LG 55B6P OLED No image/sound

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  • Diah
    Badcaps Legend
    • Feb 2013
    • 6346
    • Germany

    #21
    Re: LG 55B6P OLED No image/sound

    yes so now we have the micon reset complete.
    now turn it on and check on USB 1 2 3 do you have 5V?

    Comment

    • blkrx7
      Member
      • Oct 2019
      • 24
      • Canada

      #22
      Re: LG 55B6P OLED No image/sound

      Turned on
      0v on USB 1, 2, 3

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6346
        • Germany

        #23
        Re: LG 55B6P OLED No image/sound

        okay... you need to check on the socket P2500 wich come from PWB pin 3 4 5 6 had 24V or less

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6346
          • Germany

          #24
          Re: LG 55B6P OLED No image/sound

          also locate IC2305 (DC to DC )on MB and shoot clear photo of it and round parts such IC4301 IC4400

          Comment

          • blkrx7
            Member
            • Oct 2019
            • 24
            • Canada

            #25
            Re: LG 55B6P OLED No image/sound

            P2500
            24.56 on Pins 3, 4, 5, 6

            New IC's attached
            Attached Files

            Comment

            • Diah
              Badcaps Legend
              • Feb 2013
              • 6346
              • Germany

              #26
              Re: LG 55B6P OLED No image/sound

              so if you check IC4301 IC4400 pins could u find 5V ?

              Comment

              • blkrx7
                Member
                • Oct 2019
                • 24
                • Canada

                #27
                Re: LG 55B6P OLED No image/sound

                IC4301
                IC4400
                1 -> 5v
                2 -> 0v
                3 -> 0v
                4 -> 3.3v
                5 -> 0v
                6 -> 0v


                IC2305
                15,16,17 -> 12v
                18 -> 0v

                These aren't easy to measure, if something looks way out, yell.

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6346
                  • Germany

                  #28
                  Re: LG 55B6P OLED No image/sound

                  so 2305 working..
                  now i want you to remove the socket on the T-CON driver which it come from PWB 24V socket.. turn on and give notice on Audio optic lit red or not... give time 1 minute

                  Comment

                  • blkrx7
                    Member
                    • Oct 2019
                    • 24
                    • Canada

                    #29
                    Re: LG 55B6P OLED No image/sound

                    Unplugged from wall
                    Removed P202 from Power supply
                    Plugged into wall
                    Turned on
                    Waited 1m

                    No Optic LED light

                    Comment

                    • blkrx7
                      Member
                      • Oct 2019
                      • 24
                      • Canada

                      #30
                      Re: LG 55B6P OLED No image/sound

                      Strange, usually I get 1v on the 24v rail (measured on power supply).

                      When 202 is unplugged, I get 0v

                      The fuse on the tcon (measured good) reads 1v on either side. I presumed it was the power supply sending that 1v, but it seems like it's being backfed somewhere on the tcon.

                      Comment

                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6346
                        • Germany

                        #31
                        Re: LG 55B6P OLED No image/sound

                        sure if 202 unplugged you will get 0V on t-con side but 24 on PWB
                        and if its plugged how much it read on T-CON side?
                        Last edited by Diah; 09-25-2020, 03:26 PM.

                        Comment

                        • blkrx7
                          Member
                          • Oct 2019
                          • 24
                          • Canada

                          #32
                          Re: LG 55B6P OLED No image/sound

                          1v

                          202 unplugged
                          Power supply output pin 0v
                          Tcon power input pin 1v

                          202 plugged
                          Power supply output pin 1v
                          Tcon power input pin 1v

                          The 1v is coming from the tcon. May not be relevant but surprises me to see any voltage on that pin at all while it's unplugged.

                          It's actually 1.336v, very strong, very consistent.

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6346
                            • Germany

                            #33
                            Re: LG 55B6P OLED No image/sound

                            the main boards didn't sent signal to turn on the panel 24v rallies on PWB.

                            Comment

                            • blkrx7
                              Member
                              • Oct 2019
                              • 24
                              • Canada

                              #34
                              Re: LG 55B6P OLED No image/sound

                              Yep, I can bridge the P201 pins 24 (drv_on) & 17 (stby) and confirmed the power supply outputs 24v (tcon/mb unplugged from power supply).

                              That signal is not getting sent from the mainboard.

                              Would you like me to bridge it while it's connected to the mainboard/tcon?

                              Comment

                              • Diah
                                Badcaps Legend
                                • Feb 2013
                                • 6346
                                • Germany

                                #35
                                Re: LG 55B6P OLED No image/sound

                                can you show the pins print label of the sockets which goes from PWB to MB?

                                Comment

                                • blkrx7
                                  Member
                                  • Oct 2019
                                  • 24
                                  • Canada

                                  #36
                                  Re: LG 55B6P OLED No image/sound

                                  See attached
                                  Attached Files

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6346
                                    • Germany

                                    #37
                                    Re: LG 55B6P OLED No image/sound

                                    Originally posted by blkrx7
                                    Yep, I can bridge the P201 pins 24 (drv_on) & 17 (stby) and confirmed the power supply outputs 24v (tcon/mb unplugged from power supply).

                                    That signal is not getting sent from the mainboard.

                                    Would you like me to bridge it while it's connected to the mainboard/tcon?
                                    you can do it but only in this way... if pin 24 are drv_on trace the cable of it which it come from MB.. cut it in the middle then bridge pin 24 with stb put back socket 202.. and turn on and put your eyes on the screen and the audio optic if its turn red

                                    BTW: of course we are talking on the bridge only at PWB side
                                    Last edited by Diah; 09-25-2020, 03:51 PM.

                                    Comment

                                    • blkrx7
                                      Member
                                      • Oct 2019
                                      • 24
                                      • Canada

                                      #38
                                      Re: LG 55B6P OLED No image/sound

                                      Unplugged
                                      I removed pin 24 completely from p202, so it would not connect to power supply.
                                      Jumped 24/17 on the power supply
                                      Plugged in
                                      Turned on

                                      I have 24v at the tcon now
                                      No optic LED or anything on the display

                                      Comment

                                      • Diah
                                        Badcaps Legend
                                        • Feb 2013
                                        • 6346
                                        • Germany

                                        #39
                                        Re: LG 55B6P OLED No image/sound

                                        screen black? play your PC hdmi

                                        Comment

                                        • blkrx7
                                          Member
                                          • Oct 2019
                                          • 24
                                          • Canada

                                          #40
                                          Re: LG 55B6P OLED No image/sound

                                          Laptop plugged back in, still nothing on the display, no voltage at usb.

                                          Laptop still reports back it's plugged into an LG display.

                                          Comment

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