Philips 37PF9975 - comes on and shuts off

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  • Jooo
    Badcaps Veteran
    • Oct 2011
    • 222
    • Finland

    #1

    Philips 37PF9975 - comes on and shuts off

    I have this Philips 37PF9975 plasma TV. When I turn it on, relay clicks, green light comes on, faint buzzing sound, panel goes on (but no picture) and then within couple of seconds relay click and it shuts off.

    I found tom66's thread with same model TV here

    If I freeze those four 10nF 630V ceramic caps, it will do exactly the opposite than what tom's did: it will shut down quicker, and the panel doesn't come on.
    When I heat the area the panel will come on again for couple of seconds and then shut off.

    By the way all of those 10nF ceramic caps measure 17nF, is this allright?
  • Jooo
    Badcaps Veteran
    • Oct 2011
    • 222
    • Finland

    #2
    Re: Philips 37PF9975 - comes on and shuts off

    Found the fault - two 100uF 16V SMD capacitors - one measures 3,1ohms, another one measures 11,8 ohms. Heated these up and the tv stayed on.
    The question is, can I replace these with regular through-hole capacitors?

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: Philips 37PF9975 - comes on and shuts off

      Yes, I would use glue to secure them though.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • Jooo
        Badcaps Veteran
        • Oct 2011
        • 222
        • Finland

        #4
        Re: Philips 37PF9975 - comes on and shuts off

        Thanks. It turned out that actually almost all of the SMD caps were bad.
        Only four tested good.
        There were also two bad Rubycon YK:s, a 220uF 25V and a 22uF 50V. I replaced them with Rubycon YXA 220uF 35V and 22uF 50V.

        This is what I used for the SMD caps:
        100uF 16V - Nichicon PW 100uF 25V
        47uF 16V - Chemi-Con KME 47uF 25V
        22uF 35V - Rubycon YXA 22uF 50V
        4.7uF 35V - Chemi-Con KY 4.7uF 50V
        2.2uF 50V - Panasonic FC 2.2uF 50V

        There were also two 10uF 100V and one 1uF 100V SMD cap that I left because I had no replacements on hand for them, but they tested good.
        The 22uF 35V capacitor tested open, most of the other caps had over 10 ohms ESR. Few of the old caps had over 20ohm esr.

        I soldered the new caps in, turned the TV on and its working flawlessly
        Another TV saved from landfill.

        Comment

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