Samsung 50AU7172, only blinking red light

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  • norbiszoke
    Member
    • May 2015
    • 18
    • Serbia

    #1

    Samsung 50AU7172, only blinking red light

    Hello,

    We have this set here in our shop that is not ginving sign of life besides red light that is blinking one time after pressing the button and nothing more... After detaching the mainboard from the PSU (this set has separate board thank god?! or not...) the backlight comes on. After reattaching nothing besides red light.... Can anyone from the forum help me here? Thank you in advance. Here's a link with images of the mainboard and the memory IC's that are on it.


    Regards, Norbert!
    Attached Files
  • EazyBone
    Badcaps Legend
    • Jun 2023
    • 1320
    • United states

    #2
    Well sounds like BL and PSU to BL works. Should start measuring voltages from PSU to main and make sure they all present. Plus a picture of psu legend. Samsungs generally have a blink code, so how many blinks is red light doing.

    Comment

    • norbiszoke
      Member
      • May 2015
      • 18
      • Serbia

      #3
      Originally posted by EazyBone
      Well sounds like BL and PSU to BL works. Should start measuring voltages from PSU to main and make sure they all present. Plus a picture of psu legend. Samsungs generally have a blink code, so how many blinks is red light doing.
      The red light blinks one time. At the other post where the MU series is discussed there was a post that the boot in one of the SPI chips is bad and thats when the one blink is occuring. But will measure the voltages in a sec.

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4577
        • Russia

        #4
        Check this area, it looks like moisture has entered, check the HDMI and usb input lines for short and low resistance to ground, put a jumper and disconnect the lvds cable and check for startup without a panel.

        In the MU series, if the spi firmware fails, then the TV is completely dead and the standby indicator does not even light up.​
        Attached Files

        Comment

        • norbiszoke
          Member
          • May 2015
          • 18
          • Serbia

          #5
          Originally posted by lotas
          Check this area, it looks like moisture has entered, check the HDMI and usb input lines for short and low resistance to ground, put a jumper and disconnect the lvds cable and check for startup without a panel.

          In the MU series, if the spi firmware fails, then the TV is completely dead and the standby indicator does not even light up.​
          That are is just typical dust from carpet. I cleaned it up. The 13V from PSU and 3.3V standby are present on the board. The 3.3V is there to the 24c512 and the 25q40. The 1.8V and 3.3V are also there at the EMMC. Thre is no short on the USB and the HDMI inputs.

          Comment

          • norbiszoke
            Member
            • May 2015
            • 18
            • Serbia

            #6
            Originally posted by lotas
            Check this area, it looks like moisture has entered, check the HDMI and usb input lines for short and low resistance to ground, put a jumper and disconnect the lvds cable and check for startup without a panel.

            In the MU series, if the spi firmware fails, then the TV is completely dead and the standby indicator does not even light up.​
            What do you mean by putting a jumper? I disconnected the LVDS connector but still the same simptop.

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4577
              • Russia

              #7
              Originally posted by norbiszoke

              What do you mean by putting a jumper? I disconnected the LVDS connector but still the same simptop.
              About this jumper.
              Attached Files

              Comment

              • norbiszoke
                Member
                • May 2015
                • 18
                • Serbia

                #8
                Originally posted by lotas

                About this jumper.
                Shorted those 2 pins with the LVDS cable out, but still one blink and nothing else happens.

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4577
                  • Russia

                  #9
                  So what diagonal do you have, 50 or 55? What is the panel number? There is a programmer, read all the dumps (3 pieces) ic503, ic501 and ic502 and post them here.
                  Attached Files

                  Comment

                  • norbiszoke
                    Member
                    • May 2015
                    • 18
                    • Serbia

                    #10
                    Originally posted by lotas
                    So what diagonal do you have, 50 or 55? What is the panel number? There is a programmer, read all the dumps (3 pieces) ic503, ic501 and ic502 and post them here.
                    The TV is a 50" one. Here is the panel number and the number from the backside of the set.
                    Attached Files

                    Comment

                    • norbiszoke
                      Member
                      • May 2015
                      • 18
                      • Serbia

                      #11
                      Originally posted by lotas
                      So what diagonal do you have, 50 or 55? What is the panel number? There is a programmer, read all the dumps (3 pieces) ic503, ic501 and ic502 and post them here.
                      I can read all 3 of them. I have an RT809H programmer.

                      Comment

                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6362
                        • Germany

                        #12
                        the main boards photo you posted it belong to 55 size.... the 50 as the lable on the back should be the mainboards with this lable

                        Click image for larger version

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                        Comment

                        • norbiszoke
                          Member
                          • May 2015
                          • 18
                          • Serbia

                          #13
                          Originally posted by Diah
                          the main boards photo you posted it belong to 55 size.... the 50 as the lable on the back should be the mainboards with this lable

                          Click image for larger version

Name:	s-l1600.png
Views:	136
Size:	166.0 KB
ID:	3254549
                          I get what you mean, the mainboard was not changed by us, maybe by warranty service or someone else changed the board before us.

                          Comment

                          • norbiszoke
                            Member
                            • May 2015
                            • 18
                            • Serbia

                            #14
                            Originally posted by norbiszoke

                            The TV is a 50" one. Here is the panel number and the number from the backside of the set.

                            Originally posted by lotas
                            So what diagonal do you have, 50 or 55? What is the panel number? There is a programmer, read all the dumps (3 pieces) ic503, ic501 and ic502 and post them here.




                            Here are the contents from the IC's 501-502-503. And sorry for taking up your time.
                            Attached Files

                            Comment

                            • Diah
                              Badcaps Legend
                              • Feb 2013
                              • 6362
                              • Germany

                              #15
                              Originally posted by norbiszoke

                              I get what you mean, the mainboard was not changed by us, maybe by warranty service or someone else changed the board before us.
                              warranty service will never replace 55 in 50.. no reason.... the questions have you ever seen this SET working !?.

                              Comment

                              • norbiszoke
                                Member
                                • May 2015
                                • 18
                                • Serbia

                                #16
                                Originally posted by Diah

                                warranty service will never replace 55 in 50.. no reason.... the questions have you ever seen this SET working !?.
                                No I have not, it came to our shop like this. You can never know what happens here in Serbia.

                                Comment

                                • EazyBone
                                  Badcaps Legend
                                  • Jun 2023
                                  • 1320
                                  • United states

                                  #17
                                  Originally posted by Diah

                                  warranty service will never replace 55 in 50.. no reason.... the questions have you ever seen this SET working !?.
                                  I literally had warranty service replace 50 in MB like 2-3 weeks ago. The warranty guy came with a new panel and new MB/PSU combo. Tried panel, wasn't it and replaced the MB. Maybe in USA they will do smaller tv

                                  Comment

                                  • lotas
                                    Badcaps Legend
                                    • Jan 2016
                                    • 4577
                                    • Russia

                                    #18
                                    Try experimenting with these dumps, dump, ic501 is very different.
                                    Attached Files

                                    Comment

                                    • norbiszoke
                                      Member
                                      • May 2015
                                      • 18
                                      • Serbia

                                      #19
                                      Originally posted by lotas
                                      Try experimenting with these dumps, dump, ic501 is very different.
                                      Will try tomorrow morning.

                                      Comment

                                      • Diah
                                        Badcaps Legend
                                        • Feb 2013
                                        • 6362
                                        • Germany

                                        #20
                                        Originally posted by EazyBone

                                        I literally had warranty service replace 50 in MB like 2-3 weeks ago. The warranty guy came with a new panel and new MB/PSU combo. Tried panel, wasn't it and replaced the MB. Maybe in USA they will do smaller tv
                                        not good enough this worker... he forget to bring with the RC and the main cord

                                        Comment

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