LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

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  • Noobwithamultimeter
    Senior Member
    • Apr 2021
    • 94
    • Canada

    #1

    LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

    Just replaced all the LED strips and successfully turned on the set and even watched some HDR content, but then noticed a small piece of dirt dead center in the screen. Tried flicking the screen to get it to drop to the bottom as well as static-charging a cloth and rubbing it to make it go down the screen, but no luck.

    So I proceeded to disassemble the whole set again. You can guess what comes next.

    The set lights up fine, but blinks 3 red blinks and no menu or anything else. The screen looks fine, but there could be panel damage or a short. Also the lights stay on.

    Any ideas?
  • Noobwithamultimeter
    Senior Member
    • Apr 2021
    • 94
    • Canada

    #2
    Re: LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

    https://www.youtube.com/watch?v=zTSLhmHdPiI

    should I try this?

    Comment

    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England

      #3
      Re: LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

      Double check the flex cables to the screen and all the other cables are plugged in correctly also check a corner of the screen isn't cracked, they are the usual points of failure during a repair.

      Comment

      • Noobwithamultimeter
        Senior Member
        • Apr 2021
        • 94
        • Canada

        #4
        Re: LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

        Cables secure, corners are all fine.

        Comment

        • Noobwithamultimeter
          Senior Member
          • Apr 2021
          • 94
          • Canada

          #5
          Re: LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

          I tried the half screen test and look what I found. RIP panel.
          Attached Files

          Comment

          • diif
            Badcaps Legend
            • Feb 2014
            • 6978
            • England

            #6
            Re: LG 55UJ6200 - backlight turns on, power light blinks 3 times, nothing else

            Caused by a damaged flex to the screen I think.

            Comment

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