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Panasonic 32" LCD TV broke, model TC-32LE60

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    #1

    Panasonic 32" LCD TV broke, model TC-32LE60

    Hey, our Panasonic TV upstairs just broke. Its made in '06. Don't let that fool you, cuz we paid good money for it, and upon opening, theres all Japanese caps inside!

    Just turned it on via remote, the power supply relay clicked on as normal, then BANG! Something must have blown, but there is no smell. Now the TV wont turn on, and the power light blinks two times.

    So of course, within minutes I opened it up, and there are no burn marks or burned parts except for one suspicious SOT-23 transistor, which appears to have a burn on it.

    No fuses blown.
    Haven't checked voltages yet, but I will do that tomorrow.

    I am looking for a repair manual for the TV, please let me know if you have one!

    And I will be posting pics tomorrow, its getting late right now.

    -Ben
    Muh-soggy-knee
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    #2
    Re: Panasonic 32" LCD TV broke, model TC-32LE60

    1) I would check the bridge rectifier and power mosfet for shorts.

    2) You can also test all the diodes that are mounted on the heatsinks to make sure they are not shorted as well.
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      #3
      Re: Panasonic 32" LCD TV broke, model TC-32LE60

      Originally posted by retiredcaps View Post
      1) I would check the bridge rectifier and power mosfet for shorts.

      2) You can also test all the diodes that are mounted on the heatsinks to make sure they are not shorted as well.
      1 - All rectifier diodes test good.

      2 - no shorts, because the PS fuses are good. The standby voltage is provided by a small smps with an 8 pin DIP control chip. And the other smps uses an integrated switching device, an STR G9626. Also the NTC tests good.

      Its almost like the TV tries to turn on, but there must be a short somewhere.

      -Ben
      Muh-soggy-knee

      Comment

        #4
        Re: Panasonic 32" LCD TV broke, model TC-32LE60

        2 blinks is "INVERTER SOS, NO BACKLIGHT DETECTION ".
        Confirm you are getting 24 volts and INV-ON to the inverter when you first try to turn it on, then, if both are good, check for something blown on the inverter.

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          #5
          Re: Panasonic 32" LCD TV broke, model TC-32LE60

          Originally posted by randtek View Post
          2 blinks is "INVERTER SOS, NO BACKLIGHT DETECTION ".
          Confirm you are getting 24 volts and INV-ON to the inverter when you first try to turn it on, then, if both are good, check for something blown on the inverter.
          Ah ok,

          sooooooo... I turned it on this morning, and its working!?

          I think the mosfets in the inverters are in a half bridge config, but two are paralleled, so maybe one has gone, and the other is doing all the work. It probably will soon overheat.

          Gonna check voltages, and the mosfets later!

          -Ben
          Muh-soggy-knee

          Comment

            #6
            Re: Panasonic 32" LCD TV broke, model TC-32LE60

            Originally posted by ben7 View Post
            I think the mosfets in the inverters are in a half bridge config, but two are paralleled, so maybe one has gone, and the other is doing all the work. It probably will soon overheat.
            Unlikely... MOSFETs mostly fail shorted. Possibly the shorted one fused from the high current flowing through it though.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

              #7
              Re: Panasonic 32" LCD TV broke, model TC-32LE60

              Ben 7 I'm having the same problem you described on 3/6/12. Did it continue to work after giving it an overnight rest? Or did you have to replace the inverter board. We have no TV repair guy in this region!!!! I hate to throw the thing out if I can plug in a new part.

              Comment

                #8
                Re: Panasonic 32" LCD TV broke, model TC-32LE60

                Originally posted by dmayer View Post
                Ben 7 I'm having the same problem you described on 3/6/12. Did it continue to work after giving it an overnight rest? Or did you have to replace the inverter board. We have no TV repair guy in this region!!!! I hate to throw the thing out if I can plug in a new part.
                I plugged it in to test power supply voltages and when I turned it on, it came on just fine... really confused me! I never did find out what made it do this.

                FYI, The TV is still working just fine to this day....

                My only guess as to what happened is as follows:
                Maybe a ceramic capacitor shorted out, and the stored energy from another capacitor flowed through the short, blowing the capacitor apart (therefore removing the short).
                The PSU went into protection when the voltage rail dipped, and the TV displayed the blink code.
                That is what I think happened. It's only a hypothesis
                Muh-soggy-knee

                Comment

                  #9
                  Re: Panasonic 32" LCD TV broke, model TC-32LE60

                  Maybe cracked solder joints in the inverter.
                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                  -David VanHorn

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