solder defect

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hello, I have been experiencing a strange solder defect late... - Sep 20, 2019 by bukas

Looks like poor wetting/solderability to me. I don’t see hee... - Sep 20, 2019 by DeanM

Yes, no wetting on the several leads, to verify is same loca... - Sep 22, 2019 by sssamw

bukas

#83440

solder defect | 20 September, 2019

hello, I have been experiencing a strange solder defect lately. hope some of you may know what is causing it. it happens on same side of processor and there has been no changes in soldering process.

Attachments:

solder 1.bmp [3.8M]
solder 2.bmp [3.8M]
solder.bmp [3.8M]

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DeanM

#83443

solder defect | 20 September, 2019

Looks like poor wetting/solderability to me. I don’t see heel fillets on the leads where the solder balls up. The solder has to go somewhere. It won’t flow where it won’t wet. Try printing a bare board and run through reflow. If the solder balls up on some pads it might point to a solderabiliity issue with the board.

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sssamw

#83446

solder defect | 22 September, 2019

Yes, no wetting on the several leads, to verify is same location of the leads? Looks PCB/IC leads wetting issue, a process contaminated or raw material issue. A cross experiments to verify the potential cause is needed.

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