DP50747 Question

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  • ad1982
    Member
    • Dec 2013
    • 21
    • USA

    #1

    DP50747 Question

    I had a question about a dp50747-01 Sanyp plasma TV. I'm getting the typical "powers on then relay clicks and it shuts off". I replaced 9 bad caps on the power supply board that now I get a brief flash of the screen before it shuts right back off...it didn't do that before. I'm looking at the 4 led lights on the logic board and am not sure what they mean. They are labeled as D2 through D5. When I initially power it on, they all light up, then all go out but D2. After a few seconds along with the relay that clicks and it powers off, D2 goes out too. I get these symptoms over and over. Any insight?
  • ad1982
    Member
    • Dec 2013
    • 21
    • USA

    #2
    Re: DP50747 Question

    A quick update to this as I had a couple of details wrong before...it is D3 through D5 that light up and go out, D2 is never lit. Does anyone know what D2 represents?

    Also, I've tested the power supply, Vs is getting the correct voltage, but I'm not getting anything on Va at all. I'm still getting a slight flash of the screen each and every time I try powering on. Any suggestions? I appreciate the help!

    Comment

    • newtothis
      Badcaps Legend
      • Mar 2013
      • 1556
      • england

      #3
      Re: DP50747 Question

      Ok have a DMM?

      Comment

      • ad1982
        Member
        • Dec 2013
        • 21
        • USA

        #4
        Re: DP50747 Question

        No, I only have access to an analog one at the moment. Is there any simple testing I can do with it until I can get ahold of a digital one? Curious what it means when you don't get any reading off of the Va.

        Comment

        • newtothis
          Badcaps Legend
          • Mar 2013
          • 1556
          • england

          #5
          Re: DP50747 Question

          Sorry time of night, obviously as you have checked voltages already... < not so obvious!

          Voltages at K7H and K7J on PSU?

          Comment

          • ad1982
            Member
            • Dec 2013
            • 21
            • USA

            #6
            Re: DP50747 Question

            Let me look around on the board, do you know where abouts I might find these points? Will it be a pin or on a diode or something?

            Totally appreciate the help!

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england

              #7
              Re: DP50747 Question

              Connector from filter board, Throw some pics of the boards and chassis and I will point them out if needed

              Comment

              • ad1982
                Member
                • Dec 2013
                • 21
                • USA

                #8
                Re: DP50747 Question

                Here's a picture of the board, I see the points you're talking about, but there are no connectors in place there.
                Attached Files

                Comment

                • newtothis
                  Badcaps Legend
                  • Mar 2013
                  • 1556
                  • england

                  #9
                  Re: DP50747 Question

                  Different revision of board.

                  Ok lets test voltages on main board for the Power Fail Circuits...

                  Picture of main board

                  Comment

                  • ad1982
                    Member
                    • Dec 2013
                    • 21
                    • USA

                    #10
                    Re: DP50747 Question

                    OK, here are a few pictures that may help. I currently have the power board still mounted, let me know if you need me to get a picture of the full board.
                    Attached Files

                    Comment

                    • newtothis
                      Badcaps Legend
                      • Mar 2013
                      • 1556
                      • england

                      #11
                      Re: DP50747 Question

                      Very hard to see with these pics.

                      Need them clearer so we can see reference printing on the boards... so good high resolution with good focus.

                      Comment

                      • newtothis
                        Badcaps Legend
                        • Mar 2013
                        • 1556
                        • england

                        #12
                        Re: DP50747 Question

                        Its 5 am here and Mrs is moaning about the time so look over these....
                        Attached Files

                        Comment

                        • ad1982
                          Member
                          • Dec 2013
                          • 21
                          • USA

                          #13
                          Re: DP50747 Question

                          Sorry about that, would this one help?
                          Attached Files

                          Comment

                          • ad1982
                            Member
                            • Dec 2013
                            • 21
                            • USA

                            #14
                            Re: DP50747 Question

                            Here's pics of the Ysus, Zsus & the left portion of the power supply board (since it's still mounted in the TV).
                            Attached Files

                            Comment

                            • ad1982
                              Member
                              • Dec 2013
                              • 21
                              • USA

                              #15
                              Re: DP50747 Question

                              Thanks for the reference manual, it looks like I'm getting 5 volts at pin 32 and nothing at pin 36 (if I'm reading that right that I'm supposed to be testing 36 too).

                              Comment

                              • newtothis
                                Badcaps Legend
                                • Mar 2013
                                • 1556
                                • england

                                #16
                                Re: DP50747 Question

                                Which connector?

                                Comment

                                • ad1982
                                  Member
                                  • Dec 2013
                                  • 21
                                  • USA

                                  #17
                                  Re: DP50747 Question

                                  OK, I tested all of the points that were referred to in that manual you sent me, and the only 2 things that didn't come back correct were the pin 36 on the IC801 CPU (pin 32 was correct, and I'm not sure if I was supposed to get a reading on pin 36) and also the D1621 on IC1620 is coming back at about 7 volts (instead of 33v). These were all tests on the Power Failure Circuit page. I did notice that there was no chip in the D1683 spot (on K8B at 12V) but I did measure the little solder pad that was in its place and got about 5 volts (the manual said I should be getting 12V).

                                  I believe I'm testing these right...black lead on ground and red lead on the chip's solder point, like D1621.

                                  Comment

                                  • newtothis
                                    Badcaps Legend
                                    • Mar 2013
                                    • 1556
                                    • england

                                    #18
                                    Re: DP50747 Question

                                    Will take a look through when I get back later

                                    Comment

                                    • newtothis
                                      Badcaps Legend
                                      • Mar 2013
                                      • 1556
                                      • england

                                      #19
                                      Re: DP50747 Question

                                      Can you take some close up pics of all the connectors on the PSU so i can see the reference labels next to them please

                                      Comment

                                      • ad1982
                                        Member
                                        • Dec 2013
                                        • 21
                                        • USA

                                        #20
                                        Re: DP50747 Question

                                        Are you talking about on the foil side or the component side? I'll upload what you're looking for this evening.

                                        Comment

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