Electronics > Manufacturing & Assembly

Some pads of the PCB can't have solder adhered, why???

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Erickben:
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.

Rerouter:
You likely need to use a strong flux to strip off the oxide layer before the solder gets a chance at reaching the metal, to my eye that looks like an older board you are reworking

nail10:
i also face the same probelm

Rerouter:
Get some flux (tack / gel / pen) deposit some on the pads, and then heat with an iron tip tinned with some solder (the flux may burn off but it will be refreshed by what is at the joint)

Eva Liu:
Any contamination solder issues?

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