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Philips 32 PFL 7762D PSU problem

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    #1

    Philips 32 PFL 7762D PSU problem

    Hello.

    Got myself a bad Philips TV, gives an error code 2, service manual says it stands for "12V missing".

    Two N-channel mosfets shorted, marked Q301 and Q302 on the board, these are for making the 12V and 24V, right? Should I suspect something else gone bad too, anyone?

    The MOSFETS are STP10nk60zfp, what else to look for than the usual current, voltage and RDS on values when getting a substitute? How much the RDS on can differ from the original one? Would FQPF10N60C be an ok choice for replacing the originals?

    Attached the schematics I found from the internet if it's of any help.
    Attached Files
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    #2
    Re: Philips 32 PFL 7762D PSU problem

    I know when i had a shorted fet it took out a pwm ic controller too. This was on the primary side though.
    Do NOT touch heatsinks when testing for voltages as they may be LIVE!

    Comment

      #3
      Re: Philips 32 PFL 7762D PSU problem

      Check or replace the IC that drives these MOSFET's, check the resistors and Diode connected to the Gate of the MOSFET for shorts or open. I recommend replacing the IC because if the out put drive pins are stuck at High (+ drive) it will take out the new MOSFET's.
      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

        #4
        Re: Philips 32 PFL 7762D PSU problem

        Diodes D301 and D302 are OK as are the resistors, these are smd types tested them off-circuit. These are connected to the Gates? Then again resistor R1 is open. It is connected to Drain. D1 tested OK. You still think the IC (DLA001) might be bad? At least none of the pins are shorted to each other.

        Can I replace these:


        with these:

        Comment

          #5
          Re: Philips 32 PFL 7762D PSU problem

          Anyone??

          Could replacing the resistor and the two MOSFETs (and probably the IC that drives them) cure this one?

          Any opinions on those MOSFET substitutes?

          Comment

            #6
            Re: Philips 32 PFL 7762D PSU problem

            I have Philips LCD 32PFL5203/98
            Power Supply Board Number
            Dsp-182CP
            Q602 and Q603 both are K3569 found short circuit with blown open R804 0.10 ohm,no any other parts found short
            Re-install new parts with orignal one but its short again,

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