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#1
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Emaching bad power suppy
I have a friends PC at my house to check out. It would not boot, no
activity, (Power supply fan not turning) no post no nothing. I had a 235 watt power supply laying around and replaced the 250 watt that was in the PC. The 235 I put in powers up but still no post, no beeps, no nothing. Is it possible that the 235 is not enough watts? I also disconnected the 2 cd drives and just left the HD and floppy connected, still no post or beeps. Thanks, Brian |
#2
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Both learn how the power supply 'system' works AND identify
the failed part before swapping anything. Previously posted are "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q and "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa Takes a long time to read. Procedure can determine the problem in but minutes. Notice the 'system' has handshaking between PSU and controller. The 'system' is composed of three components. Brian Cloutier wrote: I have a friends PC at my house to check out. It would not boot, no activity, (Power supply fan not turning) no post no nothing. I had a 235 watt power supply laying around and replaced the 250 watt that was in the PC. The 235 I put in powers up but still no post, no beeps, no nothing. Is it possible that the 235 is not enough watts? I also disconnected the 2 cd drives and just left the HD and floppy connected, still no post or beeps. Thanks, Brian |
#3
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There is a red light on the motherboard that is on and the power supply fan
as well as the CPU fan. That is all that will work. I hooked up an extra hard drive to one of the connecters and it spun up fine. Took out video card to try a get some beeps still nothing. Is it worth it to try another PS? May a 350? Thanks Brian "w_tom" wrote in message ... Both learn how the power supply 'system' works AND identify the failed part before swapping anything. Previously posted are "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q and "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa Takes a long time to read. Procedure can determine the problem in but minutes. Notice the 'system' has handshaking between PSU and controller. The 'system' is composed of three components. Brian Cloutier wrote: I have a friends PC at my house to check out. It would not boot, no activity, (Power supply fan not turning) no post no nothing. I had a 235 watt power supply laying around and replaced the 250 watt that was in the PC. The 235 I put in powers up but still no post, no beeps, no nothing. Is it possible that the 235 is not enough watts? I also disconnected the 2 cd drives and just left the HD and floppy connected, still no post or beeps. Thanks, Brian |
#4
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I was walking down the street, minding my own business, when on Sun,
9 Jan 2005 11:52:40 -0600, "Brian Cloutier" screamed from behind the mulberry bush: I have a friends PC at my house to check out. It would not boot, no activity, (Power supply fan not turning) no post no nothing. I had a 235 watt power supply laying around and replaced the 250 watt that was in the PC. The 235 I put in powers up but still no post, no beeps, no nothing. Is it possible that the 235 is not enough watts? I also disconnected the 2 cd drives and just left the HD and floppy connected, still no post or beeps. It's more likely the cheap ass mobo in the E-machine was fried by the PS as it died. Time to get a new machine, not worth fixing. |
#5
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Brian Cloutier wrote:
I have a friends PC at my house to check out. It would not boot, no activity, (Power supply fan not turning) no post no nothing. I had a 235 watt power supply laying around and replaced the 250 watt that was in the PC. The 235 I put in powers up but still no post, no beeps, no nothing. Is it possible that the 235 is not enough watts? I also disconnected the 2 cd drives and just left the HD and floppy connected, still no post or beeps. Maybe the first PSU fried because the mobo became bad (capacitors leaked or bulged -- see www.motherboardrepair.com) or shorted against the case. PSUs in major brand computers are normally really high quality and can't be damaged by the mobo, but eMachines seems to be an exception and sometimes uses even Powmax PSUs, which are among the worst. If the HD spun up, it probably means that the +12V and +5.0V rails are OK, so that leaves the +3.3V rail in question, but I have a feeling that it's OK, too, although I had a cheapo PSU where only it failed (when a memory module plugged in backwards). A voltage meter will tell you for sure, and even the cheapest digital one (not analog) is very accurate. That 235W PSU is probably powerful enough, at least for testing the mobo without any CD or hard drives connected, unless it's a realy bad brand. What brand is it, anyway? |
#6
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The 235 watt is an a-open. The original PS did not fire up at all. At
least the 235 spins the fans. However it did not power up the cd drives or the floppy. I am begining to wonder if the original PS took out more than the MB? Brian That 235W PSU is probably powerful enough, at least for testing the mobo without any CD or hard drives connected, unless it's a realy bad brand. What brand is it, anyway? |
#7
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Brian Cloutier wrote: The 235 watt is an a-open. The original PS did not fire up at all. At least the 235 spins the fans. However it did not power up the cd drives or the floppy. I am begining to wonder if the original PS took out more than the MB? A-open is really, really good and probably more powerful than your 250W or even some 300W PSUs. I don't understand how the HD could run but the floppy and CD drives wouldn't because they all operate off the same +12V and +5V rails. Do the CD drive trays open when you press their buttons? I think that the MB took out the original PS rather than the other way around. You'll have to measure the voltages for the CPU core, memory slots, PCI slots, etc., to see what's still working. |
#8
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The cd drives both work as well as th HD's. There is no speaker on this
cheap ass machine so that is why I get no beeps. The red light on the MB still lights up so does that mean anything? Thanks, Brian "larry moe 'n curly" wrote in message ups.com... Brian Cloutier wrote: The 235 watt is an a-open. The original PS did not fire up at all. At least the 235 spins the fans. However it did not power up the cd drives or the floppy. I am begining to wonder if the original PS took out more than the MB? A-open is really, really good and probably more powerful than your 250W or even some 300W PSUs. I don't understand how the HD could run but the floppy and CD drives wouldn't because they all operate off the same +12V and +5V rails. Do the CD drive trays open when you press their buttons? I think that the MB took out the original PS rather than the other way around. You'll have to measure the voltages for the CPU core, memory slots, PCI slots, etc., to see what's still working. |
#9
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Every device required voltages in limits. But how far
outside of those limits does the peripheral device still function? In this case, the HD may work at voltages too low but CD and floppy would not. Moreso, the LED will always work when voltages are too low. BTW, this is an example of ternary logic. You are trying to use binary logic to solve the problem. Will not work. Again we are back to the same problem. Wild speculation because we do not have numbers. You have a procedure up top that could have answered these questions in less time than it took to post. If you really want to fix the problem AND come out smarter, then get the meter and follow those simplistic procedures. "I think that the MB took out the original PS" is wrong. Basic knowledge: Intel even defines the size of the wire that must short out all power supply outputs ... and still a power supply must not be damaged. This was defacto standard for power supplies even 30 years ago. A motherboard can only damage a power supply that was defective when purchased (IOW bought by a bean counter mentality). Yes there are power supplies that can be damaged by the motherboard only because Asian manufacturers have discovered a large number of bean counters pretending to be computer experts. Such supplies sell at prices such as $25 and $40. But it is not the motherboard that damages. Damage due to a bean counting human. That type of failure is more often a complete burn out - not your symptoms. Get the meter and get those necessary numbers. Determine power supply integrity in but a minute. End all these silly speculations by having numbers. Brian Cloutier wrote: The cd drives both work as well as th HD's. There is no speaker on this cheap ass machine so that is why I get no beeps. The red light on the MB still lights up so does that mean anything? |
#10
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Brian Cloutier wrote: I think that the MB took out the original PS rather than the other way around. You'll have to measure the voltages for the CPU core, memory slots, PCI slots, etc., to see what's still working. The cd drives both work as well as the HD's. There is no speaker on this cheap ass machine so that is why I get no beeps. The red light on the MB still lights up so does that mean anything? The red light could be the indicator that the mobo is getting +5V power from the purple standby wire, which is supposed to be live whenever the PSU is receiving AC from the wall outlet. |
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