LG 55LD520 Troubleshooting Help Needed

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  • Rhyno_78
    New Member
    • Nov 2016
    • 2
    • United States
    #1

    LG 55LD520 Troubleshooting Help Needed

    Hello everyone. I am new to the site and looking for help in troubleshooting a LG Model 55LD520. I have narrowed down what I think is possibly the main board but wanted to seek everyone's thoughts here first.

    To start the tv when powered on would blink red 3 times and then change to brite blue for a second till it dimmed, but stayed on. No backlight was present nor the LG logo utilizing the "flashlight trick". Through a series of isolation on boards and connectors, here is what I found.


    On the power supply board, connector "P201", I have separated the "ERR" & "INV-ON" wires from the connector. By doing this, I get backlights on the tv, but no logo display. If I connect the "ERR" wire to the connector, I get a flashing strobe effect on the screen of the back lights . If I connect the "INV-ON" wire to the connector, the screen goes completely dark with no back light.

    Can anyone help me identify where to go from here ?
    Tags: None
    • johns1mj
      Badcaps Veteran
      • May 2015
      • 242
      • United States
      #2
      Re: LG 55LD520 Troubleshooting Help Needed

      Please post good pictures of the back of the tv so we can see the board arrangement.

      Please post voltages from the connectors.

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