Lg 47 led flashes then goes off

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  • deegee2016
    Member
    • Apr 2016
    • 11
    • england
    #1

    Lg 47 led flashes then goes off

    I have an LG47ODUE that shows LG Logo then goes black under torchlight image is visible.


    Power supply board tests:

    Standby voltages: in order on connector:

    9) Ground - Ground = 0.0v
    8) 12v - NC = 11.95v
    7) 12v - 12v = 11.95v
    6) Ground - Ground = 0.0v
    5) 24v - 24v = 24.77v
    4) Ground - Ground = 0.0v
    3) 3.5v - PDIM2 = 3.54v
    2) 3.5v - PDIM1 = 3.55v
    1) PwrOn - DrvOn = 3.42v

    Most voltages not present until standby button is pressed

    Led Connector Tests:

    106v down to 82.2v at led connector on both lines. LEDs connected

    115v down to 82.2v at led connector on both lines. LEDs disconnected.

    Diode Side Test: (red probe to cathode side and black to test points at led connector)

    97v and decreases - cathode side of diode to test point at led connector.

    LEDs have been checked out of the unit on a DC power supply two strips at 30v all LEDs work.

    Work has been carried out previously as jumpers on led strips. Work fine out of unit on DCPS.

    I had image but no backlight.

    Could this be a caps issue???

    Does the TV need all LEDs connected to work correctly (ie) cut out if not enough LEDs for load.

    Obviously 88.2v is not enough to drive the leds

    Regards Dee
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Lg 47 led flashes then goes off

      Please stick to ONE THREAD!
      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

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