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Power supply on lt37hvs

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    #1

    Power supply on lt37hvs

    I have a tv model lt37hvs .The problem I am having is everything turns on for about 10 seconds the shuts off.You hear a clicking noise when it shuts off.I looked for bad solder joints the only thing I find is a shorted Zener diode but I can not find a way to identify it so I can replace it.It seems to connect to one of the legs of 20n60c3.power supply model is aep001 9191170013 rev3.looks like a fast acting diode d22 maybe it being shorted is shutting down my power supply.any help is welcomed thanks
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    #2
    Re: Power supply on lt37hvs

    Here pic of 20n60c3
    Attached Files

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      #3
      Re: Power supply on lt37hvs

      That is the Gate discharge diode (it is in series with R76) which there is another resistor connected in parallel with that D/R.
      That circuit is the PFC Voltage booster so if the circuit does not work then you will not have >360VDC on the main filter cap, so you need to check that voltage.
      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: Power supply on lt37hvs

        What happen if the diode is shorted

        Comment

          #5
          Re: Power supply on lt37hvs

          Lifted one leg the doide is not shorted I will pull my esr and check my caps

          Comment

            #6
            Re: Power supply on lt37hvs

            That happens, sometimes diodes shows a short in circuit, just to take it out and it may be good. That all depends on the circuit the diode is in.

            Comment

              #7
              Re: Power supply on lt37hvs

              Gate drive will usually have diode in parallel wit 10 Ohms resistor.
              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

                #8
                Re: Power supply on lt37hvs

                I have a LT37HVS and have replaced the capacitors and while the power light comes on the minute I turn the tv on it shorts out or shuts down totally. I can unplug the tv and plug it back in and the power light comes back on but I get no picture or sound. Any hints?

                Comment

                  #9
                  Re: Power supply on lt37hvs

                  This is what i found on mine the solder joints on the power supply where connectors connect had bad joints so i just resolder them also the heat sink near the power plug had bad solder joints i resoldered it and the tv stays on now.
                  Attached Files

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                    #10
                    Re: Power supply on lt37hvs

                    great work!

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