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    Need help to identify a component (diode?)

    Hello guys,

    can you please help my identify components with numbers 53 and 59? They could be a diodes?
    This component 53 is connected in parallel between source and drain of a P Channel A2179 Mosfet.
    I wonder what is their purpose here.

    Thank you!
    Attached Files

    #2
    Re: Need help to identify a component (diode?)

    This might help you

    http://www.s-manuals.com/smd/53


    Zener Diodes

    https://cdn.badcaps-static.com/pdfs/...57602c93cc.pdf

    Google search—> SMD diode “53”





    Someone else would have to answer this question for you

    “ I wonder what is their purpose here. ”


    I hope this helps you
    Last edited by sam_sam_sam; 04-02-2021, 03:56 AM.
    9 PC LCD Monitor
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    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

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      #3
      Re: Need help to identify a component (diode?)

      The thumb nail picture is too small, there seems to be other markings (above the 59) on the devices? Since there are 3 in parallel I would almost suspect they are capacitors?
      What is the board from? any numbers on the board? Can you tell how the circuit is used? is the mosfet just used as a switch?
      Last edited by R_J; 04-02-2021, 11:05 AM.

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        #4
        Re: Need help to identify a component (diode?)

        Thank you sam sam sam.
        R_J this is from Fujitsu H700 laptop board. I have no schematics, but I can guess that Mosfets are used for protection since thea are in close proximity of the batery. There is a current sensing resistor there.
        Last edited by Askic; 04-02-2021, 11:59 PM.

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          #5
          Re: Need help to identify a component (diode?)

          It looks like a Tantalum capacitor to me too.
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