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
    Tags: None
    • 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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