philips 55pft5201/79 no power

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  • odgaf
    Member
    • Apr 2015
    • 36
    • Australia
    #1

    philips 55pft5201/79 no power

    hiya i got this tv off a rubbish tip, its in excellent physical condition, but no power no led
    i popped the back off took the board out and did some probing with a multimeter, i found a bank of 3 diodes on the cold side that all came up short, i clipped one leg off each one and the last one was dead short, the other diodes are no longer short and give a lowish voltage drop of 0.144 and 0.154
    the diode i took off read dead short and its an SR5100L

    ive ordered this diode an sr5100 its a Schottky but it has no l suffix will it be ok?

    im trying to upload pics of the board from my phone but having issues right now but i will upload them in the next day or so as im pretty sure there might be a problem with the mosfet but i need a bigger soldering iron to get it off the board its on a heatsink i have to desolder, i tried measuring it but couldnt appear to turn it on and off while in circuit, but the readings i got confused me

    i was wondering if theres any checks i can do with the board out, the fuse is ok the caps look good from inspection
    i think the rectifier checked ok but im a novice at this

    ok i got one side of the board sorted here it is
    Attached Files
    Last edited by odgaf; 08-30-2021, 01:25 PM. Reason: photos better
    Tags: None
    • odgaf
      Member
      • Apr 2015
      • 36
      • Australia
      #2
      Re: philips 55pft5201/79 no power

      i really want to fix this tv, its a huge upgrade for me, im broke and in lockdown in melbourne, im getting a more powerful soldering iron if needed to get the heatsinks off

      under the black heatsink is the rectifier and a mosfet, under the silver heatsink is an ic

        Comment

        • tiki66
          Member
          • Jul 2016
          • 35
          • Croatia
          #3
          Re: philips 55pft5201/79 no power

          Usually if there is problem on HOT side fuse would be blown or you would have something shorted.

          I would replace that diode and try if it works. Before that you can check smd components on the other side of the board around diodes.

            Comment

            • odgaf
              Member
              • Apr 2015
              • 36
              • Australia
              #4
              Re: philips 55pft5201/79 no power

              ok ive spent some time on the back of the board and i might have found more issues theres 2 banks of 3 diodes in both banks 2 diodes check ok but i get readings both ways on the bottom diode on each bank,

              im gonna have to get better pictures as you cannot make them out in the photos as they are so small, ill do that later

              on the top side of the board on the hotside there is a inductor next to a huge grey resistor, im getting 0000 on my multimeter on this resistor in ohms and diode mode is this correct ? i wasnt expecting this, do i have to measure this out of circuit ?
              im still waiting for the diode to come through the post
              btw thx for the help

                Comment

                • Snazzysmith
                  New Member
                  • Aug 2017
                  • 8
                  • Australia
                  #5
                  Re: philips 55pft5201/79 no power

                  Did you end up getting it fixed?

                    Comment

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