LG 65UB930T - Standby Light can trigger but TV dead

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  • wushumike
    Member
    • Jun 2016
    • 41
    • singapore
    #1

    LG 65UB930T - Standby Light can trigger but TV dead

    The problem: When remote controller is press, the TV seems to wake from standby light goes off; but there is no backlight, image and sound. The relay did click on.

    I have removed the power board to check. Using 2 x 10K resistor from 3.5V to PWR_ON AND DRV_ON, all the voltages is correct.

    The main board has a red LED and is lited, but the optic link does not light up.

    The Power board after sometime will start to blink x 5 interval.... I would assume this is to indicate DRV_On not working.

    Any expert here came across the same problem? I suspect is the main logic board but cannot confirm.
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    • Diah
      Badcaps Legend
      • Feb 2013
      • 6357
      • Germany
      #2
      Re: LG 65UB930T - Standby Light can trigger but TV dead

      try to put yours DMM probe on BL LED+ and - on each group of the white and black socket and compare the high and low voltage on each group at start up

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