Pioneer PN50951-22U Backlight On, No Image

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  • x_orange90_x
    Badcaps Veteran
    • May 2015
    • 702
    • USA

    #1

    Pioneer PN50951-22U Backlight On, No Image

    I get backlights that stay on not there is no image. The tv does not automatically power on when plugged in either which I generally see happen when there is a fault. It responds as it should to the power button.

    I checked the test points on the TCON and I have proper voltages except for at 1P15V. I don't know if that is supposed to be 15V or 5V, but either way I only get 1.134V on that point. I have 12V, 8V, VCC, and a small amount on the CKV point.

    I tried heating up the SoC on the main board but that made no difference. Disconnecting either ribbon from the TCON also makes no difference.
    Attached Files
  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1306
    • United states

    #2
    Disconnect one ribbon from tcon to panel at a time and see if you get half image

    Comment

    • x_orange90_x
      Badcaps Veteran
      • May 2015
      • 702
      • USA

      #3
      Originally posted by EazyBone
      Disconnect one ribbon from tcon to panel at a time and see if you get half image
      That was the last thing I said in my post. No difference. I reseated the lvds ribbon too.

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4522
        • Russia

        #4
        I wonder where the supply voltages VGH, VGL, VCOM, AVDD are...

        Comment

        • lotas
          Badcaps Legend
          • Jan 2016
          • 4522
          • Russia

          #5
          At this test point there is 1.8v?
          1P15V - 1.15V
          Attached Files
          Last edited by lotas; 06-02-2024, 11:30 AM.

          Comment

          • x_orange90_x
            Badcaps Veteran
            • May 2015
            • 702
            • USA

            #6
            Originally posted by lotas
            At this test point there is 1.8v?
            1P15V - 1.15V
            1P15V - 1.123v
            ​​​12V - 12v
            VCC - 10.32v
            SCL -3.28v
            SDA - 3.27v
            CK2-TCON - 1.356v

            Those are the only labeled points I see besides TEST and that starts out negative mV and slowly rises into the positive mV.

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4522
              • Russia

              #7
              1P8V -- 1.8V ?
              Last edited by lotas; 06-02-2024, 12:22 PM.

              Comment

              • x_orange90_x
                Badcaps Veteran
                • May 2015
                • 702
                • USA

                #8
                Originally posted by lotas
                1P8V -- 1.8V ?
                Oh sorry. In my first post when I said 8v was 8v that was the point I meant. So 1P8V - 8v

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4522
                  • Russia

                  #9
                  Why 8v and not 1.8v.
                  3P3V - 3.3V
                  1P8V - 1.8V
                  1P15V - 1.15V​
                  Attached Files

                  Comment

                  • x_orange90_x
                    Badcaps Veteran
                    • May 2015
                    • 702
                    • USA

                    #10
                    Originally posted by lotas
                    Why 8v and not 1.8v.
                    3P3V - 3.3V
                    1P8V - 1.8V
                    1P15V - 1.15V​
                    I will recheck it.

                    Comment

                    • EazyBone
                      Badcaps Legend
                      • Jun 2023
                      • 1306
                      • United states

                      #11
                      Originally posted by x_orange90_x

                      That was the last thing I said in my post. No difference. I reseated the lvds ribbon too.
                      I see that now whoops, read differently.

                      Comment

                      • x_orange90_x
                        Badcaps Veteran
                        • May 2015
                        • 702
                        • USA

                        #12
                        Originally posted by lotas
                        Why 8v and not 1.8v.
                        3P3V - 3.3V
                        1P8V - 1.8V
                        1P15V - 1.15V​
                        3P3V - 3.25v
                        1P8V - 1.78v
                        1P15V - 1.14v

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4522
                          • Russia

                          #13
                          Originally posted by x_orange90_x

                          3P3V - 3.25v
                          1P8V - 1.78v
                          1P15V - 1.14v
                          Well, everything matches, now we need to get to the buffer strips and see what is soldered on them...

                          Comment

                          • x_orange90_x
                            Badcaps Veteran
                            • May 2015
                            • 702
                            • USA

                            #14
                            I noticed there's a buzzing that comes from the main board when the power is off but plugged in, and it turns into a lower hum when power is on. It comes from the lower part of the main.

                            Comment

                            • x_orange90_x
                              Badcaps Veteran
                              • May 2015
                              • 702
                              • USA

                              #15
                              Originally posted by lotas

                              Well, everything matches, now we need to get to the buffer strips and see what is soldered on them...
                              What would the chances be that something is wrong on ONE of them that causes both sides not to work, or something being wrong on BOTH sides? I get zero image on either side with TCON ribbons removed, alternately.

                              Comment

                              • lotas
                                Badcaps Legend
                                • Jan 2016
                                • 4522
                                • Russia

                                #16
                                Your second part of the t-con is soldered to the strip, where all the main voltages for powering the panel are formed.
                                Attached Files

                                Comment

                                • Diah
                                  Badcaps Legend
                                  • Feb 2013
                                  • 6355
                                  • Germany

                                  #17
                                  its is MB issue.. check after the soc low voltage id there TESTED OK--- WE HAVE IN THIS FORUM SAME ISSUE:: ::

                                  Comment

                                  • lotas
                                    Badcaps Legend
                                    • Jan 2016
                                    • 4522
                                    • Russia

                                    #18
                                    https://www.badcaps.net/forum/troubl...50951-22u-dead

                                    Comment

                                    • x_orange90_x
                                      Badcaps Veteran
                                      • May 2015
                                      • 702
                                      • USA

                                      #19
                                      I reviewed that thread before making my own post. I have backlights though so my issue is somewhat different I think. Nonetheless I'm still suspecting the main board. Is there anything I can/should check on the main?

                                      Comment

                                      • x_orange90_x
                                        Badcaps Veteran
                                        • May 2015
                                        • 702
                                        • USA

                                        #20
                                        Originally posted by lotas
                                        Your second part of the t-con is soldered to the strip, where all the main voltages for powering the panel are formed.
                                        I looked at the strips and see several more test points, but didn't see VGH, VGL, etc. I did see VCC however. I will recheck later today when I am home.

                                        Comment

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