Alt smd cap help

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  • dsc
    Senior Member
    • Aug 2015
    • 53
    • USA
    #1

    Alt smd cap help

    Hi everyone, been a while since I've been on for two reasons.
    1) Got fired from my Cape Cod job and moved back to my house in central MA (not a bad thing as I didn't like it there, had a new job 1 hour later and am saving more $$ now) which resulted in me not having a lot of free time.
    2) Because of the excellent information and previous help from this site I have been able to tackle any project that has come up.
    That being said I am now faced with something I have very little knowledge of which is SMD cap value.
    I have a Macbook Pro 2010 with the video crash problem which is caused by an under-performing SMD cap (I'll attach a photo of it) that is repaired by replacing it with a 330 microfarad 2 volt non-tantalum poly-film cap.
    Here is my problem, I only had a couple of them on hand and am now in need of a couple more.
    They are on back order from Mouser or cost prohibitive (shipping mostly) at this time from other suppliers that are out of the US.
    I simply don't know enough (which means I don't know squat) about cap's to figure out what I could use instead.
    It was suggested by another to simply pull one off of a dead board but again, I have no clue as to what to look for.
    The mod does require increasing the mounting area so a larger size isn't a problem.
    So in short, can someone help guide me in the direction of an alternative cap?
    I have found some 330 caps on an old scrap board but simply don't know if they would work.
    DSC
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    • mariushm
      Badcaps Legend
      • May 2011
      • 3799
      #2
      Re: Alt smd cap help

      They may not be 330 uF , on some surface mount capacitors the last digit is the number of zeroes. So 330 could mean 33 x 10^0 = 33x1 = 33 uF

      Those are polymer capacitors, not tantalum (which are usually dark yellow / brownish) ... tantalum capacitors would have too high esr.

      It would be best to use a multimeter with capacitance measurement to measure them... or built a RC circuit and measure capacitance by how fast the voltage rises.

      See https://youtu.be/VylC8JFoiBo?t=613 you can replace the oscilloscope with a multimeter and a clock timer

        Comment

        • dsc
          Senior Member
          • Aug 2015
          • 53
          • USA
          #3
          Re: Alt smd cap help

          I love Digi-Key, gave them a call and they came up with a substitute in seconds.
          Got 4 of them on the way.
          I have got to get me a "electronics for dummies" book and some video's.
          DSC

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