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Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

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    #1

    Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

    Hi,

    Have an Asus X509FJ-EJ115T (X409FB rev 2.0),
    the laptop weren't powering on, found a bad capacitor (short to ground) after a quick search.
    I want to replace a new one but don't know it's rating (couldn't find any boardview / scheme).
    Can some one help me find what capacitor to solder instead of the bad one? (picture attached)
    Attached Files
    Tags: None
    #2
    Re: Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

    Post the markings on the cap that was removed. Include a picture as well.

    The capacitance and voltage will be marked on the capacitor sleeve. From those markings, can proceed to search for a proper replacement.

    Is the bad cap the missing one or in the lower right of the logic board ?

    For the lower right side, post a closer pic including the IC markings near these parts so the IC can be identified.
    Attached Files
    Last edited by mon2; 09-09-2021, 03:37 PM.

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      #3
      Re: Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

      It's a smd capacitor. The voltage on him is 19V
      In the new attached photo Iv'e allready removed it - the laptop works, but I want to put a new one.
      Attached Files
      Last edited by Dexomol; 09-09-2021, 03:44 PM.

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        #4
        Re: Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

        Good pic - it helps.

        The local switching regulator is the one with the markings of "2N=6C".

        This part is from Richtek. Next, need to hunt down the datasheet. I know there is a lookup table for Richtek regulators somewhere on this forum...

        found it through my black belt in Google-fu; Sensei should be proud.

        Datasheet is attached. Next, need to study their typical appnote for a possible replacement part.

        See attached.

        Can you power down and confirm that the IC with "2N=6C" is pin # 15 that is linked to this missing cap ?

        Believe it is the LGATE1 pin.

        Update - in zooming in more, it may be the UGATE1 pin # 16 ?
        Attached Files
        Last edited by mon2; 09-09-2021, 04:06 PM.

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          #5
          Re: Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

          Yeah, it's (#16) going to to Gate pin of the MOSFET.

          so, if I'm not mistaking it's C1 at hte datasheet, 10uF?
          Last edited by Dexomol; 09-09-2021, 04:18 PM.

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            #6
            Re: Asus X509FJ-EJ115T (X409FB rev 2.0) - Bad capacitor

            Replaced with 10uF eventually, working good so far.

            mon2 thank you very much for your help!!!

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