new user- my bad caps

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  • delphinecrowfever
    New Member
    • Jan 2013
    • 7
    • uk

    #1

    new user- my bad caps

    Hi, i am new to electronics and i think i have identified a bad cap on my laptop motherboard (laptop is dead) . it has a bunch of numbers on it but after trawling the net i still cant work out what cap i need .

    i have included 2 pics. one is of the suspect bad cap and the other is of the exact same type cap located elsewhere on the mobo.

    it is the smd that has the following written on the top:

    36
    47
    25G

    also it measures about 6mm diameter, height about 4-5 mm (not sure if i measure from base of cap or black plastic mount)

    any help would be great, thanks!
    Attached Files
  • delphinecrowfever
    New Member
    • Jan 2013
    • 7
    • uk

    #2
    Re: new user- my bad caps

    forgot to mention the motheroard is from my dell inspiron 5100. had it for ages but it but it stopped working a few weeks ago.

    Comment

    • selldoor
      Slow Learner
      • Dec 2010
      • 7870

      #3
      Re: new user- my bad caps

      looks like it might be a 25v 47uf - is it surface mounted on a plastic base .
      I dont know a lot about choosing a series for surface mounts but this might be good
      http://www.digikey.com/product-detai...97CT-ND/295976
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment

      • momaka
        master hoarder
        • May 2008
        • 12170
        • Bulgaria

        #4
        Re: new user- my bad caps

        What made you conclude that capacitor is bad and what are the symptoms of the laptop? Electrolytic caps in laptops rarely (if ever) go bad, especially in laptops made in the last 10 years or so. The more common problems are bad DC jacks, bad MOSFET somewhere, shorted ceramic capacitor, or bad joints on a BGA chip.

        Comment

        • delphinecrowfever
          New Member
          • Jan 2013
          • 7
          • uk

          #5
          Re: new user- my bad caps

          The capacitor looks slightly raised up, slightly disfigured and has some brown staining on it (looks like it leaked?). I do not have a meter tester to check it with but would this be the best way for me to test it as well as other components on the motherboard and are there any that are easy to use for a newby you may recommend?.

          The laptop shows no signs of firing up, no lights or fans. It had been prone to overheating but had been running fine since i bought a laptop fan tray.

          Thanks for replies so far

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: new user- my bad caps

            Is the adapter ok- does the adapter light stay on when you turn on the laptop.
            Have you tried it with and without the battery.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • delphinecrowfever
              New Member
              • Jan 2013
              • 7
              • uk

              #7
              Re: new user- my bad caps

              yeah I tried it with and without the battery, bought a spare power supply. the light on the power supply is on until I plug it into the laptop, then it goes off.

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #8
                Re: new user- my bad caps

                As momaka said earlier "The more common problems are bad DC jacks, bad MOSFET somewhere, shorted ceramic capacitor, or bad joints on a BGA chip."
                There is a short on the main board The D505 has an infamous ceramic cap that fails
                short - remove it and the laptop works. On the 505 it was near the DC jack so perhaps start there and work outwards.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

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