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原帖由: Minho ,

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I’ve seen some boards like this before, although not as colourful as yours! I was never able to figure it out either (no signs of liquid damage etc.) but my suspicion is that this is cleaning fluid residue that wasn’t completely washed off prior to the phone’s final assembly. This could be more prevalent on "true” Apple-refurbished boards  versus  some of the cheapo looking refurbishes.

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