Why do we miss components on a PCBA after the SMT process?

Our company outsources PCB Assembly to a factory. Sometimes, our IQC find some components are missing on the PCB. We want to know why this thing happen.
  1. The Manufacturer placed components in the wrong position.
  2. Lack of soldering during the process.
  3. Wrong reflow temperature.
  4. Choose wrong components for the PCB.
  5. Improper stencil design and thickness.
  6. Poor de-soldering and rework of components.
  7. Poor quality of PCB.
  8. Bad design of PCB.
  9. Bad materials of PCB.

#PCB Assembly #SMT PCB Assembly  #After Sales

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Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.
Picture of Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

What Others Are Asking

How much larger should a plated-through hole be than lead diameter to get good solder wetting?

I’m designing a new PCB where I have a whack of connectors that have to line up with the metalwork. There are some problematic connectors. All 4 pins are round. I want to have the holes as small as possible while allowing for good solder adhesion over the full length of the pin. I’m looking for guidance on how much clearance around the component lead I should have in order to get good solder wetting and adhesion.

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