HiPro HP-D250AA0 HPD250AA0 PSU Buzzing In Standby

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  • jay007
    Member
    • Jul 2008
    • 15
    • UK
    #1

    HiPro HP-D250AA0 HPD250AA0 PSU Buzzing In Standby

    Has anyone had any joy silencing these supplies?

    I don't know if they buzz from new but glue on almost every through hole component do not ooze any confidence.

    If i put a wooden chopstick like stick on C806 (picture 4) the buzzing gets noticeably louder without having to put your ear on the stick.

    Now i don't have any schematics or do i know enough about PSU design to work out what value it should be so i changed all the through hole diodes and the standby cap but not the 2 little caps on the left side of picture 3 and the buzzing continues.

    R803A, B and C all test ok @ 33k and R801 @ 100k

    Other than the 2 small caps on the topside that i have not yet changed where do i go next?
    Attached Files
    Last edited by jay007; 02-15-2017, 12:28 PM. Reason: forgot to add pics
    Tags: None
    • jazzie366
      Badcaps Veteran
      • May 2016
      • 304
      • United States
      #2
      Re: HiPro HP-D250AA0 HPD250AA0 PSU Buzzing In Standby

      Is it just me, or is there a wire/component lead sticking through the joint and touching that cap you mentioned? It also looks like there is a minimal amount of solder on that joint, try reflowing it?
      Popcorn.

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