Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Reflow problem

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mij

#62668

Reflow problem | 10 September, 2010

Hi I am currently having problems with micro bgas not self correcting in the reflow process, what could cause this?

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#62669

Reflow problem | 10 September, 2010

They may be misaligned so much so that self centering would not occur. How are you placing the micro BGA's? Depending on how the boards are transported onto the oven's conveyer, by the time they start to go through the oven, there could be additional misalignment. Vibration / too high of an airflow in the oven may also cause misalignments.

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Ray

#62688

Reflow problem | 14 September, 2010

There is problem with the alignment of BGA Balls. Check for any vibration. http://hubpages.com/hub/SMT-Reflow-Soldering-Equipment

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#62694

Reflow problem | 14 September, 2010

Hi,

Do you have an Xray machine? we've had similar problems with micros in the past. I'd place one on double sided tape and x-ray to ensure that it is centered. If it is, i'd look into other issues such as vibration or speed of the PCB in the machine. Ultimately, we ended up placing the micro bga's with our last machine in the line (IP3) , and as the very last component placed. This ended up solving our issues.

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