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Technical ArticleDo stains on the solder points of a PCB mean that components are damaged?Time：2019-05-09 15:21:18 Click：
Not really. There are two possible reasons, such as the PCB isn't cleaned well before welding or components are damaged.
PS: In general, the process requirement of PCB pads that is smooth and clean. And flux is a kind of welding auxiliary material, which is quite helpful to remove the oxidation film, prevent oxidation and clean the pads.
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