Philips 37" LCD 37pfl7662d/05

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  • vinceroger69
    Badcaps Legend
    • Mar 2012
    • 6714
    • uk

    #41
    Re: Philips 37" LCD 37pfl7662d/05

    Not conected to anything if you look at the picture theres no wires going to the pins hence Nc.

    Comment

    • michael dranfield
      Badcaps Veteran
      • Jan 2016
      • 232
      • England

      #42
      Re: Philips 37" LCD 37pfl7662d/05

      i
      Originally posted by tom66
      Okay, so I ordered the replacement transformer and removed the old one. Well it is very clearly failed; there is a black mark in one side of the secondary winding, which has also burned the PCB silkscreen. It's in the top right corner.

      What causes these transformers to fail? I thought transformers were generally quite reliable.
      I think you will find its the 90 degree bend round the sharp corner that causes the failure .

      Comment

      • ReeceyBurger123
        Never Give Up !
        • May 2014
        • 7325
        • Britain

        #43
        Re: Philips 37" LCD 37pfl7662d/05

        Originally posted by michael dranfield
        i

        I think you will find its the 90 degree bend round the sharp corner that causes the failure .
        As well as heat and age
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

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        Comment

        • michael dranfield
          Badcaps Veteran
          • Jan 2016
          • 232
          • England

          #44
          Re: Philips 37" LCD 37pfl7662d/05

          The inverter transformers on darforn boards are particularly troublesome by far the most common problem is a change in resistance of one of the secondary windings causing an inverter out of balance circuit to trigger.the secondary windings consist of 3 or 4 strands of fine wire twisted together and due to thermal expansion on the 90 degree bends round the sharp corners exiting the transformer a single strand can snap hence the change in resistance of the secondary winding .the faulty transformer will usually go high in resistance by one third of the value of all the other transformers.

          Comment

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