Missing Capacitor on NOTEBOOK motherboard

Posted on 2007-10-04
Last Modified: 2013-11-17
I was replacing a DC Jack on a laptop motherboard, and unfortunately, I knocked off a tiny capacitor right beside the DC Jack, and of course, this capacitor is right after the + Voltage pin, so obviously, it won't charge now.  I don't know enough about this to fix it.  Luckily, the capacitor is not so small that i cannot physically solder on another one, but I don't know the capacitance, so should I replace it?  IS IT POSSIBLE TO JUST RUN SOME SOLDER OVER THE SPOT ;-p, probably not is my assumption, but I HAVE to fix this somehow.  
Question by:dbestcomputers
    LVL 4

    Expert Comment

    I believe your best bet would be taking it to a professional electrician/engineer and seeing if anything can be done.  From your post it seems like this is a client PC...?  If so, while you might be able to do this on your own, you'd at least have some sort of guarantee on their work.
    LVL 26

    Expert Comment

    What is the make and model of the laptop and is it still under warranty? If it is, contact the manufacturer. If it's not, by providing identification information we may be able to point you in the direction of a service manual or offer other assistance.
    LVL 31

    Assisted Solution

    Are you sure it's a capacitor? If its absence stops charging, it could well be a diode; a missing capacitor shouldn't have this effect. Not that i matters perhaps, but just so you don't jump to a conclusion and attach the wrong type of component.
    LVL 14

    Expert Comment

    I had a similar problem on my wife's laptop.   The power connector solder connections kept breaking.  After the second fix failed, I gave up.  I "solved" the problem by purchasing a docking station to get power to the laptop.  Not a solution if this is a clients computer but it could allow you a few more years on a personal one.

    Author Comment

    Good call RID, but it is labeled C5320 on the board, so I assume it is a capacitor, because there are R and F numbers as well. Is this a capacitor? And I thought that no matter what it was, that it would stop it from powering, because the trace goes directly from the positive pin to the "capacitor", so breaking it off would result in an open circuit (?correct wording?)   I work with notebooks fairly often, replacing DC Jacks and mainboards, but I honestly don't know enough about it to know if it is fixable.  

    You are correct that this is a client's PC, and I HAVE to fix it tomorrow or Saturday, so there is no way I can send it off.  

    The laptop is a Gateway 7324.  I will try to re-explain the positioning of the capacitor, The DC Jack has traces coming off of it.  The traces go to 2 places.  The POSITIVE center pin trace goes directly to this "capacitor", and I can follow the trace to it's next location after that.

    SO, is there ANY way I can fix this, either by running a wire directly from the POSITIVE center pin to the next location after the "capacitor", or can I fill the spot with solder, or will both of these solutions destroy it.  

    My other thought would be to replace the capacitor, as it is broken off in such a way that I can still solder on another one, but I don't know the capacitance, would this be a viable option? Could I get one that is about the same size?  In previous posts I have had people tell me that the capacitance just has to be approximate, not exact.

    LVL 31

    Accepted Solution

    The "C" suggests a capacitor, yes, but do keep in mind that a capacitor can't be in series with a DC current; it'll block DC. Measure the component, just to be sure (unless it's totally broken...) and try to find out what it is. It could of course be a small cap for suppressing interference in the power feed, but it could also possibly be a diode to prevent battery DC going OUT of the unit.
    LVL 39

    Assisted Solution

    You can solder the cap 10nF - 100nF there.

    Featured Post

    How to run any project with ease

    Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
    - Combine task lists, docs, spreadsheets, and chat in one
    - View and edit from mobile/offline
    - Cut down on emails

    Join & Write a Comment

    Suggested Solutions

    As hardware bugs go, this is a strange one! I upgraded a laptop in December 2011 with a 512GB Crucial m4 2.5-inch/9.5mm SATA Solid State Drive (SSD), Crucial part number CT512M4SSD2: …
    The Samsung SSD 840 EVO and 840 EVO mSATA have a well-known problem with a drop in read performance. I first learned about this in an interesting thread here at Experts Exchange:…
    In this sixth video of the Xpdf series, we discuss and demonstrate the PDFtoPNG utility, which converts a multi-page PDF file to separate color, grayscale, or monochrome PNG files, creating one PNG file for each page in the PDF. It does this via a c…
    In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

    746 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    14 Experts available now in Live!

    Get 1:1 Help Now