Identifying component Flyback? DC-DC?

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  • unimatrix93
    Badcaps Veteran
    • Oct 2021
    • 338
    • Magyarország

    #1

    Identifying component Flyback? DC-DC?

    Can I ask you guys help me identify this godforsaken component?

    I'm tearing my hair out finding this component.

    The board is from an egg incubator.
    i got it with a "popped cap" while there are many damaged components on it, which got succesfully identified with one exception:
    Click image for larger version

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    And here is the board where it came from (U1/1):
    Click image for larger version

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    Click image for larger version

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    As you can see, the IC is badly damaged. Only a few characters are visible and a unknown by me manufacturer logo. Also it has 3 pin on the top side.
    Can you please help me find out what is it?
    Attached Files
  • Answer selected by unimatrix93 at 05-10-2024, 01:20 AM.
    truclacicr
    Badcaps Veteran
    • Apr 2019
    • 289
    • australia

    The manufacturer is Crystal Source Microelectronics.

    Datasheet for CSC7136D:

    https://dfsimg2.hqewimg.com/group1/M...vXAKmCs236.pdf
    Attached Files

    Comment

    • truclacicr
      Badcaps Veteran
      • Apr 2019
      • 289
      • australia

      #2
      Try reposting your question here:

      https://www.eevblog.com/forum/repair/

      Comment

      • petehall347
        Badcaps Legend
        • Jan 2015
        • 4421
        • United Kingdom

        #3
        st micro

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3900
          • Canada

          #4
          Why go to eevblog, they are a cranky bunch over there.
          These IC's are in-country copies of real parts. It's not ST, it could be "SC" or "STC" the S is for Shenzhen. Most SOP-7's have pin 3 missing but here it is pin 7 which narrows it down.
          Looking at the circuit, closest IC PN8370SSC matches pinout and primary-side voltage sensing but it's too much at 18W.
          OP's board the sense-resistor on pin 4 is also blown.

          Comment

          • truclacicr
            Badcaps Veteran
            • Apr 2019
            • 289
            • australia

            #5
            PN8366 is rated for 6W loads:

            Comment

            • truclacicr
              Badcaps Veteran
              • Apr 2019
              • 289
              • australia

              #6
              I hate this forum's software.

              I hope this URL works:

              https://voltatech.ir/wp-content/uploads/2021/11/آی-سی-PN8366-پکیج-SMD.pdf (PN8366, 6W)

              https://radioremont.com/wa-data/publ...nts/PN8360.pdf (PN8360, 12W)
              Last edited by truclacicr; 05-09-2024, 04:35 PM.

              Comment

              • R_J
                Badcaps Legend
                • Jun 2012
                • 9512
                • Canada

                #7
                It could be this, CSC7136D seems to be the same pinout as the pn8360
                Attached Files
                Last edited by R_J; 05-09-2024, 08:00 PM.

                Comment

                • truclacicr
                  Badcaps Veteran
                  • Apr 2019
                  • 289
                  • australia

                  #8
                  The manufacturer is Crystal Source Microelectronics.

                  Datasheet for CSC7136D:

                  https://dfsimg2.hqewimg.com/group1/M...vXAKmCs236.pdf
                  Attached Files

                  Comment

                  • unimatrix93
                    Badcaps Veteran
                    • Oct 2021
                    • 338
                    • Magyarország

                    #9
                    Thank you everyone for helping me out!
                    You are the best. 🤘

                    I was pulling my hair out identifiying this exploded sh˙t.

                    Comment

                    • redwire
                      Badcaps Legend
                      • Dec 2010
                      • 3900
                      • Canada

                      #10
                      What about the blown sense-resistor at pin 4? Maybe "2R2" marking? gives 227mApk I think.

                      Comment

                      • unimatrix93
                        Badcaps Veteran
                        • Oct 2021
                        • 338
                        • Magyarország

                        #11
                        Originally posted by redwire
                        What about the blown sense-resistor at pin 4? Maybe "2R2" marking? gives 227mApk I think.
                        Yes, its a 2K2.
                        Also have to replace:
                        - 2KV keramic 1nF cap.
                        - B1000S05 bridge rectifier
                        - 450V/6.8uF capactior
                        - An unkown cap next to it
                        - A BT131-600
                        - A microswitch
                        - And repair some track.

                        Comment

                        • R_J
                          Badcaps Legend
                          • Jun 2012
                          • 9512
                          • Canada

                          #12
                          That resistor from CS to ground is likely a 2R2 (2.2Ω) resistor, not a 2K2 (2.2KΩ)
                          If the unknown cap is the vcc capacitor off D9, it is likely around 47µf/50v
                          Last edited by R_J; 05-13-2024, 06:46 PM.

                          Comment

                          • redwire
                            Badcaps Legend
                            • Dec 2010
                            • 3900
                            • Canada

                            #13
                            Does it have a fuse anywhere? I would add one.
                            Or for all the blown parts from the power surge, consider just using another small DC power supply feeding this control board. It must output 5 or 9 or 12V at most 1A.
                            The triac is for the turntable motor? No light or heater?

                            Comment

                            • R_J
                              Badcaps Legend
                              • Jun 2012
                              • 9512
                              • Canada

                              #14
                              The fuse is next to the plug in the heatshrink

                              Comment

                              • redwire
                                Badcaps Legend
                                • Dec 2010
                                • 3900
                                • Canada

                                #15
                                What pic is that in? I can't see any heatshrink in the posted pics.

                                Comment

                                • CapLeaker
                                  Leaking Member
                                  • Dec 2014
                                  • 7958
                                  • Canada

                                  #16
                                  redwire I think RJ means the first post second picture, very last plug on the bottom. Below it there is black something.

                                  Comment

                                  • petehall347
                                    Badcaps Legend
                                    • Jan 2015
                                    • 4421
                                    • United Kingdom

                                    #17
                                    this was a fuse . Click image for larger version

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                                    Comment

                                    • redwire
                                      Badcaps Legend
                                      • Dec 2010
                                      • 3900
                                      • Canada

                                      #18
                                      Melted copper traces, but nothing looking like an arc happened thought it should be black. Oh wait the trace she gone.
                                      I have issues with cheap chinese power supplies having no fuse, how do we allow this junk into our countries.

                                      Comment

                                      • unimatrix93
                                        Badcaps Veteran
                                        • Oct 2021
                                        • 338
                                        • Magyarország

                                        #19
                                        So after the IC arrived from China I repaired the damaged traces and proceeded to install the IC.

                                        The test resulted in a glorious explosion and the 2R2 resistor blew up also burning off the metal side of the ceramic capactor. The bridgerectifier (B1000S05) and the fuse (250V/10A) also died.

                                        The explosion happened after holding down the power button for a few seconds.

                                        What could cause this issue? I did not connect the other parts to the PCB like the motor and fan, only the main AC.

                                        Comment

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