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.

PCB Assembly
September 13, 2023

The Manufacturer placed components in the wrong position.
Lack of soldering during the process.
Wrong reflow temperature.
Choose wrong components for the PCB.
Improper stencil design and thickness.
Poor de-soldering and rework of components.
Poor quality of PCB.
Bad design of PCB.
Bad materials of PCB.

#PCB Assembly #SMT PCB Assembly #After Sales

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.

Oliver Smith

What Others Are Asking

Is there a standard that defines that the marking actually has to indicate the cathode?

SMD LEDs normally have some kind of marking. We recently had 300 PCBs manufactured where each had 32 LEDs of those. However, the assembly house placed all LEDs in reverse. The cathode is not consistent with the marking of the actual LED that was mounted. Is there a standard defining this?

Oliver Smith December 6, 2023

How do you handle defective PCB with flux residue?

We feel a little disappointed about the batch of goods from oversea suppliers. Some of PCB has flux residue. How should I handle them?

Oliver Smith October 24, 2023

How can I separate PCB antenna and SMA connector?

I am designing a prototype PCB for a Lora node. It will have an SMA connector (J2) and a PCB antenna. Switching RF connectors are not available in my area, so as an amateur enthusiast what is a good way to separate the antennas?

Oliver Smith November 17, 2023