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PC power suplies
Hi I have a tower unit with a 500W PSU that I think is failing. After a wile the PC crashes and I get a blue screen. This happens after it has been on for a while. On one occasion it went dead completely but it started up when I got to it.
I don't think it can be anything else. Not sure if an over heating CPU would cause the power to go off. If it is that can I replace it with a bigger PSU 700W or 900W? is the size and foot print the same on these? I was looking at a UK site ebuyer and saw this. Corsair CSM 650W Semi Modular 80+ Gold Power Supply £69.98inc. vat |
#2
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PC power suplies
Desmond wrote:
Hi I have a tower unit with a 500W PSU that I think is failing. After a wile the PC crashes and I get a blue screen. This happens after it has been on for a while. On one occasion it went dead completely but it started up when I got to it. I don't think it can be anything else. Not sure if an over heating CPU would cause the power to go off. If it is that can I replace it with a bigger PSU 700W or 900W? is the size and foot print the same on these? I was looking at a UK site ebuyer and saw this. Corsair CSM 650W Semi Modular 80+ Gold Power Supply £69.98inc. vat An overheating CPU can turn off the power. That feature is called THERMTRIP, and exists on modern Intel and AMD processors. An overheating PSU can turn off the power as well. A thermistor on one of the heatsinks inside the PSU, keeps track of whether the PSU is properly cooled at the moment. A PSU even has a mains fuse inside it, but that hardly ever blows open circuit. A PSU can have weak output, to cause the computer to crash. I have a PSU in my junk room here, which can only provide 100mA on the 12V rail, before the voltage level starts to drop to a low level. And the PSU continues to run, and does not shut off (because it's and old PSU, and has few forms of protection). A computer can crash, if the CPU overheats, but that's more likely to happen on systems without THERMTRIP and throttling as forms of protection. You can replace the PSU if you like, with no guarantee that's the only problem. You can measure CPU temperature with various utilities. Speedfan (almico.com) or Asus Probe perhaps. If I suspect a power supply problem, I use a multimeter for some voltage readings. And see if the voltage is stable or not. I also use a clamp-on DC ammeter, in case I suspect there is a partial short in the motherboard. Clamp-on DC ammeters aren't all that cheap. But a regular multimeter (for voltage readings) is only $20. Even without a lot of instrumentation, you can feel the exhaust air temperature on the PSU, to get some indication of how much load might be present. On some PSUs that failed here, I got some initial warning, by noting a "wobble" in the fan speed. The fan speed goes up and down a little bit, unlike how the PSU used to work when it was new (fan speed was very stable). So you can also make those kinds of observations if you like (if you cannot afford a lot of fancy instruments). Paul |
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PC power suplies
Desmond paulotuatail aol.com wrote:
Hi I have a tower unit with a 500W PSU that I think is failing. After a wile the PC crashes and I get a blue screen. This happens after it has been on for a while. On one occasion it went dead completely but it started up when I got to it. I don't think it can be anything else. Not sure if an over heating CPU would cause the power to go off. You can measure both while within Windows.... |
#4
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PC power suplies
On Wed, 9 Apr 2014 12:50:39 -0700 (PDT), Desmond
wrote: Hi I have a tower unit with a 500W PSU that I think is failing. After a wile the PC crashes and I get a blue screen. This happens after it has been on for a while. On one occasion it went dead completely but it started up when I got to it. I don't think it can be anything else. Not sure if an over heating CPU would cause the power to go off. If it is that can I replace it with a bigger PSU 700W or 900W? is the size and foot print the same on these? I was looking at a UK site ebuyer and saw this. Corsair CSM 650W Semi Modular 80+ Gold Power Supply £69.98inc. vat Before buying anything I would look at the cooling fan on the CPU. A common cause of machines suddenly shutting off after they have been operating for a while is some thermal sensor tripping. I have never had a failing power supply that caused problems only after the machine had been running for a while although I could imagine that happening when you play a game and the graphics card draw shoots up. Other than that an iffy power supply will usually trip during the startup surge. If the voltage goes out of spec the machine will instantly shut down--it's much better to crash the machine than to have it act erratically. (This is why in the old days you were supposed to take the floppy disks out of a machine before shutting it down. The electronics didn't have a failsafe back then, the drive could execute bogus commands as the power died. If the drive were spinning when that happened and the command was a write.... |
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