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SANYO DP37647 Sound no Picture

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    SANYO DP37647 Sound no Picture

    It powers on just fine with sound, no pic or back lights.

    Power board readings:
    Cn2 goes to main
    PS_on 4.9 v
    5vsb 5.0 5.0 v
    12v 12.0 12.1 v
    24v 24.1 24.1 v
    CN4 goes to inverter
    24.0v
    24.1v
    24.1v
    24.0v
    MAINBOARD from Power board
    K8B
    white 4.9v
    12.0v
    12.0v
    24.1v
    24.0v

    K6R goes to inverter
    white 3.3v
    3.3v
    0.3v
    4.3v
    Attached Files

    #2
    Re: SANYO DP37647 Sound no Picture

    No backlight or no image on lit screen?
    Check inverter fuse.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment


      #3
      Re: SANYO DP37647 Sound no Picture

      Fuse and transformers all in spec .. I should have said I already tried a replacement inverter..
      Last edited by lilmonk3; 09-23-2012, 10:36 AM.

      Comment


        #4
        Re: SANYO DP37647 Sound no Picture

        Inverter VIN measures 4.3V? That is too low but you do have 24V on your power board. Check if there are fuses on the power board - maybe one there.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment


          #5
          Re: SANYO DP37647 Sound no Picture

          Yes I have 24v on power board .. The 4.3 is coming from the main to the inverter

          Comment


            #6
            Re: SANYO DP37647 Sound no Picture

            Can you post a clear shot of the inverter? It doesn't look like the 24V is getting to the inverter - I'm suspecting a fuse on the PSU somewhere (and fuses can be deceptive, looking like anything...) This TV probably uses the 24V for the audio circuit as well, many do.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment


              #7
              Re: SANYO DP37647 Sound no Picture

              I was just looking over the Power board and found this.. Would this ferrite bead cause a problem
              Attached Files

              Comment


                #8
                Re: SANYO DP37647 Sound no Picture

                I don't think so - it's just a bit of ferrous material wrapper around a wire. It's to reduce the interference the TV can kick out with regards to radios etc.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment


                  #9
                  Re: SANYO DP37647 Sound no Picture

                  Its a long inverter.. Here are a few pics
                  Attached Files

                  Comment


                    #10
                    Re: SANYO DP37647 Sound no Picture

                    One thing that made me scratch my head is... On the power board there is a cable 24v connection CN5 that is empty and there is also and empty connection on the inverter.. Is there SUPPOSE to be a cable going between the 2....
                    Attached Files

                    Comment


                      #11
                      Re: SANYO DP37647 Sound no Picture

                      OK, test the voltage as indicated in the image. Red probe on the red highlighted pin, black on the black highlighted pin.

                      You can test the voltage on any of the main caps on the inverter.
                      Attached Files
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment


                        #12
                        Re: SANYO DP37647 Sound no Picture

                        Hmm I wonder. Perhaps the owner tried to fix their TV?
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment


                          #13
                          Re: SANYO DP37647 Sound no Picture

                          Thats what I am wondering... The set didnt SEEM to have been opened but ya never know

                          Comment


                            #14
                            Re: SANYO DP37647 Sound no Picture

                            Do the check I mentioned - if it's zero volts or near enough zero, you can always solder individual wires between the PSU and inverter or crimp your own cable.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment


                              #15
                              Re: SANYO DP37647 Sound no Picture

                              24v on all caps on inverter

                              Comment


                                #16
                                Re: SANYO DP37647 Sound no Picture

                                So I think it's OK. That plug on the PSU is probably for a slave inverter, and on the other inverter is probably for a different PSU, or for use as a slave inverter in some way. Check all the transformers on the inverter next as you have Darfon ones and they often fail.
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment


                                  #17
                                  Re: SANYO DP37647 Sound no Picture

                                  Transformer all are good.. One of the first things I checked

                                  Comment


                                    #18
                                    Re: SANYO DP37647 Sound no Picture

                                    Check the primaries of the transformers too. I've never seen one fail, but wouldn't rule it out. You are expecting close to 0 ohms.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment


                                      #19
                                      Re: SANYO DP37647 Sound no Picture

                                      Oh, and did you check this fuse too?
                                      Attached Files
                                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                      Comment


                                        #20
                                        Re: SANYO DP37647 Sound no Picture

                                        Secondary all 0.3, primary 2.15 ,all white fuses 1.0

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