SANYO DP37647 Sound no Picture

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: SANYO DP37647 Sound no Picture

    What range are you testing secondaries on? I think you're testing them wrong somehow - you'd be expecting a number in the 1000 - 5000 ohm range.
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    • lilmonk3
      Badcaps Veteran
      • Apr 2012
      • 259
      • USA

      #22
      Re: SANYO DP37647 Sound no Picture

      Auto ranging

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      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: SANYO DP37647 Sound no Picture

        So, your meter is saying ... 0.3 ohms? 0.3 kohms? ?
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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        • lilmonk3
          Badcaps Veteran
          • Apr 2012
          • 259
          • USA

          #24
          Re: SANYO DP37647 Sound no Picture

          2.21 K and 0.3K

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          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: SANYO DP37647 Sound no Picture

            2.21k for the secondaries? Sounds reasonable. 0.3 kohm for the primaries, on the other hand, doesn't seem so reasonable.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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            • lilmonk3
              Badcaps Veteran
              • Apr 2012
              • 259
              • USA

              #26
              Re: SANYO DP37647 Sound no Picture

              Originally posted by tom66
              So, your meter is saying ... 0.3 ohms? 0.3 kohms? ?
              You are correct it is 0.3 OHMS not Kohms... Sorry I was watching a Big TOUCHDOWN Play while typing

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              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: SANYO DP37647 Sound no Picture

                Just to verify this is how you are testing them? Secondary sense isn't absolutely crucial, as it rarely fails.

                You have tried a second inverter? I didn't notice that until now. OK, there may be a way to force the back light to switch on if for some reason the main board isn't doing it. What is the model of the LCD panel? I will try and look up the pin-out for the inverter connector.
                Attached Files
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                • lilmonk3
                  Badcaps Veteran
                  • Apr 2012
                  • 259
                  • USA

                  #28
                  Re: SANYO DP37647 Sound no Picture

                  I tested the transformers as stated here http://lcdparts.net/TransformerDetai...ProductID=2795 .. panel is AUO T370XW02 V.5

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                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #29
                    Re: SANYO DP37647 Sound no Picture

                    That seems good then, one moment please. . .
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                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: SANYO DP37647 Sound no Picture

                      OK the first pin measuring 24V is pin 1.

                      Pin 12 has the ON/OFF control signal. What does this measure?
                      Pin 11 has the dimming signal. What does it measure?
                      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.

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                      • lilmonk3
                        Badcaps Veteran
                        • Apr 2012
                        • 259
                        • USA

                        #31
                        Re: SANYO DP37647 Sound no Picture

                        Originally posted by tom66
                        OK the first pin measuring 24V is pin 1.

                        Pin 12 has the ON/OFF control signal. What does this measure?
                        Pin 11 has the dimming signal. What does it measure?
                        where are you wanting me to get these readings?? The inverter??

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                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: SANYO DP37647 Sound no Picture

                          Yes. On the connector going to PSU.
                          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.

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                          • lilmonk3
                            Badcaps Veteran
                            • Apr 2012
                            • 259
                            • USA

                            #33
                            Re: SANYO DP37647 Sound no Picture

                            Pin 1- 24v
                            pin 12- 3.3
                            pin 11-3.3

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                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #34
                              Re: SANYO DP37647 Sound no Picture

                              By all means you should have a picture. Do you see a brief flash from the screen in a dark room? It may be a faulty CCFL.
                              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.

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                              • lilmonk3
                                Badcaps Veteran
                                • Apr 2012
                                • 259
                                • USA

                                #35
                                Re: SANYO DP37647 Sound no Picture

                                No flash. But I will double check this evening as it will be pitch black in this room then.. I am really starting to wonder about those connections that have nothing connected to them..
                                Last edited by lilmonk3; 09-23-2012, 02:27 PM.

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                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #36
                                  Re: SANYO DP37647 Sound no Picture

                                  Apparently the other connector just provides 24V and ground - extra power I guess maybe for a bigger screen. I don't think it's supposed to be connected for the 37".



                                  page 10.
                                  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.

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                                  • lilmonk3
                                    Badcaps Veteran
                                    • Apr 2012
                                    • 259
                                    • USA

                                    #37
                                    Re: SANYO DP37647 Sound no Picture

                                    Ok..

                                    Originally posted by tom66
                                    Apparently the other connector just provides 24V and ground - extra power I guess maybe for a bigger screen. I don't think it's supposed to be connected for the 37".



                                    page 10.

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                                    • lilmonk3
                                      Badcaps Veteran
                                      • Apr 2012
                                      • 259
                                      • USA

                                      #38
                                      Re: SANYO DP37647 Sound no Picture

                                      Well just as I thought, no flashes or anything in a pitch black room...

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                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: SANYO DP37647 Sound no Picture

                                        I would suspect the bulbs then, or it could be bad ballast caps like budm had:
                                        http://s807.photobucket.com/albums/y...ent%20FLX-3210
                                        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

                                        • lilmonk3
                                          Badcaps Veteran
                                          • Apr 2012
                                          • 259
                                          • USA

                                          #40
                                          Re: SANYO DP37647 Sound no Picture

                                          Ok.. Well I guess its time to do some dissecting

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