Sanyo DP42849 - No Power At All

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  • NihonNoir
    Badcaps Veteran
    • Jan 2014
    • 231
    • US

    #261
    Re: Sanyo DP42849 - No Power At All

    Well, I've emailed him and see if he'll take any less. I'd be surprised if it's gone - most people equate Sanyo with no-name brands, even though it used to be a quality Japanese brand before being sourced to China. We'll see.

    Here's what I got:

    Point 1: "1"
    Point 2: 0.00

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #262
      Re: Sanyo DP42849 - No Power At All

      OK, can you see part number on Q303?
      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

      • NihonNoir
        Badcaps Veteran
        • Jan 2014
        • 231
        • US

        #263
        Re: Sanyo DP42849 - No Power At All

        Originally posted by tom66
        No picture, there is a chance that big inverter transformer is bad, (if no backlight) but you can swap them over, it's just a lot of work.
        Are there any on-site tests that I can do that will give me a better idea of which board is the issue?

        Let me see if I can find Q303.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #264
          Re: Sanyo DP42849 - No Power At All

          Q303 right next to those points you were ohming out.

          If the faulty TV has no backlight but makes sound, then it's likely the transformer.
          If it has a backlight but no image, it's not the transformer.
          Last edited by tom66; 01-30-2014, 01:21 PM.
          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

          • NihonNoir
            Badcaps Veteran
            • Jan 2014
            • 231
            • US

            #265
            Re: Sanyo DP42849 - No Power At All

            Wow, that thing is tiny.

            I can make out a 2, and then a T, and then what looks like another 2 turned once counter-clockwise.

            Comment

            • NihonNoir
              Badcaps Veteran
              • Jan 2014
              • 231
              • US

              #266
              Re: Sanyo DP42849 - No Power At All

              So would shining a flashlight into the screen be a good way of testing for an image without backlight?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #267
                Re: Sanyo DP42849 - No Power At All

                Originally posted by NihonNoir
                So would shining a flashlight into the screen be a good way of testing for an image without backlight?
                Yes.
                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

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #268
                  Re: Sanyo DP42849 - No Power At All

                  Likely MMBT4403.

                  I traced out what I think the schematic for this area is, reverse engineered.

                  Try and follow Blue 1 and Blue 2, as indicated. They go off the edge of the image.

                  When U303_ON_OFF is pulled LOW, the main controller will start working.
                  PFC voltage is ALWAYS active, provided Main VCC is OK.

                  I suspect Main VCC is NOT OK.
                  Attached Files
                  Last edited by tom66; 01-30-2014, 01:44 PM.
                  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

                  • NihonNoir
                    Badcaps Veteran
                    • Jan 2014
                    • 231
                    • US

                    #269
                    Re: Sanyo DP42849 - No Power At All

                    I'll give it a try. In the meantime, here are some better shots of that area.
                    Attached Files

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #270
                      Re: Sanyo DP42849 - No Power At All

                      I've traced some of those lines, I think one goes to J16 and other to IC203 or IC303.
                      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

                      • NihonNoir
                        Badcaps Veteran
                        • Jan 2014
                        • 231
                        • US

                        #271
                        Re: Sanyo DP42849 - No Power At All

                        Blue 1: Looks like it goes to IC303. Then through IC303 to J37.

                        Blue 2: To J16. Then Q602. Not sure if it stops there or keeps going.
                        Attached Files

                        Comment

                        • NihonNoir
                          Badcaps Veteran
                          • Jan 2014
                          • 231
                          • US

                          #272
                          Re: Sanyo DP42849 - No Power At All

                          Originally posted by tom66
                          I've traced some of those lines, I think one goes to J16 and other to IC203 or IC303.
                          That's what I got too!

                          Comment

                          • NihonNoir
                            Badcaps Veteran
                            • Jan 2014
                            • 231
                            • US

                            #273
                            Re: Sanyo DP42849 - No Power At All

                            Is there anything else I should try or test?

                            Thanks!

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #274
                              Re: Sanyo DP42849 - No Power At All

                              Plenty more; but I'll pass over to others for now for a good night, and will try and post tomorrow. Should this not happen please bump the post.
                              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

                              • NihonNoir
                                Badcaps Veteran
                                • Jan 2014
                                • 231
                                • US

                                #275
                                Re: Sanyo DP42849 - No Power At All

                                Bump.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #276
                                  Re: Sanyo DP42849 - No Power At All

                                  Yep, thanks for that, completely forgot
                                  Anyway, check voltage across C603 and ZD601.
                                  Also, voltage from J16 to the -ve of small cap.
                                  Also, voltage across primary side of IC302 and IC303 optocouplers.
                                  (Board installed, same procedure with green light.)

                                  We are closing in on the fault with any luck. It might be Q602 or the optocoupler which is bad.
                                  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

                                  • NihonNoir
                                    Badcaps Veteran
                                    • Jan 2014
                                    • 231
                                    • US

                                    #277
                                    Re: Sanyo DP42849 - No Power At All

                                    Thanks. I'll work on this later and report back.

                                    Comment

                                    • NihonNoir
                                      Badcaps Veteran
                                      • Jan 2014
                                      • 231
                                      • US

                                      #278
                                      Re: Sanyo DP42849 - No Power At All

                                      C603 - 0.06
                                      ZD601 - 0.12
                                      J16 - .03; goes up to .06 when power button is pushed

                                      I don't know how to test the ICs.
                                      Last edited by NihonNoir; 02-04-2014, 06:04 PM.

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #279
                                        Re: Sanyo DP42849 - No Power At All

                                        OK, looks like IC601 is not switching at all.
                                        This is getting a bit tedious, but part # of IC601?
                                        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

                                        • NihonNoir
                                          Badcaps Veteran
                                          • Jan 2014
                                          • 231
                                          • US

                                          #280
                                          Re: Sanyo DP42849 - No Power At All

                                          2A09303
                                          5541

                                          Not positive on that 2, but I'm not sure what else it could be.

                                          Comment

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