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Can Anyone Identify the Value of This Component ?

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    Can Anyone Identify the Value of This Component ?

    Filter at L1 appears marked with the letter H anyone know what that means ? From an Amazon Fire stick remote control. The remote was burning through batteries at an alarming rate I may have popped the filter on disassembly don't know. Also missing a small resistor above it with unknown value but first things first ...
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    #2
    Re: Can Anyone Identify the Value of This Component ?

    Lx is normally the suffix for an inductor.
    Willing to help but I'm no expert.

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      #3
      Re: Can Anyone Identify the Value of This Component ?

      Okay what is the value of an inductor marked with the letter H ?

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        #4
        Re: Can Anyone Identify the Value of This Component ?

        No idea. I suspect a search of the internet may come up wiith an answer. Have you a suitable meter to measure it's inductance?
        Can you post a clearer close shot of the smd device. I see several smd fuses online with H on the package
        Last edited by dick_barton; 07-17-2021, 09:20 AM.
        Willing to help but I'm no expert.

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          #5
          Re: Can Anyone Identify the Value of This Component ?

          Agreed the picture is way too small.

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            #6
            Re: Can Anyone Identify the Value of This Component ?

            Share the markings of the smd ic next to this inductor.

            It appears to be a local buck switching regulator. The ic could help to identify the value for this part.

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              #7
              Re: Can Anyone Identify the Value of This Component ?

              As stated in the first post I do not have the inductor it is missing on my board. The pic is a frame from a youtube video.

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                #8
                Re: Can Anyone Identify the Value of This Component ?

                Originally posted by mon2 View Post
                Share the markings of the smd ic next to this inductor.

                It appears to be a local buck switching regulator. The ic could help to identify the value for this part.
                Yes this is a good idea though I will say I've looked it up and found nothing but if you can please let me know.

                Marking is 4FN5R

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                  #9
                  Re: Can Anyone Identify the Value of This Component ?

                  Is it the sot23-5 next to the inductor? My first guess is a Torex XC9140A
                  Last edited by R_J; 07-23-2021, 07:46 PM.

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                    #10
                    Re: Can Anyone Identify the Value of This Component ?

                    It’s quit likely not that critical but given the relative indicated size, (determined by wire size used to make the inductor and the designed current anticipated) replacement could be
                    2-3 μh SMT like a TDK SPM3010-LR or a TMS252012ALM depending on the actual dimension of the pads which were not provided.

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                      #11
                      Re: Can Anyone Identify the Value of This Component ?

                      I've replaced the inductor with one of appropriate size and hopefully value (no marking) harvested from an old iphone board. Now, I am missing a resistor going to the chip enable pin which must be high to be active. The 3v supply is there. I think the resistor is for current limiting ? What value is suggested for the resistor ?

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                        #12
                        Re: Can Anyone Identify the Value of This Component ?

                        33 ohms ? 100 ohms ? Is the value critical for this circuit ?

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