lg 47ln5200

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  • cdog14550
    New Member
    • Oct 2015
    • 5
    • usa

    #1

    lg 47ln5200

    hoping someone can send me in right direction. Tv was working fine then total blackout, no sound, pic or standby light. would not turn on after thar so shorted out plug wire and held tv power button for a minute, plug in and stand by light came back on and fired right up. lasted about a week and is happing more often and now lasts only about 10 minutes. was thinking ps board or main now i read about possable led light issue. dont want to replace everything!
    thanks in advance
  • Hamie
    Badcaps Legend
    • Apr 2014
    • 1383
    • UK

    #2
    Re: lg 47ln5200

    Pictures and voltage readings would help.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: lg 47ln5200

      Originally posted by hamie
      pictures and voltage readings would help.
      +10
      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

      Comment

      • cdog14550
        New Member
        • Oct 2015
        • 5
        • usa

        #4
        Re: lg 47ln5200

        ill have time to post this weekend
        thx

        Comment

        • cdog14550
          New Member
          • Oct 2015
          • 5
          • usa

          #5
          Re: lg 47ln5200

          ok, heres the voltages when on
          1 3.4 pwr-on 10 3.3 drv-on
          2 3.5 11 3.3
          3 3.5 12 1.0
          4 0 13 0
          5 24.4 14 24.4
          6 0 15 0
          7 12 16 12
          8 12 17 0
          9 0 18 0

          in standby with light on pins 2 and 3 have 3.5v and all others are 0
          according to psu this is all correct and the tv is running properly but at any second black screen, no sound no stand by light and wont power on til i short power cable and hold power button for a minute or so. i will let it run and get voltages when the tv goes to black screen
          Attached Files

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: lg 47ln5200

            Do you lose your PWR_On when it goes to black/no sound
            Willing to help but I'm no expert.

            Comment

            • cdog14550
              New Member
              • Oct 2015
              • 5
              • usa

              #7
              Re: lg 47ln5200

              waiting for over an hour to go black!! never not works when you want it to

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #8
                Re: lg 47ln5200

                Welcome to the joys of servicing.
                Willing to help but I'm no expert.

                Comment

                • Hamie
                  Badcaps Legend
                  • Apr 2014
                  • 1383
                  • UK

                  #9
                  Re: lg 47ln5200

                  Bad solder joint maybe.
                  Try pressing on the power supply with the butt of a screwdriver and see if it goes off.

                  Maybe a bad connection elsewhere try twisting the frame of the tv see if it goes off.

                  Comment

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