32MF231D/37 pulsing 24V under load, backlight flashing

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  • football0062
    Senior Member
    • Dec 2011
    • 98

    #1

    32MF231D/37 pulsing 24V under load, backlight flashing

    does anyone have a service manual for this guy? 32MF231D/37 found a parts list from elektrotanya but need to see the schematic for the power supply. no load its fine right at 24V. under load of the inverters its pulsing all over and flashing the screen then shuts off. can hear a buzzing from the transformer on the power supply. replaced the power supply already but it was an ebay item. doing the same thing
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: 32MF231D/37 pulsing 24V under load, backlight flashing

    https://www.badcaps.net/forum/showthread.php?t=39740

    Inverter , power supply board P/N? BN44-XXXXXX?
    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

    • football0062
      Senior Member
      • Dec 2011
      • 98

      #3
      Re: 32MF231D/37 pulsing 24V under load, backlight flashing

      Pn# 313815866811
      Attached Files

      Comment

      • football0062
        Senior Member
        • Dec 2011
        • 98

        #4
        Re: 32MF231D/37 pulsing 24V under load, backlight flashing

        inveter pn # 996510005766
        Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: 32MF231D/37 pulsing 24V under load, backlight flashing

          There are four SMD MOSFETs (8-pin) on each inverter board. Can you read the P/N to get the pinout to check the Source and Drain pins for shorts?
          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

          • tvrepairguy
            Brdcst Engineer
            • Jun 2014
            • 15
            • United States

            #6
            Re: 32MF231D/37 pulsing 24V under load, backlight flashing

            i repaired my own tv...(a magnavox).. that had that buzzing sound. i thought it was the transformer for the longest time till i tried a can of air. turn it upside down and spray the part you think it is. i found out it was a zener diode that was the problem. replaced it and the tv turned right on and worked. it was right under my transformer

            Comment

            • tvrepairguy
              Brdcst Engineer
              • Jun 2014
              • 15
              • United States

              #7
              Re: 32MF231D/37 pulsing 24V under load, backlight flashing

              try spraying these and see if the buzzing changes. sound of the buzz should get higher then go back down as it warms back up
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: 32MF231D/37 pulsing 24V under load, backlight flashing

                450V capacitor can go bad causing this issue, if all else tests good.
                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

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