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PSU Loud Pop

Discussion in 'Power Supplies' started by chroniclard, Dec 5, 2018.

  1. chroniclard

    Sgarrista

    Joined: Apr 23, 2014

    Posts: 9,279

    Just built up another rig and when I turned the PSU switch on there was a loud pop, immediately turned it off then tried it again. The fans still spin up and the motherboard led's all light up. (Doesnt actually produce a display or boot yet, that may be a separate issue).

    Could a loud pop be anything but bad?
     
  2. Distracted

    Wise Guy

    Joined: Aug 30, 2018

    Posts: 1,191

    I've heard of it happening on corsair psus and i think jonnyguru called it in rush current filling a depleted cap.

    https://linustechtips.com/main/topic/890449-rm650x-makes-a-popping-noise/
     
  3. chroniclard

    Sgarrista

    Joined: Apr 23, 2014

    Posts: 9,279

    Funnily enough it is a Corsair. Will have a bit more of a google, thanks. :)
     
  4. Distracted

    Wise Guy

    Joined: Aug 30, 2018

    Posts: 1,191

    There are a few others that reported having it with their units on here. I think some PSUs died or were on their way out, so despite what has been said by Jonnyguru you may want to proceed with caution. Perhaps return for a replacement if it is still new enough.

    I'm not saying it will die, but what reports i have read about the popping seem to end with RMA. Of course someone like Jonnyguru would know much better than I.
     
  5. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,481

    Location: Finland

    Current doesn't make sound when it has proper conductive path.
    There could be sharp sound only if there's some broken solder joint etc with gap causing electric arcing.
     
  6. Dave Burton

    Associate

    Joined: May 8, 2018

    Posts: 32

    I'm an electrician and electronics engineer, not sure where you got that info from but it's wrong. Anything that takes a lot of current to get going can make a noise, even if everything is ok. Loud bangs are not so good, but even switching on a PSU can result in arcing of the switch contact.

    DB
     
  7. Radox-0

    Wise Guy

    Joined: Mar 9, 2015

    Posts: 2,268

    Location: Earth

    Yeah I get a loud popping about 50% of the time and have done so for a year or two with a corsair unit (not RMx) when turning off from the wall (pc off but can see there being standby power) and seeing a spark illuminating the wall. It’s disconcerting to say the least, but for better or worse become used to it.
     
  8. maklabouhlel

    Hitman

    Joined: Nov 26, 2009

    Posts: 894

    My HX620 sparks when I hit the psu switch. I've stopped using it thinking it's on its way out. Would it be safe?
     
  9. chroniclard

    Sgarrista

    Joined: Apr 23, 2014

    Posts: 9,279

    It should not be popping/banging and/or sparking at all. That said the PC appeared to work fine when it was on......

    Not sure if its safe or not but I dont like it so have started the RMA process. Using an old spare 750w for now which doesnt bang when you turn it on. :p
     
  10. Dave Burton

    Associate

    Joined: May 8, 2018

    Posts: 32

    The problem is that every time it "sparks", a layer of carbonisation appears and this become resistive over time eventually leading to the failure of the switch. I have seen instances historically where this led to more serious arcing and the switch itself, due to the heat generated, had melted. I'd not be able to say it's safe or not without inspection but as others have stated it should not really be sparking...
     
  11. maklabouhlel

    Hitman

    Joined: Nov 26, 2009

    Posts: 894

    The sparking is actually inside the unit. Sorry, I should have been more clearer.
     
  12. EsaT

    Mobster

    Joined: Jun 6, 2008

    Posts: 4,481

    Location: Finland

    PC isn't any industrial plant, so while some coil may keep whine or PSU's rear switch buzzing/crackling sound if not switched fast, there shouldn't be any loud sharp noises in 100% OK PC.
    PC simply doesn't have contactors in there with their lovely closing/opening sound:
    https://youtu.be/eaGqjrMkucc?t=12m5s
    Caused by that need to mimizing arcing/sparking...

    And certainly PSU's parts have no business of doing any sparks.


     
  13. maklabouhlel

    Hitman

    Joined: Nov 26, 2009

    Posts: 894