Further to my last post I have purchased a power supply tester but still have the same problem , how do you trigger the PSU to start up , as they only seem to respond to a signal from the motherboard . I have even tried known working PSU's and they wont start till you press the power on button on the motherboard.
Thanks for your reply , only one of the PSU's I want to test has an on off switch and even that doesn't start when plugged into the mains .I feel certain it needs some sort of signal to start up , similar to an extractor fan in a bathroom.The tester obviously doesn't provide this .
Thanks again for your reply , I would agree with you except that I have tried it with PSU's that are known to be working . I am trying to sort out the good from the bad of several PSU's I have accumulated over the years , and dont want to risk connecting a faulty one to a motherboard and blowing it.
I am using the 20 pin option which it says in the instructions should work . Not sure which 4 or 8 pin cable you mean . Have tried connecting a HDD to give it a bit of load but no joy even with a known working PSU . Incidentally , do you know if there is a temporary start current in excess of the normal running current ? i.e. a brief surge .
On recent motherboards there's a 4 or 8 pin connector to supply additional power to the CPU. If you have a 20 pin connector it probably means that it's an old motherboard and power supply that didn't require one. However if I start up a PSU connected to the Tester without the 8 pin cable connected then it beeps and gives an error message.
There's no sign of a surge when initially switched on.
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