Occasional Contributor
Super ContributorHi,
I am not quite understand.
Do you mean you received the device and it already has the scratches?
Or it happens after you wash the device?
From who did you make the purchase? Kindly let us know.
FYI,
Scratch criteria is 2mm max.
If this is a 0.6 or 0.5mm mm solder ball, then the scratch does not exceed that it should not be a concern.
Another way to gauge is if the scratch extends beyond 3 solder balls, then that is likely outside the criteria.
Also, if the you does not see any of the underlying layers, then low risk to reliability, functionality or performance.
Regards,
Aiman
Occasional ContributorHello!
Thank you very much for your reply!
I will attach several numbered photos showing different defects on the solder mask of these components. Please have a look — I believe the defects are not critical and could have occurred during manufacturing.
1. Slight deformation of the solder balls, presumably due to long-term storage — I believe it should not affect soldering.
2. Inclusions under the mask — it seems the surface may not have been properly cleaned from dust before the mask was applied.
3. A strange inclusion on the mask, as if a second layer — it's not near the solder balls. What could this be?
4.1, 4.2, and 4.3: Abrasions on the mask — could such marks remain from cleaning during production, and are they acceptable?
5.1, 5.2, and 5.3: Scratches of varying lengths passing under several solder balls. They are shallow, and the mask is not scratched through — are such minor scratches acceptable?
I would really appreciate your help in evaluating these!
Thank you!
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