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RF board not soldered

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Jdt

#56998

RF board not soldered | 19 October, 2008

We are having some issues with a RF PCB aprox 1" x 1".

The pads are in the bottom of the PCB and it goes on the Top side of the mother board the pads of the RF board are like a BGA (square pads)and we have troubles to make the proper welding in the pads of the RF board with the pads of the mother, the problem is just with one pad not all of them.

between two pads there is a via hole, I do not why is the reason of this hole, one of the pads that is just beside of this hole is the one with the issue with not proper welding between pads.

Any help??

Regards

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#56999

RF board not soldered | 20 October, 2008

I assume you mean soldered and not welded. If the one pad that is having problems has a via hole next to it, it probably has more copper around it. Try running a hotter profile.

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#57012

RF board not soldered | 20 October, 2008

During reflow soldering, sometimes via fill with solder leaving the solder connection starved.

Questions are: * Specifically, what is the problem you see? * Do the defective pads show that solder has melted in a uniform fashion? * How do the temperature on these pad compare with pad that solder well?

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Jdt

#57020

RF board not soldered | 20 October, 2008

The problem that I see is the pads not soldered and I can see on the X-Ray the solder on the pad after reflow, and yes the solder has melted in a uniform fashion, I have not measured the diference of temperatures in each pad of the PCB, the size is aprox 1"x1", I am gonna send some pictures of the X-ray to show you the defects

Thanks

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