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High pitch noise from PSU - not all the time

Discussion in 'Electronic Repair' started by [email protected], May 25, 2007.

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  1. Guest

    I have a new PC and it comes with a high pitch noise ! but it does
    not occur all the time.
    When I power up, I get the noise (more often than not). But if I reset
    the PC a few times, it will go away. But sometimes, when I power up,
    I don't get the noise.
    So it's not permanent.

    Would like to hear from you what could be wrong ? Thanks.
     
  2. (known to some as )
    scribed...
    Some off-the-shelf no-name PC's (and even some of the name brands)
    come with poor-quality switching supplies. Such supplies can be audibly
    noisy, and the pitch can change as the load on the supply does.

    If you truly suspect your power supply is the culprit, and it is a
    standard ATX or whatever the current form factor is, you would do well
    to invest some $$ (expect around $100 or so) in a better supply from a
    reputable maker.

    I've had outstanding results with supplies from PC Power and
    Cooling (www.pcpowercooling.com). Another good name is Astec (hard to
    find, but great stuff).

    Happy hunting.
     
  3. Jamie

    Jamie Guest

    bad Fan ?
     
  4. hr(bob)

    hr(bob) Guest

    What make and model? Is it still under warranty? Have you listened
    to another similar computer before you bought this one?

    H. R. (Bob) Hofmann
     
  5. Meat Plow

    Meat Plow Guest

    Take it back and get another.
    --
    #1 Offishul Ruiner of Usenet, March 2007
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    #1 Bartlo Pset, March 13-24 2007
    #10 Most hated Usenetizen of all time
    #8 AUK Hate Machine Cog
    Pierre Salinger Memorial Hook, Line & Sinker, June 2004
    COOSN-266-06-25794
     
  6. Rick

    Rick Guest

    Without a better description of "high pitch noise" it could be anything.
    Where is the noise coming from? (Please don't respond "the computer.")
    Do you hear it from the speakers? Is it coming from the fan vents in the
    power supply? Does it sound mechanical in nature - like a metal on metal
    noise - or is it a high pitched squeal that changes pitch or volume
    before it disappears?

    Rick
     
  7. Eeyore

    Eeyore Guest

    Quite likely to be the ferrite cores in the PSU 'singing' as a result of
    magnetostriction.

    Graham
     
  8. How do you solve this? Will a coat of varnish stop them from singing? I have
    a psu that sings in the 14-16khz range when it is on standby.

    - Mike
     

  9. The first thing you have to do is find the exact source of the noise.
    A piece of small flexible plastic tubing will help. Put one end in your
    ear, and use the other to probe the inductors and other components to
    determine which is causing the problem. Depending on what you find will
    determine the next steps.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  10. I guess the question was more out of curiosity rather than actually reparing
    it. It will probably be months before I have time to mess with that psu.
     

  11. At least you know where to start! :)


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  12. Guest

    AcBel 450W. Yes still under warranty. No, I've not check this PSU
    before I bought it.
     
  13. Guest

    The issue I have is that it's not always giving the noise. And the
    noise does not go away (once it started) with load. I had to reset
    the machine a few time during boot up and after that, it goes away and
    would not happen until the next boot up.
     
  14. Guest

    Without a better description of "high pitch noise" it could be anything.
    Not the speakers.
    Yes. It seems to be loudest from the fan vents of the PSU. I didn't
    open the case to check though. I will do it tonight.
    No.. it's like those old TV high pitch but not so high and loud.
    definitely not mechanical. It does not disappear on its own. It
    start when I boot up ... when I press the on button on the PC front.
    Sometimes, it does not come. But when it does (which is more often
    than not), I have to press the on button or the reset button or Ctrl-
    Alt-Del to restart the computer. Sometimes, it goes away with 1
    reset. Sometimes, after 2 or 3. But it does go away.

    If the first time, I boot up and the noise does not come, it will not
    come during the whole session when the PC is boot up.

    But sometimes, when I first boot up, there is no noise.

    Thanks.
     
  15. Guest

    What is that ? How to solve ?
    Thanks.
     
  16. Eeyore

    Eeyore Guest

    Once you get a noisy one it seems to require replacement. The varnish might do
    it if it was a vacuum varnish process !

    Some ferrites also 'hiss' btw due to controller chip behaviour AIUI.

    Graham
     
  17. Eeyore

    Eeyore Guest

  18. Vey

    Vey Guest

    This thread is getting silly. You just bought the machine. It is under
    warranty. If you are unhappy, take it back.
     
  19. Guest

    This is a DIY after 7 days. Have to do own troubleshooting. Can't
    just return the whole machine. Please see things from other's
    perspective.

    Anyway, I change the PSU and still have the same problem. I then
    change the Motherboard and it seems like the problem is solved.
     
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