lg 42pt85 no power standby lights up

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #21
    Re: lg 42pt85 no power standby lights up

    tom I don't have acess to her camera atm as she got it packed away for her holiday

    the diodees though they shouldn't have continuity

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: lg 42pt85 no power standby lights up

      Depends on the diode - outer two pins can be connected together on some designs. Part # of diodes?
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #23
        Re: lg 42pt85 no power standby lights up

        right tom pictures as requested







        tom this board is a YPSU-J014A REV 2.5

        I HAVE A SMALL IDEA DUNNO IF YOU WILL AGREE OR NOT
        I HAVE A WORKING PSU OUT OF THAT 42PX5D

        CAN I WIRE THAT UP SO ALL CONNECTIONS ARE WIRED THE SAME WILL IT WORK

        BECASU IN THEORY VS IS VS AND VA IS VA ETC

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: lg 42pt85 no power standby lights up

          Well, if and only if all the connections are identical.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • wreksta
            Badcaps Veteran
            • Aug 2013
            • 508
            • england

            #25
            Re: lg 42pt85 no power standby lights up

            I don't think they have same connectors but I can fathom al that out so the right connections go to the right connections#

            anyways have the pictures helped mate I would like to try and repair this board tbh

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: lg 42pt85 no power standby lights up

              Part # on the "shorted" diode?
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • wreksta
                Badcaps Veteran
                • Aug 2013
                • 508
                • england

                #27
                Re: lg 42pt85 no power standby lights up

                tom all thee parts show continuity

                theres a mosfet marked
                D612 ,D614

                THEN THERES
                DIODES
                D151
                D804

                RESISTORS
                R153
                R154
                R157
                R802
                R806
                R861

                THEN THERES A BIG DIODE LOOKING TYPE

                MARKED EL63

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: lg 42pt85 no power standby lights up

                  Part # as written on the device not the board.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • wreksta
                    Badcaps Veteran
                    • Aug 2013
                    • 508
                    • england

                    #29
                    Re: lg 42pt85 no power standby lights up

                    tom can I not just remove the parts to find out if there shorted esp the diodes
                    parts are tiny so hard to get numbers

                    the mosfet type one d612,d614 is s20lc60us

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: lg 42pt85 no power standby lights up

                      You can, but it's a lot more work than using a bright light and magnifying glass to read them. Or the macro mode on a camera + flash.

                      Those are probably TO220 type, not MOSFETs but in same package.
                      http://www.shindengen.co.jp/product_...20LC60US&id=81

                      You can see internal circuit, pins 1 and 3 are different diodes. On the board they will probably be joined together.
                      Last edited by tom66; 09-23-2013, 05:05 AM.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                      • wreksta
                        Badcaps Veteran
                        • Aug 2013
                        • 508
                        • england

                        #31
                        Re: lg 42pt85 no power standby lights up

                        that's what I thought tom

                        so what about removing just those 2 diodes and testing them off board they should not be shorted off the board

                        Comment

                        • wreksta
                          Badcaps Veteran
                          • Aug 2013
                          • 508
                          • england

                          #32
                          Re: lg 42pt85 no power standby lights up

                          tom just read through this thread

                          https://www.badcaps.net/forum/showth...ght=gtv&page=2

                          this fault is like mine
                          im going to check mosfets mate

                          will post all results soon

                          Comment

                          • wreksta
                            Badcaps Veteran
                            • Aug 2013
                            • 508
                            • england

                            #33
                            Re: lg 42pt85 no power standby lights up

                            ....................

                            Comment

                            • wreksta
                              Badcaps Veteran
                              • Aug 2013
                              • 508
                              • england

                              #34
                              Re: lg 42pt85 no power standby lights up

                              this power board was replaced for a working one andnow tv wont fire up unless y main connector is disconnected then the standby light goes green and hard drive spins into lifeand tv stays on
                              but the thing is the xmain gets its power from the ymain ive checked fuses on both x and y any ideas

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: lg 42pt85 no power standby lights up

                                Check from Vs to GND on Z-sus and Y-sus.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • wreksta
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 508
                                  • england

                                  #36
                                  Re: lg 42pt85 no power standby lights up

                                  please explain that mate you lost me

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #37
                                    Re: lg 42pt85 no power standby lights up

                                    Resistance check - 200 ohm range or so. Readings around 0 ohms are bad.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • wreksta
                                      Badcaps Veteran
                                      • Aug 2013
                                      • 508
                                      • england

                                      #38
                                      Re: lg 42pt85 no power standby lights up

                                      so red in on vs and black on ground and meter on 200 ohms
                                      do I test this on psu or the yboard or does it not matter

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: lg 42pt85 no power standby lights up

                                        You want to test on each of the suspect boards - Y-sus and Z-sus.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

                                        • wreksta
                                          Badcaps Veteran
                                          • Aug 2013
                                          • 508
                                          • england

                                          #40
                                          Re: lg 42pt85 no power standby lights up

                                          right tom jesus just removed x z board and the big black coil has burn marks underneath and on the pad it sits on
                                          I disconnected the x from the y but I don't think the model will fire without both connected

                                          going to have to replace this board before I can do anything mate

                                          Comment

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