A2251 burnt ics on logic board

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  • marshmallows
    New Member
    • Oct 2023
    • 6
    • Canada
    #1

    A2251 burnt ics on logic board

    I have a A2251 2020 MBP with 4 Thunderbolt Ports. It has been working fine for some time and I woke up one morning to an unresponsive notebook

    Opened it up and it looks like there are several ICs, which I think are capacitors burnt out.

    How do I go about fixing this? I have repaired many iPhones in the past, but never a laptop motherboard. Do these capacitors just fail on a MBP? In which case, I assume I could just replace them and be good to go. Or does this indicate an upstream failure?

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    • marshmallows
      New Member
      • Oct 2023
      • 6
      • Canada
      #2
      Ok I got the boardview of this machine and looks like they are the PPBUS_G3H Capacitors. The PDF shows them as "OMIT_TABLE" and "CRITICAL", and so am I right to assume that they are absolutely needed?

      Also these are 16V 33uF. What can I replace them with?

      Will these work - https://leeselectronic.com/en/produc...-5-mpc725.html
      Same as these I guess - https://www.digikey.ca/en/products/d...X336M035ATE175

      Just wondering from a size pov

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        • marshmallows
          New Member
          • Oct 2023
          • 6
          • Canada
          #3
          So I got the capacitor removed. Only one of them was burnt. The others seem fine.

          I was trying to test the other 3 caps, but they are not the standard Apple caps. They are Samsung 1827 S3C ones. Bunch of them on the board overall, but they show up as blank on my Capacitor Tester. Their resistance is also near 0. I tested quite a few of these ones, on both sides of the board and the results are mostly the same.

          The other standard Apple caps are detected fine, and the meter shows ESR, capacitance, voltage leak values for them. These show a much higher resistance value

          Here are some photos of the removed traces via a cheap microscope. How does it look? What do you think I should do next?



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