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Why isn’t there some PCB pads soldering adhered?

2589 1 Dec 10.2019, 17:28:10

Hi all, my board has a problem now.Some pads of the PCB can't have solder adhered, we tried to add more solder, but it fails. Could you tell me whether there is a problem for PCB design or craft? we never having any PCB quality problem before. If any one knows, I would be so so grateful.

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