why do my power supplies die

vanniko63 · Oct 31, 2015

i am trying to build ,new pc. i have a good game pc which i was planning to take parts and use on my new build .manly the power supply and ram and perhaps other minor .so i took my ax1200 corsair out and put it in new case . select test button . no light .connected molex pin to fan nothing .so i am returning .the unit is july of 2014 ,
i got a evga 750 for the old pc , dead after install , returned , i got a sently 750 , it worked for a day . today dead .a month ago i got a corsair used 750 hx dead returned . first i thought just bad luck .getting used .now switched to new i have to settle for cheap since all the return cost are adding up .
i can,t figure it out . i believe in my mind i just have bad power since home is old . i do have a new surge protector which all outlets are being used .i am buying a power supply tester , to have .waiting . i have tested out put from surge protector reads 117 volts bit of fluctuation.116 to 117 . do have old wires .non nomex.type . had this run last year also .anything i can do to protect , or prevent , i am puzzled i don't believe it is bad luck anymore .
have room full of pc parts and can not do anything .what is steady is my gateway which has a thermaltake 500w .stock . running for 4 years ,leave it on most time . if some one else has some experience or knowledge to advise greatly appreciated .

westom · Nov 1, 2015

vanniko63 :

How do you know each is dead? Normal is for a good supply to sometimes not work in what is otherwise a perfectly good computer? Just because it does not power on does not mean it is defective. How do you know other parts of that computer's power 'system' are good? PSU is only one part of that power 'system'.

If a power supply failed, then what internal part has failed. Or, at minimum, numbers identify which colored wires are connected to that defect. That means a meter, some requested instructions, and minutes of labor. Those three digit numbers make possible an informed reply from the fewer who really know this stuff. Only those numbers can say, without speculation, that a PSU actually failed.

Currently provided is subjective observations that can result in answers of wild speculation. Replies will only be as useful as facts you first provide. That means numbers AND why you know each supply has failed.

A power supply tester is as expensive as a meter. It cannot say a supply is good. It can only identify some defective supplies. A power supply tester cannot provide numbers that make possible informed recommendations.

AC mains: voltage can drop so low than incandescent bulbs dim to 40% intensity. Even a voltage that low is perfectly good (not harmful) for any computer PSU. How often are your lights dimming that much? Why then do you know old wiring causes damage?

Any wiring that meets code - from the 1930s or 2010s - is perfectly good for a computer. Defective wiring does not harm hardware. Defective wiring means things stop working OR (and this is most important) human life is at risk. Never assume age results in failure. If house wiring causes hardware damage, then one can also say why. Otherwise that is another classic example of junk science reasoning.

Provided is how to get useful answers. Provided is also a useful tool to identify house wiring problems - an incandescent bulb.

vanniko63 · Nov 2, 2015

happy to get your response , and i do see and understand your view , yes how did i come to conclusion . i have 3 pc,s this moment .gateway for work school .off shelf bought , game pc , and a new pc, which i started building , i am taking parts from my game pc to put into new build . the power supply , is one of those parts ax1200i rather good powersupply .working fine , no issues , untill i put into new build . then no power on test ,has self test with led , nothing . within seconds good to bad . nothing connected , just simply test before proceeding . no power from molex .tried to connect to fan ,and water pump .ans sata connecter to lights .nothing .
old game pc . bought a used corsair hx 750, i believe , put in nothing . returned assumed bad since used . bought new sently 750w , got power , after few cycles nothing after 2 days trying . nothing . so i did purchase a power supply tester lk-40310 ,from amazon ,waited while new replacement came in , tested . and after 3rd day it power up .surprised yes .read good, molex did not read 12v but did read 5 v ,so i am scratching my head .was why it started to work .but in the interim the new supply came in .so i put tester on new .and tester went blue , could not read anything .just showed 0 and L,s like it was trying to indicate .did the tester go bad ? but i have placed in old game pc . and it is providing power , but my mother board is not working . so i believe i have new issue .now , but i am going to place power supply onto new build to test mobo and case ,
in past i have had issues were my light in room .went out , i went to switch tryed switching on off nothing . next day while sitting the light went on .by itself .worked but now for past 8 months nothing i keep it off just in case .have had other issues in past , i cant figure it out .and i am also a electrician in training .electrician in navy ,and have a degree in mech engineering . i do know from my military days that corrosion and high resistance can and does strange things .i am looking for solution , i have purchased new surge protector which i am waiting for .just strange to go thru 4 power supplies with in 2 days and one within seconds . only one that continues to work , is the gateway which is on the most and also the oldest .all these module high power , are not doing it for me . or is it all just bad luck .

westom · Nov 3, 2015

vanniko63 :

Tester says nothing useful. Post is even more difficult to follow due run on sentences that say different things depending on where punctuation might belong.

Tester only created confusion. Swappng parts increases that confusion. That post does not have three digit numbers for each measurement. Even what was done before each measurement is subject to interpretation. No useful facts are provided. No numbers. Nothing useful is possible from that post. All that swapping parts has only increased confusion.

Second paragraph bluntly says what must be done to obtain a useful answer. Without those three digit numbers, then a useful answer is not possible.

vanniko63 · Nov 3, 2015

the new power supply is in new pc. and so far it is working . and tester is also functioning . i get no beeps , which is how it should be when running proper , so far so good .power supply no 4 .

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