Sanyo DP42849 - No Power At All

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  • NihonNoir
    Badcaps Veteran
    • Jan 2014
    • 231
    • US

    #341
    Re: Sanyo DP42849 - No Power At All

    The results on the IC602, right?

    If you could explain to me in detail how to do the test again, I'll redo it, just in case I did do it incorrectly.

    Thanks!

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #342
      Re: Sanyo DP42849 - No Power At All

      You should use diode mode on the secondary/cold side (board unplugged) and see about 1V one way and infinity the other way - though if it is in circuit it might not work.
      You can also check the voltage across each side and be sure that the multimeter probes are touching each pin - verify with continuity check.
      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

        #343
        Re: Sanyo DP42849 - No Power At All

        For IC602, the two legs on the secondary side, diode mode:
        "1" one way
        1253 the other.

        IC 902:
        "1"
        1340

        IC 201:
        "1"
        "1"

        IC903:
        "1"
        1196 (but leads are reversed in comparison to the other ICs)

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #344
          Re: Sanyo DP42849 - No Power At All

          IC201 does not look right to me. What part # is printed on it?
          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

            #345
            Re: Sanyo DP42849 - No Power At All

            I'll get that in a second. I redid the voltage test on all of them as well:

            IC902: 0.87 --> 1.93
            IC201: 0 --> 0
            IC602: 0 --> 0
            IC903: 16.57 --> 19.86

            Comment

            • NihonNoir
              Badcaps Veteran
              • Jan 2014
              • 231
              • US

              #346
              Re: Sanyo DP42849 - No Power At All

              All 4 ICs have same part number:
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #347
                Re: Sanyo DP42849 - No Power At All

                IC201 should test as around 1200~1400 on your meter. So I think it is bad.
                SHARP PC123 optocoupler.
                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

                  #348
                  Re: Sanyo DP42849 - No Power At All

                  Let me test one more time to make sure.

                  So those are the optocouplers? LOL I thought it was that shiny yellow thing above them.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #349
                    Re: Sanyo DP42849 - No Power At All

                    Shiny yellow thing is probably a transformer.
                    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

                    • lookimback
                      Badcaps Legend
                      • Aug 2013
                      • 1489
                      • USA

                      #350
                      Re: Sanyo DP42849 - No Power At All

                      I have the exact TV with that power supply on my work bench right now. I have to replace an AS15 on the Tcon. I could probably help you with some comparison readings. I won't be home from work until about 9:00 p.m. EST though.
                      ------------signature starts here------------


                      Comment

                      • NihonNoir
                        Badcaps Veteran
                        • Jan 2014
                        • 231
                        • US

                        #351
                        Re: Sanyo DP42849 - No Power At All

                        Sweet, thanks!

                        Comment

                        • NihonNoir
                          Badcaps Veteran
                          • Jan 2014
                          • 231
                          • US

                          #352
                          Re: Sanyo DP42849 - No Power At All

                          So IC902 and IC903 are oriented the same way in the board, but I have to reverse the leads when doing diode check on them to get comparable readings. Is that normal?

                          Comment

                          • lookimback
                            Badcaps Legend
                            • Aug 2013
                            • 1489
                            • USA

                            #353
                            Re: Sanyo DP42849 - No Power At All

                            Just post the pins you need readings from and I'll post what I get from them.

                            Not sure What you have for a meter but I have a Fluke model 115. There will probably be slight variations between our readings but they will probably be close enough. I'm sure with Tom's help and my readings we can figure this out.
                            ------------signature starts here------------


                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #354
                              Re: Sanyo DP42849 - No Power At All

                              Compared to IC602?
                              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

                              • lookimback
                                Badcaps Legend
                                • Aug 2013
                                • 1489
                                • USA

                                #355
                                Re: Sanyo DP42849 - No Power At All

                                You have to remember that electricity follows the path of least resistance. You probably aren't getting a reading through the component but rather, through the rest of the circuit. Sometimes you have to remove the component to test it.
                                ------------signature starts here------------


                                Comment

                                • NihonNoir
                                  Badcaps Veteran
                                  • Jan 2014
                                  • 231
                                  • US

                                  #356
                                  Re: Sanyo DP42849 - No Power At All

                                  I see what the problem was with IC201's reading. It's the only IC whose orientation is reversed. When I test it on the other side - red lead on pin1 - I get 1367.

                                  IC903, 602, and 902 are all situated in the board the same way - here's how I get my diode readings:

                                  IC903: Black on pin 1 - 1196
                                  IC602: Red on pin 1 - 1253
                                  IC201 (reversed in board): Red on pin 1 on PRIMARY side - 1367
                                  IC902: Red on pin 1 - 1340
                                  Last edited by NihonNoir; 03-02-2014, 01:59 PM.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #357
                                    Re: Sanyo DP42849 - No Power At All

                                    Electric current does not follow the path of least resistance. Current takes each path with a magnitude inversely proportionally to its resistance.
                                    (Electrical arcs are the only type of current which follows this least resistance idea - i.e. lightning - but that's a different phenomenon to pure electric current.)
                                    Last edited by tom66; 03-02-2014, 02:16 PM. Reason: I derped a word
                                    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

                                      #358
                                      Re: Sanyo DP42849 - No Power At All

                                      So IC201 is good, right?

                                      Why is IC903 different?

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #359
                                        Re: Sanyo DP42849 - No Power At All

                                        I wouldn't know why IC903 is different, that is really odd.
                                        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

                                        • lookimback
                                          Badcaps Legend
                                          • Aug 2013
                                          • 1489
                                          • USA

                                          #360
                                          Re: Sanyo DP42849 - No Power At All

                                          I stand corrected. Thank you for explaining that.
                                          ------------signature starts here------------


                                          Comment

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