Samsung LE46C530

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  • nezocas
    Member
    • Oct 2015
    • 27
    • Alcanena

    #1

    Samsung LE46C530

    Hi,

    This tv as got image and sound, but no back ligth.
    Power supply BN44-00341B

    Resistors 802/805/807/810 all 1M5 allready replaced
    C1818 0.47uf measured OK
    Fuse FS802s in the middle of the board OK
    By disconnecting the main board, and if I power up the power supply, the back ligth comes rigth ON
    PFC is LOW only 310v on both filter caps.
    ESR and capacitance on all cap´s were tested

    Need some help
    Regards
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12086
    • U.S.

    #2
    Re: Samsung LE46C530

    Check all the diodes if you haven't already.
    Last edited by nomoresonys; 01-19-2019, 01:00 PM.

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12086
      • U.S.

      #3
      Re: Samsung LE46C530

      Is the service manual in here?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Samsung LE46C530

        Is your AC 230VAC, if it is then at standby the DCV on the main cap should be about 230VAC x 1.414 = 325VDC, you indicate only 310Vdc so you need to verify.
        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

        • nezocas
          Member
          • Oct 2015
          • 27
          • Alcanena

          #5
          Re: Samsung LE46C530

          Originally posted by budm
          Is your AC 230VAC, if it is then at standby the DCV on the main cap should be about 230VAC x 1.414 = 325VDC, you indicate only 310Vdc so you need to verify.
          Yes my AC is 230v

          As you guys asked, when I was checking all diodes, found DP807 (next to FAN ic) shorted in circuit, dessoldered it and it was good outside, next dessoldered CP810 it was good also....I thinked to my self, this "short" is caused by a parallel low value resistor.

          Let´s check the standby voltage at main cap as you guy´s asked.

          To my surprise the backligth came ON.

          I only think one cause to this, the glue under one of those components, causing parasitic readings and forcing the backligth to go OFF.

          Set will be under test the next 2 days....will report back.

          PS: now voltage at main cap raised from 310v to 385v

          Best regards
          Nezocas
          Last edited by nezocas; 01-21-2019, 04:50 AM.

          Comment

          • nezocas
            Member
            • Oct 2015
            • 27
            • Alcanena

            #6
            Re: Samsung LE46C530

            Hi,

            Set repaired

            Thank´s

            Comment

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