Asus Zenbook ux31a how to know which cap?

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  • Expl332
    New Member
    • Sep 2018
    • 4
    • Slovenija

    #1

    Asus Zenbook ux31a how to know which cap?

    Hello i've posted before under some old thread but anyway i got new led screen for ux31 and it wont work even when i shine into it with a flashlight i don't see anything

    the thing is when i was cleaning it with wet paper towel the little wet bit got inside of mini dp port and after an hour or so the display started to get strange white spots which then all of a sudden died on me... after that i was checking for problems with multi-meter and accidentally shorted the lvds display connector the sort created a bright spark..

    cap burned
    https://imgur.com/a/zhDXnew

    i even try to replace it with almost same looking cap but it still won't work
    https://imgur.com/a/ccbI0gG

    Does somebody knows where i can buy the right cap for this motherboard?And is it this cap which is why i cant get my new screen to work or is it the lvds connector or maybe something else ?


    http://imgur.com/a/J6YOMvC

    Yellow mark the dp port where the bits of wet paper towel were found(I've already removed the whole dp unit it)
    Purple mark is the display cable connector where i've made the second short,
    Red mark is the blown smd capacitor which is located on the other side.



    Thank you
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: Asus Zenbook ux31a how to know which cap?

    If the cap got burnt like that due to a short circuit there's probably more to the issue.
    The cap on the second picture isn't soldered properly.
    UX31A2 schematics is available, and I think the boardview as well.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • jasko_jacker
      Badcaps Legend
      • Oct 2014
      • 1137
      • italy

      #3
      Re: Asus Zenbook ux31a how to know which cap?

      Disconnect lcd and it's flat, check if the laptop visualize properly with external display .
      The lcd you have it is the same of the original?

      Comment

      • Expl332
        New Member
        • Sep 2018
        • 4
        • Slovenija

        #4
        Re: Asus Zenbook ux31a how to know which cap?

        Originally posted by piernov
        If the cap got burnt like that due to a short circuit there's probably more to the issue.
        The cap on the second picture isn't soldered properly.
        UX31A2 schematics is available, and I think the boardview as well.
        FERRITE BEAD (0603) 120OHM/2A
        MAXECHO/ACMS160808A121 2A

        Is the burnt cap

        So i've ordered
        10 X Ferrite Bead, 120 ohm, 0603 [1608 Metric], BLM18E Series, 2 A, 0.04 ohm, ±
        Detailed
        FERRITE BEAD 0.04OHM 2A 0603
        Impedance @ 100MHz : 120ohm
        Ferrite Case Style : 0603 [1608 Metric]
        Product Range : BLM18E Series
        DC Current Rating : 2A
        DC Resistance Max : 0.04ohm
        Impedance Tolerance : ± 25%
        Automotive Qualification Standard : -
        SVHC : No SVHC (17-Dec-2015)
        Core Material : Ferrite
        Ferrite Mounting : SMD
        Operating Temperature Max : +125°C
        Operating Temperature Min : -55°C
        Packaging : Cut Tape
        Resistance : 0.04ohm

        Big thank you piernov for the boardview info
        It looks like that this cap is for AC_BAT_SYS_INV_CON
        and is connected to lvds connector on 4 pins
        just hope i didn't mess something up even more with that cap i put on there from other laptop

        Comment

        • Expl332
          New Member
          • Sep 2018
          • 4
          • Slovenija

          #5
          Re: Asus Zenbook ux31a how to know which cap?

          Originally posted by jasko_jacker
          Disconnect lcd and it's flat, check if the laptop visualize properly with external display .
          The lcd you have it is the same of the original?
          The pc works trough micro hdmi normally

          There is no visible damage on the old screen neither on lvds connector

          Comment

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