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LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

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    LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

    Hello,

    My LED died while checking on PS-ON test not seeing any voltage.

    Here is result on PS-ON Pin 1 jump to Ping 9-10-11 or 12 (3.5V)

    23 - N.C -> 0V | 24 - ERROR -> 0V
    21 - 12V -> 0V | 22 - PWM -> 0V
    19 - 12V -> 0V | 20 - N.C -> 0V
    17 - 12V -> 0V | 18 - DRV-ON -> 0V
    15 - GND -> 0V | 16 - VSYNC -> 0V
    13 - GND -> 0V | 14 - GND -> 0V
    11 - 3.5V -> 3.52V | 12 - 3.5V -> 3.52V
    9 - 3.5V -> 3.52V | 10 - 3.5V -> 3.52V
    7 - GND -> 0V | 8 - GND -> 0V
    5 - GND -> 0V | 6 - GND -> 0V
    3 - 24V -> 0V | 4 - 24V -> 0V
    1 - PWR-ON -> 0V | 2 - 24V -> 0V
    Attached Files

    #2
    Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

    10 years or more LED LG old and now the reading of voltage not correct listed ..however i can tell one things.... you have back light issue

    Comment


      #3
      Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

      Originally posted by Diah View Post
      10 years or more LED LG old and now the reading of voltage not correct listed ..however i can tell one things.... you have back light issue
      I disconnected backlight cables and tried PSU test still no voltages
      if I put 201 cable to board relay keep turning on off and voltage comes and go

      Comment


        #4
        Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

        LW series has BGA failures. Search ebay for repair services.

        Comment


          #5
          Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

          Originally posted by neilc6 View Post
          LW series has BGA failures. Search ebay for repair services.
          BGA is on mainboard not on PSU, I need to fix PSU voltages before going into Mainboard, also shipping board to China will cost more than LCD price instead I can install Universal Android board but for that I still need PSU FIX and have backlights working

          Comment


            #6
            Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

            Originally posted by mohsinrizwan View Post
            Hello,

            My LED died while checking on PS-ON test not seeing any voltage.

            Here is result on PS-ON Pin 1 jump to Ping 9-10-11 or 12 (3.5V)

            23 - N.C -> 0V | 24 - ERROR -> 0V
            21 - 12V -> 0V | 22 - PWM -> 0V
            19 - 12V -> 0V | 20 - N.C -> 0V
            17 - 12V -> 0V | 18 - DRV-ON -> 0V
            15 - GND -> 0V | 16 - VSYNC -> 0V
            13 - GND -> 0V | 14 - GND -> 0V
            11 - 3.5V -> 3.52V | 12 - 3.5V -> 3.52V
            9 - 3.5V -> 3.52V | 10 - 3.5V -> 3.52V
            7 - GND -> 0V | 8 - GND -> 0V
            5 - GND -> 0V | 6 - GND -> 0V
            3 - 24V -> 0V | 4 - 24V -> 0V
            1 - PWR-ON -> 0V | 2 - 24V -> 0V
            If you jump PWR-ON to 3.52V STBY, why does it show PWR-ON = 0V?
            When you jump it, did you disconnect the cable from the power supply to the main board first? If you did not you can damage the switched Transistor on the main board.
            You should always use the resistor to force on the board, in this case you can use 100 ~ 500 Ohms resistor.
            Last edited by budm; 08-02-2020, 09:55 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


              #7
              Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

              Originally posted by budm View Post
              If you jump PWR-ON to 3.52V STBY, why does it show PWR-ON = 0V?
              When you jump it, did you disconnect the cable from the power supply to the main board first? If you did not you can damage the switched Transistor on the main board.
              You should always use the resistor to force on the board, in this case you can use 100 ~ 500 Ohms resistor.
              My apologies yes PS-ON had 3.5V it was my typo. and yes I did disconnected cable from main board and used resistor to jump PS-ON to 3.5V

              only voltages I am getting is 3.5V on Pins 9-12 (and get 3.5V on PS-ON when jumped)

              Comment


                #8
                Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                Originally posted by mohsinrizwan View Post
                My apologies yes PS-ON had 3.5V it was my typo. and yes I did disconnected cable from main board and used resistor to jump PS-ON to 3.5V

                only voltages I am getting is 3.5V on Pins 9-12 (and get 3.5V on PS-ON when jumped)
                OK.
                So if you run the power supply board by itself, you jump the PS-ON pin but the switched 12V/24V still do not come on, we need then to find out if the PFC Voltage booster is working or not next.
                Please check the Voltage between the two legs of the main filter caps (the three of them with 450V rating), they should have about 380 ~400VDC when you jump the PS-ON.
                BTW, there are 3 fuses (1 for ac, 1(with two dark color bands) for 12V/24V power supply, 1 for standby power supply. Is the one for 12V/24V OK?
                Last edited by budm; 08-02-2020, 10:37 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


                  #9
                  Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                  all three caps has 275V and fuse it fine

                  Comment


                    #10
                    Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                    Originally posted by mohsinrizwan View Post
                    all three caps has 275V and fuse it fine
                    That is very low.
                    What is your AC line Voltage, 230V? If it is 230V you should have about 325V when not force on, about 380 ~ 400V when forced on.
                    Are you sure you're only getting 275Vdc?
                    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


                      #11
                      Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                      yes its 275V (sometimes it goes to 278/285) and yes I am on 230V
                      with force off I am getting same 275V

                      Comment


                        #12
                        Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                        Originally posted by mohsinrizwan View Post
                        yes its 275V (sometimes it goes to 278/285) and yes I am on 230V
                        with force off I am getting same 275V
                        275VDC on the main caps is not right all.
                        Can I see good clear straight shots of the whole bottom side of the power supply board?
                        BTW, do you hear the power relay clicks on when you apply the force on (jump)?
                        Last edited by budm; 08-02-2020, 11:44 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


                          #13
                          Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                          attached
                          Attached Files

                          Comment


                            #14
                            Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                            Originally posted by budm View Post
                            275VDC on the main caps is not right all.
                            Can I see good clear straight shots of the whole bottom side of the power supply board?
                            BTW, do you hear the power relay clicks on when you apply the force on (jump)?
                            forget to mention relay click, yes I do hear relay click sound and I verified rectified has same 275-278VDC with force on

                            Comment


                              #15
                              Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                              https://www.badcaps.net/forum/attach...8&d=1596433739
                              I only see Black probe on Neg. leg of the cap. Where did you put the red probe at?
                              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


                                #16
                                Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                                https://www.badcaps.net/forum/attach...9&d=1596433739
                                I need straight shots pictures of the board, not in angle like that, because I need to be able to trace out the traces on the board to see what is going on.
                                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


                                  #17
                                  Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                                  I put red prob on positive of cap

                                  I hope these pictures are usefull
                                  Attached Files

                                  Comment


                                    #18
                                    Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                                    Originally posted by mohsinrizwan View Post
                                    I put red prob on positive of cap

                                    I hope these pictures are usefull
                                    Are you sure the meter is good on 1000V scale?
                                    The pictures are much better but can you show the whole board, it is hard for me to trace out the circuit without seeing the whole board.
                                    Last edited by budm; 08-03-2020, 01:47 AM.
                                    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


                                      #19
                                      Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                                      BTW, check the AC Voltage on the two inner legs of the bridge rectifier to see what you get.
                                      It's 1:40 AM my time here so I will have to do follow up tomorrow, may be some one will look over also and help you out. Good night.
                                      Last edited by budm; 08-03-2020, 02:42 AM.
                                      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


                                        #20
                                        Re: LG TV 47LW5500 does not power on (PSU EAX62865401/Main board EAX64405501)

                                        sorry I went to sleep, i'll post whole board pic shortly.

                                        Bridge rectifier had 220V in inner legs, that was first thing I checked after relay click.
                                        i'l measure reading again with different meter.

                                        Comment

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