Power Supply Problem
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Posted by Edward W. Thompson on December 26, 2007, 2:09 am
Please log in for more thread options the 'on' button causes the front lights to momentarily come on then extinguish and the power supply does not start. It gives the impression that the 'relay' is not holding in (I know there isn't a mechanical relay but I hope you get the idea). Generally trying a secend time starts the machine but today it required four attempts. The power supply is (I think) an Antec as it came preinstalled in the Antec Sonata case. Is this indicative of a failing power supply? Other than the starting problem there are no other indications of a problem. | ||||||||||||||||
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Posted by kony on December 26, 2007, 3:39 am
Please log in for more thread options Sometimes, a motherboard or other connected part failure will cause a very high load on the PSU and that results in it being inable to handle the (nearly shorted) load and shut off. More often, it is a sign the power supply has failed. Using a multimeter to monitor voltages might help, sometimes it can indicate an out of spec condition but not always in this situation. >
>The power supply is (I think) an Antec as it came preinstalled in the >Antec Sonata case. Is this indicative of a failing power supply? >Other than the starting problem there are no other indications of a >problem. I would suspect the PSU capacitor(s) have failed. After leaving the PSU unplugged for several minutes you might inspect it, particularly the larger capacitors around the point where the exiting wiring harness is soldered to the board. A bit more specifics might help like the history of the system, how long it had ran with this PSU, more details on which Antec PSU it is, and a concise list of the major parts in the system. In some cases it might be a problem if you had added an addt'l load on the 5VSB circuit, if the motherboard were jumpered (or always uses) 5VSB rail for powering PS2 or USB peripherals and you had added something. In that case unplugging these parts might lessen the load on 5VSB and the system would then more regularly POST and boot. | ||||||||||||||||
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Posted by Edward W. Thompson on December 27, 2007, 2:51 am
Please log in for more thread options
>On Wed, 26 Dec 2007 07:09:03 +0000, Edward W. Thompson
> >>I am experiencing problems in starting my machine. Recently pressing
>>the 'on' button causes the front lights to momentarily come on then >>extinguish and the power supply does not start. It gives the >>impression that the 'relay' is not holding in (I know there isn't a >>mechanical relay but I hope you get the idea). Generally trying a >>secend time starts the machine but today it required four attempts. >
>Sometimes, a motherboard or other connected part failure >will cause a very high load on the PSU and that results in >it being inable to handle the (nearly shorted) load and shut >off. > >More often, it is a sign the power supply has failed. > >Using a multimeter to monitor voltages might help, sometimes >it can indicate an out of spec condition but not always in >this situation. > > >>
>>The power supply is (I think) an Antec as it came preinstalled in the >>Antec Sonata case. Is this indicative of a failing power supply? >>Other than the starting problem there are no other indications of a >>problem. >
>I would suspect the PSU capacitor(s) have failed. After >leaving the PSU unplugged for several minutes you might >inspect it, particularly the larger capacitors around the >point where the exiting wiring harness is soldered to the >board. > >A bit more specifics might help like the history of the >system, how long it had ran with this PSU, more details on >which Antec PSU it is, and a concise list of the major parts >in the system. > >In some cases it might be a problem if you had added an >addt'l load on the 5VSB circuit, if the motherboard were >jumpered (or always uses) 5VSB rail for powering PS2 or USB >peripherals and you had added something. In that case >unplugging these parts might lessen the load on 5VSB and the >system would then more regularly POST and boot. Thanks for your thougts. The PSU is now about 4 years old and I have not added any additional loads to the system, at least not for the past 3/4 months when I installed a new AGP video card that required a discrete power supply. The problem I have is not consistent,that is the start up problem does not occur every day but happens sufficiently often to start ringing 'alarm bells', hence my enquiry. I would have thought component failure would mean th 'fault' would be consistent but perhaps not. I suppose the only course is to let it continue and no doubt eventually one day it simply won't start and a replacement PSU will be the 'fix'. I guess the PSU is not really a serviceable items, at least not for the ' electronic challenged' among us :-). | ||||||||||||||||
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Posted by kony on December 27, 2007, 1:56 pm
Please log in for more thread options On Thu, 27 Dec 2007 07:51:44 +0000, Edward W. Thompson
>Thanks for your thougts. The PSU is now about 4 years old and I have
>not added any additional loads to the system, at least not for the >past 3/4 months when I installed a new AGP video card that required a >discrete power supply. The problem I have is not consistent,that is >the start up problem does not occur every day but happens sufficiently >often to start ringing 'alarm bells', hence my enquiry. > > I would have thought component failure would mean th 'fault' would be >consistent but perhaps not. I suppose the only course is to let it >continue and no doubt eventually one day it simply won't start and a >replacement PSU will be the 'fix'. I guess the PSU is not really a >serviceable items, at least not for the ' electronic challenged' among >us :-). The PSU would be the first suspect, but failure of other parts could also cause the problem. Thus an inspection of the PSU and taking voltage measurements might help though with some gradual PSU failures the voltages don't look too far off. If no clear fault can be found I would then try another PSU first, but also inspecting the larger capacitors on the motherboard, particularly around the CPU socket. | ||||||||||||||||
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>the 'on' button causes the front lights to momentarily come on then
>extinguish and the power supply does not start. It gives the
>impression that the 'relay' is not holding in (I know there isn't a
>mechanical relay but I hope you get the idea). Generally trying a
>secend time starts the machine but today it required four attempts.