No picture 42PC3

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  • paulstef
    Badcaps Veteran
    • Dec 2013
    • 724
    • Canada
    #21
    Re: No picture 42PC3

    -VY ramps up from 0 to 27V in about 5ms, then stops and tries again afterabout 12ms. Does this a few times then stops and tries again after some more time.

    What do I supposed to have on -VY?

      Comment

      • paulstef
        Badcaps Veteran
        • Dec 2013
        • 724
        • Canada
        #22
        Re: No picture 42PC3

        Ok, from the label on the panel it seems I should have -180 on -VY.

          Comment

          • paulstef
            Badcaps Veteran
            • Dec 2013
            • 724
            • Canada
            #23
            Re: No picture 42PC3

            IPM is ok, no other bigger semiconductor is damaged. I separated the buffer from the sustain board, still the same weird -VY voltage ramps. Why they don't just give us the schematic!!!!

              Comment

              • paulstef
                Badcaps Veteran
                • Dec 2013
                • 724
                • Canada
                #24
                Re: No picture 42PC3

                Just to conclude, it turns out that the little pnp- transistor Q2 in a SOT-89 package on the Y-sustain board, driver for the bigger transistors on the heatsink was also damaged. Tv works.

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