LG Led TV 32LN5300UB Completely Dead

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  • ivtec
    Badcaps Legend
    • Dec 2008
    • 1967
    • USA
    #1

    LG Led TV 32LN5300UB Completely Dead

    Hi guys i found the Lg tv in the curve completely dead, checked power Supply board and no voltages anywhere,no volts in the primary side or secondary side,no volts 3.5v,24v,12v,i checked mosfet q101 and is good,fuses are all good also checked all components that i could check with my fluke and cap analyzer and all seems to be in order,so it seems to be a mystery . Any help will be appreciated to save this tv from landfill.
    Attached Files
    Last edited by ivtec; 07-09-2021, 02:41 PM.
    Tags: None
    • ivtec
      Badcaps Legend
      • Dec 2008
      • 1967
      • USA
      #2
      Re: LG Led TV 32LN5300UB Completely Dead

      Also i get 87v only 'see attachment pic

        Comment

        • ivtec
          Badcaps Legend
          • Dec 2008
          • 1967
          • USA
          #3
          Re: LG Led TV 32LN5300UB Completely Dead

          Also i only see 87v from AC input to fuse?
          Attached Files

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9549
              • Canada
              #4
              Re: LG Led TV 32LN5300UB Completely Dead

              What was the meter set to? AC or DC? Looking at your last picture you are checking the voltage between the fuse and ground. You need to check the AC voltage across Line and Neutral. Not Line and Ground

              Just check the DC voltage ACROSS the main filter capacitor. It should be 160vDC. Then with the board un plugged from ac, check the resistance of R113, it should be about 0.15Ω
              When checking voltages in the Primary, you must reference HOT Ground (C110 negative leg)
              Last edited by R_J; 07-09-2021, 09:54 PM.

                Comment

                • ivtec
                  Badcaps Legend
                  • Dec 2008
                  • 1967
                  • USA
                  #5
                  Re: LG Led TV 32LN5300UB Completely Dead

                  Originally posted by R_J
                  What was the meter set to? AC or DC? Looking at your last picture you are checking the voltage between the fuse and ground. You need to check the AC voltage across Line and Neutral. Not Line and Ground

                  Just check the DC voltage ACROSS the main filter capacitor. It should be 160vDC. Then with the board un plugged from ac, check the resistance of R113, it should be about 0.15Ω
                  When checking voltages in the Primary, you must reference HOT Ground (C110 negative leg)
                  Thanks R_J for correcting me, long time i do not repair anything and getting old and forgetting ; Ac Line and Neutral =122v AC, Neutral and fuse=122v Ac, across filter Cap C110=169v Dc. Resistance across R113=0.4ohms, appreciate your help.I took all those voltages without Power supply being connected to main board and panel?
                  Last edited by ivtec; 07-10-2021, 12:17 PM.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9549
                      • Canada
                      #6
                      Re: LG Led TV 32LN5300UB Completely Dead

                      Are you sure you don't have 3.5v on the secondary side?

                        Comment

                        • ivtec
                          Badcaps Legend
                          • Dec 2008
                          • 1967
                          • USA
                          #7
                          Re: LG Led TV 32LN5300UB Completely Dead

                          Originally posted by R_J
                          Are you sure you don't have 3.5v on the secondary side?
                          hI R_J you are not believe it,i picked up this tv from the curve and it had no power cord ,but i had 3 cords in my scrap and took one to the cellar where i have the tv ,but the cord was bad ,the volts i gave you were taken with just power board connected with another cord ,i took this good cord to the celler and now when i connect the cord it goes to standby with red led ,when i power it up it gets a high loud sound from the tuner i guess, but with no display back light, and i tested volts going to the main i get the 3,5v, 12, 24v,i think the main board is bad!
                          Last edited by ivtec; 07-10-2021, 04:06 PM.

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