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SONY KE-42TS2E-turn ON, then OFF immediately

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    #1

    SONY KE-42TS2E-turn ON, then OFF immediately

    Hello everybody and Merry Christmas!!! I have an problem with SONY- plasma tv, when I plugged in tv start an stop after 2 seconds, and red led flash for 2 times...if I repet the procedure make same thing...I have schematic, I check the smps and the voltage are ok.
    I'm soory for my bad English and I need some ideeas...thank's
    Tags: None
    #2
    Re: SONY KE-42TS2E-turn ON, then OFF immediately

    Can you upload schematic? Maybe some pictures
    I assume no responsibility for any stupid suggestions I might post.

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      #3
      Re: SONY KE-42TS2E-turn ON, then OFF immediately

      Schematic it's here



      Pictures I can't make, because it's stop very fastly, after 1-2 secconds

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        #4
        Re: SONY KE-42TS2E-turn ON, then OFF immediately

        Pls a schematic for PS?code

        1-468-720-12

        APS-192

        Thank you

        Comment

          #5
          Re: SONY KE-42TS2E-turn ON, then OFF immediately

          I remember this fault a long time ago on a Sony plasma 42 inch. If I'm not mistaken I believe all circuit boards and panel are produced by fujitsu or Something to that nature however the problem was a feedback circuit on the Y sustain board that was causing the problem. Never did get to finding out what the problem was but I replaced the Y board. Problem solved.
          Last edited by freakaftr8; 12-29-2017, 10:35 AM.
          Did I leave the soldering iron on?

          Comment

            #6
            Re: SONY KE-42TS2E-turn ON, then OFF immediately

            Today I check Va and Vs voltages, and I found them with 2 Volts more then usually.
            Va = 63,3 (noted on label panel) I found it 65,1V
            Vs = 80.2 (on the label), I found it 82,5 V, measured with oscilloscope.
            I putted them at correct voltage, from the label panel note and TV seems to run ok....
            I don't know why, but I think that the problem may be some bad resistors .
            When the TV was in run mode, I grow up Vs, at 82 V and TV stop immediately...that says that the protection are working at upervoltages ...And I think that is no problem on Ysus or Xsus modules.

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              #7
              Re: SONY KE-42TS2E-turn ON, then OFF immediately

              What's voltage at primary capacitors in power supply when runnung,
              Did I leave the soldering iron on?

              Comment

                #8
                Re: SONY KE-42TS2E-turn ON, then OFF immediately

                372V , at black screen appear on display some little stars red and green....on all display.repeat just were is black screen, or something black on image...the tv work with RF antenna

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                  #9
                  Re: SONY KE-42TS2E-turn ON, then OFF immediately

                  Could be aging panel. 372v sounds too low. Power supply overworking possibly. Check feedback resistors on power supply or possibly aging capacitor on primary.
                  Last edited by freakaftr8; 12-30-2017, 12:24 AM.
                  Did I leave the soldering iron on?

                  Comment

                    #10
                    Re: SONY KE-42TS2E-turn ON, then OFF immediately

                    Do you have a schematic diagram for this SMPS?

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