work,and it's very doubtful that you could rewire a standard unit to work.Replacements can be had for much less than Compaq's going price at various parts sites,if you look around. "Jacques Clouseau" wrote in message t... Hi. I'm helping someone with a Compaq Presario 5320US desktop that won't power on at all. The problem occured when the PC was moved from one room to another. A previous tech told the owner to just go buy a standard 350 watt power supply (which she did) and that he'd then install it. This happened, apparently, without the tech even bothering to do any actual troubleshooting -- plus, he was also apparently ignorant of the fact that this Presario uses a non-standard proprietary power supply. The owner can't get ahold of that guy now. So, the owner says to me: can you fix it? I can't even plug in the replacement standard power supply because the motherboard has a 24-pin connector instead of the standard 20-pin. Similarly, I can't use my quick-and-easy power supply tester because the old power supply won't plug into that. I'd go ahead and start probing with a DMM for proper voltages, but I'm under the impression that I'll get nowhere with that if the power supply isn't already on and under load. Finally, without a known good power supply, I can't even tell whether the power supply was actually the problem, or whether it was instead something else. Any suggestions as to how to proceed? I did come across a web site that sells 24-pin to 20-pin adapters, but does anyone know whether such adapters even have a standard wiring pattern? Since the Compaq supply is non-standard, how would I know whether the adapter would be wired properly for it? I found that the customer can buy an exact replacement part from the HP/Compaq web site for $150, but doing so seems silly before we even know where the problem lies. Any help appreciated! Jacques |
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#7
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I would suggest that you start by disconnecting everything, including
the mobo from the supply. Then hook up just one hard drive and check the 5 and 12 volt lines at the ends of a drive power connector. Other voltages can be checked by following the below code; most people followed the standard color codes, even if the supplies were non standard; 3.3V=Orange, 5V=Red, 12V=Yellow, -12V=Blue, -5V=White(may not be present) Common=Black, 5Vstandby=Purple. PSOn is usually Green. PwrOK=Gray You will have to ground the on to common, green to Black, to turn it on. If it passes this test then hook up just the mobo, with no cards or memory and recheck Keep adding things ONE at a time until it fails. "Jacques Clouseau" wrote in message t... In article , says... I can tell you from experience that the power supply is so proprietary that the 24 pin connectors won't work,and it's very doubtful that you could rewire a standard unit to work.Replacements can be had for much less than Compaq's going price at various parts sites,if you look around. "Jacques Clouseau" wrote in message t... Thank you for the information -- that's exactly what I needed to know. Now I just need a way to diagnose whether the problem's the power supply or something else. Thanks, Jacques |
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