Lg 32ln530b-ua

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  • knightdad
    Senior Member
    • Apr 2015
    • 54
    • usa

    #21
    Re: Lg 32ln530b-ua

    yes 12 volts is there before jump
    an yes
    ground to cold side chassis

    Comment

    • knightdad
      Senior Member
      • Apr 2015
      • 54
      • usa

      #22
      Re: Lg 32ln530b-ua

      making sense now

      Comment

      • newtothis
        Badcaps Legend
        • Mar 2013
        • 1556
        • england

        #23
        Re: Lg 32ln530b-ua

        Not really, It is not you or your posts as such.

        The thing that is confusing me is that for you to get the 12v then the 24v should be present.. You shouldn't be able to get one without the other as the switching circuit uses both.

        Seems to me as if something may be shorted closed somewhere.

        budm is the one to trace circuits so will leave him to this.

        Good luck

        Comment

        • knightdad
          Senior Member
          • Apr 2015
          • 54
          • usa

          #24
          Re: Lg 32ln530b-ua

          lol same here thanks for trying

          Comment

          • knightdad
            Senior Member
            • Apr 2015
            • 54
            • usa

            #25
            Re: Lg 32ln530b-ua

            test q201
            the middle leg is not used
            red left leg black right leg =112
            red on middle leg black on right=short or closed
            black on left leg red on right=112
            black on middle leg red on right=short or closed
            the middle leg is not attached its clip off so

            now test with black on top or where it solder to borad
            black to point on top of borad red left leg =112
            black to point on top of borad red middle leg=short or closed
            black to point on top of borad red right leg= short or closed
            red to point on top of borad wher it is solder to black to left leg=116
            red to point on top of borad wher it is solder to black to middle leg=short or closed
            red to point on top of borad wher it is solder to black to right leg= short or closed

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Lg 32ln530b-ua

              The middle leg is connected internally to the big tab which is Drain pin, looking at it with big tab up: left pin is Gate, Middle/tab is Drain, Right pin is Source.
              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

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Lg 32ln530b-ua

                OK, your readings do not make sense to me based on what I see on the board.
                You need to check the Voltages on the two legs of those filter caps for 24V feeding the S pin, output at the D pin.
                This is the best I can do from looking at the pictures of the board.
                Attached Files
                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

                • knightdad
                  Senior Member
                  • Apr 2015
                  • 54
                  • usa

                  #28
                  Re: Lg 32ln530b-ua

                  ok the caps feeding the s pin in not there an same with output to d pin

                  well some volts are there it reads for an sec then zero
                  the test from early was without power on dioide mode

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Lg 32ln530b-ua

                    Originally posted by knightdad
                    ok the caps feeding the s pin in not there an same with output to d pin

                    well some volts are there it reads for an sec then zero
                    the test from early was without power on dioide mode
                    But you still have 12V at the 12V output pins?

                    Without power on, do mean TV is not plugged into the outlet?
                    Are you using the Chassis for the black probe and the board is not mounted to the chassis?
                    Last edited by budm; 04-29-2015, 11:00 PM.
                    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

                    • knightdad
                      Senior Member
                      • Apr 2015
                      • 54
                      • usa

                      #30
                      Re: Lg 32ln530b-ua

                      board is out of tv
                      i get 3.5 12 an 70 for back light no 24
                      black probe is on cold side ground
                      useing an klein mm100 meter

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Lg 32ln530b-ua

                        It does not make sense to me for not having 24V at the 24V output pins and 0 Volt on the D pin with force on resistor applied.
                        Please get the P/N of the IC for the 12V Buck converter.
                        Also do the resistance test between the D pin of the MOSFET and ALL 8 legs of the 12V Buck converter IC to verify that the MOSFET is in deed feeding the Voltage to the IC to create 12V.
                        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

                        • knightdad
                          Senior Member
                          • Apr 2015
                          • 54
                          • usa

                          #32
                          Re: Lg 32ln530b-ua

                          ok will do when i get home tonight thanks for the help

                          Comment

                          • knightdad
                            Senior Member
                            • Apr 2015
                            • 54
                            • usa

                            #33
                            Re: Lg 32ln530b-ua

                            nr8910
                            sk 412
                            926t
                            is what is on the ic202
                            black on drain tab an red on pins I get this
                            3.83 3.56 9.33 3.59
                            1 1 1 1

                            1 1 1 1
                            1.29 2.20 0.00 open
                            from back side of pb
                            an when I plug this pb with nothing plug in or jump I get 12 volts an 3.5
                            I thought that is should only have 3.5 until ps to trun on

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #34
                              Re: Lg 32ln530b-ua

                              I think it is NR891D.
                              So far I cannot find the pin out or spec sheet for it.
                              http://www.aliexpress.com/store/prod...851702653.html
                              I really do not expect the 12VDC to be present until PS-ON is applied, so I am not really sure what is going on yet.
                              But is does look like one pin is connected to the D pin of the MOSFET.
                              Last edited by budm; 04-30-2015, 06:53 PM.
                              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

                              • knightdad
                                Senior Member
                                • Apr 2015
                                • 54
                                • usa

                                #35
                                Re: Lg 32ln530b-ua

                                yes it is d

                                Comment

                                • knightdad
                                  Senior Member
                                  • Apr 2015
                                  • 54
                                  • usa

                                  #36
                                  Re: Lg 32ln530b-ua

                                  well more info if this help i bought an pb from ebay an main from shop jimmy
                                  the pb i got from ebay does the same thing when i got this tv it had no stand by led so i frist said ok pb so order one put it in an same thing no light so look at it more close the 3.5 goes there the main so i said maybe main is bad lol order one from shop jimmy
                                  nope still same thing no led stand by but it has volts going to it then i said hmm lets try here at badcaps an now we are here i am no expert but can do more then the averge joe lol i have fix coultless tvs an this one has got me down

                                  Comment

                                  • knightdad
                                    Senior Member
                                    • Apr 2015
                                    • 54
                                    • usa

                                    #37
                                    Re: Lg 32ln530b-ua

                                    well i have try everything so far no luck going to get an new pb an see

                                    Comment

                                    • newtothis
                                      Badcaps Legend
                                      • Mar 2013
                                      • 1556
                                      • england

                                      #38
                                      Re: Lg 32ln530b-ua

                                      Ok so ALL PS boards you have tried are giving 12v out before power up?

                                      Comment

                                      • knightdad
                                        Senior Member
                                        • Apr 2015
                                        • 54
                                        • usa

                                        #39
                                        Re: Lg 32ln530b-ua

                                        so far i both of them i got does
                                        one in unit an one bought off ebay from open boxes usa
                                        yes

                                        Comment

                                        • knightdad
                                          Senior Member
                                          • Apr 2015
                                          • 54
                                          • usa

                                          #40
                                          Re: Lg 32ln530b-ua

                                          thanks for the help
                                          i will report back after i get the new pb an let yall know what happens

                                          Badcaps is the place THANKS FOR THE HELP

                                          Comment

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