Repairing a LG 47LN5750 with LED strips from a different model

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  • johnboy1313
    Badcaps Legend
    • Nov 2012
    • 1959
    • USA

    #1

    Repairing a LG 47LN5750 with LED strips from a different model

    I found this TV in a dumpster this week. It would flash at startup and then had no picture. I opened it up today and found three bad strips. My method is to record a video of the flashing LEDs and then take a screen shot of the paused video showing the LEDs lit. Once I identified the bad strings, I got to work. I was hoping to be able to get at lease one good string out of the three bad ones. It didn't work out that way. Fortunately, I parted out a 42" LG LED TV years ago and still had the LED strips. The 47" strips were made up of two strips, one with 4 LEDs and one with 5 LEDs. The replacement strips were made up of two strips with 6 LEDs each. I removed one or two LEDs from each of the 42" strips based on what was being replaced. I then bridged the pads from the missing LED with solder. Lucky for me, these replacement strips plugged right in just like the old ones.

    This TV is really nice. I'd like to keep it for myself, but it's going to my brother-in-law.
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    Last edited by johnboy1313; 09-26-2015, 01:15 PM.
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Repairing a LG 47LN5750 with LED strips from a different model

    Nice fix mate
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

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    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain

      #3
      Re: Repairing a LG 47LN5750 with LED strips from a different model

      Always good to have spare led strips from smashed screen tvs the lamps always come in useful as finding exact replacements is very hard.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

      Comment

      • johnboy1313
        Badcaps Legend
        • Nov 2012
        • 1959
        • USA

        #4
        Re: Repairing a LG 47LN5750 with LED strips from a different model

        Yeah, I agree. One thing I forgot to add for anyone looking at this in the future is that once you have it working, turn the backlights down. I've got them down to 30 from 100 and the picture still looks really nice.

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain

          #5
          Re: Repairing a LG 47LN5750 with LED strips from a different model

          Yeah I always do that, I dont know why people run them at full ruins and washes out the image I think also kills the leds in no time flat.
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

          Comment

          • nicholas1110
            Senior Member
            • Aug 2012
            • 127
            • usa

            #6
            Re: Repairing a LG 47LN5750 with LED strips from a different model

            Make sure you do a firmware upgrade as well. This will also prevent the LEDs from failing early

            Comment

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