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Sorry again about the picture
But we have many many problem with this white residue . You can see, that white color on the annular ring. That the white residue.
Hi FvM
Thank you for your reply. Sorry with the picture, I think it's clear enough to see the white residue. I send a picture with a mark, picture below. It's not from plating, we have no damaged with the gold plating.
the process is : Clean with acid -> do solder mask -> exposure -> cure...
Hi Brian
it's not the problem with the plating. As i noted above. I send you picture with a mark, picture below. You can see it's has a white residue on annular ring. The process is : Clean acid -> do Solder mask -> exposure -> cure (enough heat and times) -> develop -> test (we find the white...
Hi Klaus
as you can see, on the Annula Ring, we have some white residue, I mark on picture below. It's happen when we do solder mask -> exposure -> cure (enough time) -> develop soldermask -> test (we find the residue at this step.
this residue some time can be cleaned by gently wiping, some...
Hello, my name is Hieu. I'm a process engineer of PCB manufacturing company.
We have an issue about white residue on pad. When we doing solder mask and run developer. We check again see the white residue.
Anybody have an opinions about this issue ?
Picture below
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