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Hitachi LE55U516 Power supply issue

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    Hitachi LE55U516 Power supply issue

    Hi All . I have a beautiful Recycle Center rescue that has only 5V output and the Main cap stays at 160v even when powered on. From scrolling through this forum on a daily basis I remember that the problem is related to the PWM so i first replaced that IC (IC9301 - A6069H). When that didn't work I replaced (IC9001 - SSC9512S) and it powered on for about 5 min then back to the same issue. I'm close to the problem but I am having a terrible time figuring it out any help would be appreciated.
    Images attached, the ICs for the affected area are listed in case you cannot see them clearly
    IC9001 - SSC9512S
    IC9301 – A6069H
    IC9101,9102 – 11NM50N






    Attached Files
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    2 ea - Samsung 52"
    Samsung 60"

    #2
    Re: Hitachi LE55U516 Power supply issue

    Since you do have 5V STBY then replacing the SMPS IC9301 – A6069H is not the problem.
    When you work on TV power supply board, you should look at the power supply board and section out the board to know which section is the standby section, PFC section, main switched supplies section and then find out if you do have Standby power supply to run the main board or not.
    you need to do step by step of testing the Voltages:
    1) If you do have standby Voltage then check to see if you do have PS-ON command signal (when power switch is activated) from the main board to turn on the PFC and the rest of the power supply or not.
    2) If the PS-ON is not present then look at the main board, if it is present then you should have PFC boosted Voltage around 380~400VDC between the two legs of the main cap.
    3) Without boosted Voltage, the rest of the power supplies will not be running due to lacking the boosted Voltage even though the PS-ON may be present.

    "IC9101,9102 – 11NM50N" That must be an error. Do you mean Q?????
    Last edited by budm; 09-03-2017, 07:23 PM.
    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


      #3
      Re: Hitachi LE55U516 Power supply issue

      Originally posted by budm View Post
      Without boosted Voltage, the rest of the power supplies will not be running due to lacking the boosted Voltage even though the PS-ON may be present.
      The PSON voltage is there, 2.8V. when i replaced IC9101 it worked fine for a few minutes, then it started blanking out before it finally stopped working again.

      Originally posted by budm View Post
      "IC9101,9102 – 11NM50N" That must be an error. Do you mean Q?????
      Typo.. Q9101,Q9102
      Craigslist Picks & Fixes

      2 ea - Samsung 52"
      Samsung 60"

      Comment


        #4
        Re: Hitachi LE55U516 Power supply issue

        One of the pins looks as though it's not soldered and the others could be tidied up.
        Attached Files
        Willing to help but I'm no expert.

        Comment


          #5
          Re: Hitachi LE55U516 Power supply issue

          Originally posted by dick_barton View Post
          One of the pins looks as though it's not soldered and the others could be tidied up.
          A couple of the pins are not connected and this was not my best soldering.
          Craigslist Picks & Fixes

          2 ea - Samsung 52"
          Samsung 60"

          Comment


            #6
            Re: Hitachi LE55U516 Power supply issue

            I measured the voltages on IC9001 - SSC9512S It's getting the following voltages at power on
            1- 13v
            2 - 13V
            3 - .117
            4 - 0V
            5 - 0V
            6 - 0
            7 - 0
            6 - 0
            9 - 0
            10 - 0
            11 - 0
            12 N/C
            13 - N/C
            14 - .37
            15 - .11
            16 - .11
            17 - N/C
            18 - N/C
            Craigslist Picks & Fixes

            2 ea - Samsung 52"
            Samsung 60"

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              #7
              Re: Hitachi LE55U516 Power supply issue

              any idea?
              Craigslist Picks & Fixes

              2 ea - Samsung 52"
              Samsung 60"

              Comment


                #8
                Re: Hitachi LE55U516 Power supply issue

                Did you resolder properly those pins that looked improperly soldered??

                Comment


                  #9
                  Re: Hitachi LE55U516 Power supply issue

                  This is an old post, but because I don't have pictures of the boards, I was hoping someone could leverage info here and help me out.

                  I have the same model. Works fine, but there are thin vertical lines (not necessarily all the way from top to bottom - sometimes top to 1/3 or 2/3 of the screen) and these are not always there. They seem to come and go depending on the type of picture, colors,...

                  I always thougth vertical lines are panel issues. Any thoughts?

                  Comment


                    #10
                    Re: Hitachi LE55U516 Power supply issue

                    Ignore please.. I started a new thread here:
                    https://www.badcaps.net/forum/showth...761#post953761

                    Comment

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