Lg42lh30 power supply

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  • ibgm
    Senior Member
    • Oct 2013
    • 63
    • usa
    #1

    Lg42lh30 power supply

    Hey Guys-
    I have this on my bench right now. I'm looking at the power supply board and there is a diode that popped on it. It's D601 on the board. It's mounted to a heat sink. Unfortunately, when it blew, it knocked the marking off of it. Anybody out there know what the p/n is? or maybe the characteristics of the diode? It's board # EAX55357705/4
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Lg42lh30 power supply

      LG EAY57681305 Power Supply / Backlight Inverter
      https://www.shopjimmy.com/lg-eay5768...pply-unit.htm#
      I do not have the P/N but that is PFC diode, Anode is on the right pin, it is non Isolated tab to-220 casing.
      You need to check the two PFC MOSFET's mounted on the same heatsink, also check fuse F501 too. Is the main AC fuse still good?
      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

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9588
          • Canada
          #3
          Re: Lg42lh30 power supply

          I don't have the exact board but a similar board uses a FSU10B60

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Lg42lh30 power supply


              I would go with at least 800V rating.
              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

                • ibgm
                  Senior Member
                  • Oct 2013
                  • 63
                  • usa
                  #5
                  Re: Lg42lh30 power supply

                  WOW! Thanks for the quick replies guys! I really appreciate it. Yes, the fuse was blown out. I had a 1000V volt TO-220 to try but I'm glad I didn't. The switching time on the one I have is 25µs not 40ns. That would have been a problem. I'm gonna rummage around my spare parts and see what I can come up with.
                  Thanks Again Guys!

                    Comment

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