Sony J30 PSU repair

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  • dadi
    New Member
    • Jan 2012
    • 5
    #1

    Sony J30 PSU repair

    Hi Click image for larger version Name: BoardBack.jpg Views: 429 Size: 4.69 MB ID: 3255905 Click image for larger version Name: BoardFront.jpg Views: 78 Size: 5.45 MB ID: 3255906
    I am trying to repair an old Sony j30 PSU, which I have no information about or schematics.
    I am not an expert in electronics, but I would appreciate some help.
    I recapped the whole PSU and still no output, though I get about 15-24v on the power transistors on the primary side. The MC33262 controller gets about 15v.
    I get no power on the secondary side.
    By the shottcky diode, where I think I have a short, as I replaced the component that seemed to be a diode (white like those connected to the power transistors with no marking on it, or the board itself). but it didn't change anything.
    Any idea how to proceed?
    Thank you in advance for any help
    Joe
    ​

    Click image for larger version Name: BoardFront.jpg Views: 78 Size: 5.45 MB ID: 3255907
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    • kasfamily
      Badcaps Veteran
      • Aug 2014
      • 765
      • Russia
      #2
      What country are you from?
      How many volts are on the C7?

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