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Name and purpose of this feature on PCB, is it "underfill" ?

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  • Name and purpose of this feature on PCB, is it "underfill" ?

    I've seen this on many high volume PCB's under BGA's, what's it called and what's it for exactly ?
    (photo is from a macbook pro)

  • #2
    Hmm, I do not know what is this, anyone?

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