Philips 22pfl4507 No Power

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  • pauldow
    Senior Member
    • Oct 2012
    • 92
    • US

    #1

    Philips 22pfl4507 No Power

    Hi,

    Today's project is this Philips television. No backlight, no LEDs, no sounds out of it.

    Found a blown fuse. Replaced it, and it blew right away.

    I found the thread:
    https://www.badcaps.net/forum/showthread.php?t=24681
    which is about a 22PFL3505D

    That one had a bad diode. I found a shorted 36V Zener diode.1ZB36. It's located just behind (out of sight) that small heat sink on the photo. The reverse side photo has the location circled.

    Since it looks like I can't get this locally, I was wondering if there's any other components I should check before placing an order. I see there are some items on eBay that have a repair kit for this power supply with 7 components.

    That semiconductor on the heat sink is a TK5A50D switching regulator, and the transistor above the 1W resistor says 208 C3203 Y

    Thanks for any help
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Philips 22pfl4507 No Power

    Did you test that Zener diode off the board? That diode may be connected in parallel with >1 Ohms resistor.
    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

    • pauldow
      Senior Member
      • Oct 2012
      • 92
      • US

      #3
      Re: Philips 22pfl4507 No Power

      Yes I did remove it.

      On my meter's diode setting, it's showing 0.005V in both directions.

      I put it on the resistance scale, and it reads 2.6 ohms in both directions.
      Last edited by pauldow; 03-05-2015, 10:40 AM.

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 7969
        • Canada

        #4
        Re: Philips 22pfl4507 No Power

        Did you check the other diodes and the mosfet for short?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Philips 22pfl4507 No Power

          Did you check the power MOSFET mounted on the heatsink for shorted Source to Drain pin?
          This one of those cheaply made two-Transistors switching power supply that usually take out the MOSFET, the OPTO, the diodes, etc. when the diode in the secondary side shorted out or due to shorted load.
          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

          • pauldow
            Senior Member
            • Oct 2012
            • 92
            • US

            #6
            Re: Philips 22pfl4507 No Power

            The 4 rectifier diodes, and the one mounted diagonally just to the left of the MOSFET checked out OK.

            I pulled out the K5A500, and I get .4 ohms from the source to drain. (My ohmmeter has .2 ohms showing when I touch the leads.) So it looks like that one is shorted.
            I now see that 0.68 ohm resistor is open too.

            It looks like the easiest way to fix this is to order the repair kit.

            Thanks for pointing me in the (hopefully) right direction.
            I'll post back here when I get the parts changed.

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 7969
              • Canada

              #7
              Re: Philips 22pfl4507 No Power

              it would have surprised me if only that zener would be gone.
              check that diode left to the mosfet and check that small transitor right above the green resistor too.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Philips 22pfl4507 No Power

                You are going to be replacing lots of parts in this board.
                How about the diodes in the secondary side, the opto-isolator, etc.
                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

                • pauldow
                  Senior Member
                  • Oct 2012
                  • 92
                  • US

                  #9
                  Re: Philips 22pfl4507 No Power

                  Sorry for the delay getting back to you.
                  You guys are right. So far I found a transistor, resistor, the optocoupler and three diodes are bad.

                  Unfortunately the repair part kit is already on its way to me. It's looking like it would be a lot easier to just replace the board for about $35, although replacing components does give me a better feeling.
                  Attached Files

                  Comment

                  • CapLeaker
                    Leaking Member
                    • Dec 2014
                    • 7969
                    • Canada

                    #10
                    Re: Philips 22pfl4507 No Power

                    I am hoping the repair kit does have all of these parts you are going to need.

                    Comment

                    • Andrew F. Ali
                      Badcaps Legend
                      • Jan 2014
                      • 2450
                      • Trinidad & Tobago

                      #11
                      Re: Philips 22pfl4507 No Power

                      If the repair kit is on its way then wait and change out the components. Try it and if it works smile. If it doesn't...no...don't cry. Order a new board. I recommend ShopJimmy as They are to me the easiest and most reliable source for replacement boards.

                      Comment

                      • pauldow
                        Senior Member
                        • Oct 2012
                        • 92
                        • US

                        #12
                        Re: Philips 22pfl4507 No Power

                        Well I got the repair kit this afternoon, and replaced all the components it came with. Even the ones that I thought were probably good.

                        (It did come from Jimmy.) For future reference, it's their part number 267074.

                        The attached photos show what I replaced. Budm was right in that there were quite a few parts that needed to be changed out.

                        Got it back together, and it works. The landfill will have to wait a bit longer before it gets this one.

                        I had thought the opto isolator and that diode circled on the Cold side were bad, but they weren't included in the kit. Since the TV works, they must be OK.

                        Thanks everyone for the direction on this,
                        Paul
                        Attached Files
                        Last edited by pauldow; 03-10-2015, 02:30 PM.

                        Comment

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