Wintel Win1X STB

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #1

    Wintel Win1X STB

    Two days ago, I repaired a Wintel Win1X digital terrestial STB for my class instructor at TAFE, which he told me the box took about 20 minutes to start up. Looking through the vents when I was at TAFE, I saw two bulging capacitors (which were C8 and C10).

    I did not take my changes of powering up the box before replacing the electrolytics, for the possibity of overvoltages caused my heavy loading of a rail through bad electrolytics.

    All of the electrolytics were replaced with Nippon Chemi-Con SXE series, except for C2, with a Nippon Chemi-Con KMH Series (Nippon Chemi-Con is my first choice in quality Japanese electrolytics... been in business since 1931! : )

    As a good measure, I decided to make the following changes, board space permitting:
    C8 (1000uF 16V) with 2200uF 16V
    C9-C10-C11 (470uF 16V) with 2200uF 16V
    C12 (220uF 16V) with 1000uF 16V
    C13-C14 (220uF 16V) with 470uF 25V
    C15-C16 (100uF 35V) with 470uF 35V
    C17-C18 (47uF 50V) with 220uF 50V
    C4 (10uF 50V) with 100uF 50V
    and finally, C2 (68uF 400V) with 220uF 400V, as another good measure...

    Now the box powers on within seconds, and is working perfectly, and also under bench testing, which shows no further problems.

    The electrolytics replaced were brand "DM", ZL series, and two with a "S" logo, SK and EX series. Does anyone know about them?

    It was too bad that a German manufacturer was let down with bad electrolytics...
    Attached Files
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
  • arneson
    Badcaps Legend
    • Sep 2005
    • 1267

    #2
    Re: Wintel Win1X STB

    http://www.epassives.com/s.nl/sc.2/category.2097/.f

    This is close but can't tell. Good job with repair. On this site it's
    interesting that right after temperature rating is the 2000 hr spec.
    That looks like expected life.
    Last edited by arneson; 10-06-2005, 07:13 PM. Reason: footnote
    Jim

    Comment

    • PeteS in CA
      Badcaps Legend
      • Aug 2005
      • 3579
      • USA, Unsure of Planet

      #3
      Re: Wintel Win1X STB

      That would be 2000 hours at full rated ripple current and at max. rated temperature. If you check a datasheet, you'll see that mfrs publish multipliers that take into account lower currents and temperatures.
      PeteS in CA

      Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
      ****************************
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