Philips 46pfl5505d/f7 dead

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  • ivtec
    Badcaps Legend
    • Dec 2008
    • 1967
    • USA

    #1

    Philips 46pfl5505d/f7 dead

    Hi guys;i have here an lcd tv that i'm trying to save that i found in the dumpster,
    Philips 46pfl5505d/f7 that is completely dead, no standby led no voltages at Cn2'
    i checked Diodes in circuit ZD951,D950,D951 and all are short in circuit,
    i took them all out of the circuit and tested them and only D951 is short out of the circuit ,if i replace D951 will it fix the tv or do i have to look up for other bad components? Thanks and Happy New Year to you all.




    https://www.badcaps.net/forum/showthread.php?t=48765
    Attached Files
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Philips 46pfl5505d/f7 dead

    Dunno about any other common issues with these Id say give the diode a shot. If they are in parra just run the set with the shorted one removed set will work but replace all 3 at the same time.
    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 !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • ivtec
      Badcaps Legend
      • Dec 2008
      • 1967
      • USA

      #3
      Re: Philips 46pfl5505d/f7 dead

      Originally posted by ReeceyBurger123
      Dunno about any other common issues with these Id say give the diode a shot. If they are in parra just run the set with the shorted one removed set will work but replace all 3 at the same time.
      Thanks ReeceyBurger123;I'm trying to find ZD 591, PK 5920 the tall Diode but can't find it anywhere,i measured it with diode setting.
      I measured the ZD591 5920 and Positive probe on cathode and negative on anode measures OL and positive on cathode and negative on anode 0.678,
      is this normal? thanks
      Attached Files

      Comment

      • ivtec
        Badcaps Legend
        • Dec 2008
        • 1967
        • USA

        #4
        Re: Philips 46pfl5505d/f7 dead

        Hi guys which of these To-220 is good for the Replacement of D951,and D950? and how do i connect it to both D950,951? can you make a schematic please, thanks and Happy New Year




        http://www.mouser.com/Semiconductors...x1mj?P=1z0z73r
        Last edited by ivtec; 12-31-2016, 05:26 PM.

        Comment

        • ivtec
          Badcaps Legend
          • Dec 2008
          • 1967
          • USA

          #5
          Re: Philips 46pfl5505d/f7 dead

          Originally posted by ivtec
          Hi guys which of these To-220 is good for the Replacement of D951,and D950? and how do i connect it to both D950,951? can you make a schematic please, thanks and Happy New Year




          http://www.mouser.com/Semiconductors...x1mj?P=1z0z73r
          Hi there anybody there? can you please advise

          http://www.mouser.com/Search/Product...4-APT10SCD120K

          Comment

          • Agent24
            I see dead caps
            • Oct 2007
            • 4929
            • New Zealand

            #6
            Re: Philips 46pfl5505d/f7 dead

            Originally posted by ivtec
            Thanks ReeceyBurger123;I'm trying to find ZD 591, PK 5920 the tall Diode but can't find it anywhere,i measured it with diode setting.
            I measured the ZD591 5920 and Positive probe on cathode and negative on anode measures OL and positive on cathode and negative on anode 0.678,
            is this normal? thanks
            Did you measure in-circuit or out of circuit? I think ZD591 is in parallel with the other 2 diodes. If you measure in circuit you will get false readings.

            But, zener diodes can't be tested with normal diode test for correct breakdown voltage, only to check if they're not open\shorted anyway.


            As for replacement of the diodes...
            Going from the other thread, the diodes are SB260s. That's 2A at 60v.
            (https://www.badcaps.net/forum/showpo...3&postcount=32)

            A single SB580 as suggested should work. The board looks like it already has a space for a single, larger, DO-201 package diode anyway.
            You could get http://www.digikey.com/product-detai...0CT-ND/3504367

            It doesn't have to be a TO-220 package, although one of those with a heatsink might last longer. I do suspect it's more likely due to variances in forward voltage, one of the original SB260s probably just ended up taking more current and overheating.
            Last edited by Agent24; 01-01-2017, 08:14 PM.
            "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
            -David VanHorn

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