Philips 42PFL7422D/37 power supply issue

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  • marconi18
    New Member
    • Aug 2013
    • 4
    • Poland
    #1

    Philips 42PFL7422D/37 power supply issue

    Hi, recently I bought a broken Philips 42PFL7422D/37. I'm electronics hobbiest so I wanna try to fix it. If I try to turn it on, there wasn' t any sound or picture. There's heard only click.
    I replaced the parts which were bad (by visual) and some kind of diodes after checks. I was download manual service and then checks almost everything. There is only 120V AC out to main board (1P02); four big caps have about 152V DC; MC34067P on 15 pin there is growing and falling DC voltage (9-15,26V). I think it will be easier to show my measure on Block Diagram.
    Could You help me? What I have to check in this power supply?
    Thanks
    (sorry 4 my language)
    Attached Files
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    • PhilipsKSI
      Member
      • Oct 2013
      • 13
      • USA
      #2
      Re: Philips 42PFL7422D/37 power supply issue

      I'm trying to fix one of these myself. However, you may have different power board given you are in 220V/50Hz region (PAL).
      Everything, including my Philips TVs, are subject to birth, disease, old age, and finally death.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Philips 42PFL7422D/37 power supply issue

          Check R3318 to see if it is OK, that is the common failure component.
          http://s807.photobucket.com/user/bud...?sort=3&page=1
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • marconi18
              New Member
              • Aug 2013
              • 4
              • Poland
              #4
              Re: Philips 42PFL7422D/37 power supply issue

              budm I was check almost every part of Primary Side this board(resistor 3318 is good).
              PhilipsKSI I have a transformer from 220/110V.
              Are there any test points or any standard Voltages on this board which I should check to make sure that I go right way?
              I'm just a beginner so I'm asking...
              I have a question. I was connect this broken board on my table, giving +5V from LAB Power Supply to 7th pin of 1P11 connector. How can I simulate START this board? Which of pins I should cross/close ?
              Thx

                Comment

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