Sanyo DP42848

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  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #1

    Sanyo DP42848

    Picked up another Sanyo DP42848. Set turns on for about 1-2 seconds appears to have backlights on left side of screen (slave side) but not the right side. I suspect a bad master inverter?? I have tested the PS and here is what I have:
    24V 23.89vdc
    SGND 0
    12v 12.09vdc
    SGND 0
    5v 4.99vdc
    SGND 0
    PSON 4.88
  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #2
    Re: Sanyo DP42848

    Pics
    Attached Files

    Comment

    • landyboy
      Badcaps Veteran
      • Apr 2013
      • 443
      • USA

      #3
      Re: Sanyo DP42848

      Ok I am adding one more pic: I have tested red to red to be .2 ohms and Green to green open. Also tested the slave inverters and got the same results.
      Attached Files
      Last edited by landyboy; 07-04-2013, 11:46 AM.

      Comment

      • landyboy
        Badcaps Veteran
        • Apr 2013
        • 443
        • USA

        #4
        Re: Sanyo DP42848

        Just for my reference. Does the master support a bank of lights on the one side of the panel and the slave the other. Or do both supply the same bank of cffl's? I'm not clear on the function of the master and slave inverters.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Sanyo DP42848

          Usually they drive opposite ends of the same bulbs. Bad master, no light, bad slave, half panel lit up briefly.
          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

          • landyboy
            Badcaps Veteran
            • Apr 2013
            • 443
            • USA

            #6
            Re: Sanyo DP42848

            Thanks !!

            Comment

            • landyboy
              Badcaps Veteran
              • Apr 2013
              • 443
              • USA

              #7
              Re: Sanyo DP42848

              Ok changed the Slave inverter same issue.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Sanyo DP42848

                You had light on the slave side. While rare for this to happen if anything it indicates a good slave. I've never seen it happen before, but my first bet would have been on the master, due to no light from that side. On most sets, the reason a bad master will result in no light emitted is because the master controls the slave, but perhaps it's possible to have a partial failure of the master inverter...
                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

                • landyboy
                  Badcaps Veteran
                  • Apr 2013
                  • 443
                  • USA

                  #9
                  Re: Sanyo DP42848

                  Since I have the spare slave now do you think changing the inverter coils themselves would be a bad idea? They are they same on both side I can just de-solder and re-solder.

                  Comment

                  • landyboy
                    Badcaps Veteran
                    • Apr 2013
                    • 443
                    • USA

                    #10
                    Re: Sanyo DP42848

                    I may have misunderstood your earlier post 5 from top.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Sanyo DP42848

                      Originally posted by landyboy
                      I may have misunderstood your earlier post 5 from top.
                      No, I read my post again and I was ambiguous in what I said, so it's at least partly my fault.
                      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

                      • landyboy
                        Badcaps Veteran
                        • Apr 2013
                        • 443
                        • USA

                        #12
                        Re: Sanyo DP42848

                        Its all good, do you think I should try replacing the inverter coils?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Sanyo DP42848

                          I think you have that inverter controller IC (18 pin chip?) which commonly fails. Did you check the fuses & FETs?
                          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

                          • landyboy
                            Badcaps Veteran
                            • Apr 2013
                            • 443
                            • USA

                            #14
                            Re: Sanyo DP42848

                            Here are the Fets...Fuses all good.
                            ( For the sake of time saving all the fets test within a few thousands of each other except one that has a "5" designation on the board.
                            2.539Mohm
                            10.07mohm
                            2.224Mohm

                            "5" tests
                            7.14k
                            10.29k
                            3.148k
                            Attached Files

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Sanyo DP42848

                              #5 is the +5V regulator. Check, with set powered, voltage on all three pins, red probe on each pin and black on ground/chassis.
                              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

                              • landyboy
                                Badcaps Veteran
                                • Apr 2013
                                • 443
                                • USA

                                #16
                                Re: Sanyo DP42848

                                23.8
                                0
                                4.915

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Sanyo DP42848

                                  Seems OK then.

                                  F2 on master and F200 on slave ... what voltage on each end?
                                  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

                                  • landyboy
                                    Badcaps Veteran
                                    • Apr 2013
                                    • 443
                                    • USA

                                    #18
                                    Re: Sanyo DP42848

                                    23.99 all sides. When I powered up set I did hear a slight buzzing form the Master side

                                    Comment

                                    • landyboy
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 443
                                      • USA

                                      #19
                                      Re: Sanyo DP42848

                                      Any way to test that IC?

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: Sanyo DP42848

                                        You can check each of the FETs gate to source for shorts, the IC can make shorts appear if it is bad. But otherwise you really need a scope to check the drive waveforms.
                                        Last edited by tom66; 07-10-2013, 04:40 AM.
                                        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

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