Nasty underfill

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  • randoomkiller
    New Member
    • Oct 2021
    • 9
    • Hungary

    #1

    Nasty underfill

    Hey there,

    I am currently working on a hobby project of mine where I try to replace a set of soldered on rams to 16GB just for the heck of it, but I've encountered a problem in the form of a nasty underfill.

    Look at the images


    What do you suggest?

    I've tried to scrape it off with a Qian Li 007, and even to move under a hot air station, but no luck.
    Attached Files
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: Nasty underfill

    Is it Lenovo which uses a black colored glue to seal all bga's. Its very hard to remove them without damaging the foil on mb.

    Comment

    • randoomkiller
      New Member
      • Oct 2021
      • 9
      • Hungary

      #3
      Re: Nasty underfill

      Has anyone managed to do it?

      Also I've read that you could just "mill it down", could that work?

      Comment

      • RethoricalCheese
        Badcaps Legend
        • Mar 2013
        • 1517
        • Estonia

        #4
        Re: Nasty underfill

        That's a 2nd gen carbon, yes?

        One method would be to heat it long enough to be sure that solder has melted and then use qianli to pry it off. Takes a bit of force.

        The other would be milling, indeed. Look for videos of iphone milling. They do it with CPU-s.

        Neither method is great or easy but it's not an easy task anyway.

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14030
          • Canada

          #5
          Re: Nasty underfill

          Gathering that you are using a bottom side pre-heater to assist in the removal?

          Email Rewa with the details. They most likely have a solution for this by now in Shenzhen / China.

          Do update your progress here.

          Comment

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