The Analysis of Defective PCBAs

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In order to save time during the R&D verification stage, many engineers would search for a PCBA manufacturer to create the sample. However, because factories have varying levels of technology, some engineers have discovered an open circuit or short circuit after receiving the sample. Unable to test normally and unable to identify the issue at this time; uncertain as to whether the issue is a result of the factory or the design To save you from getting lost, we have compiled a list of common process errors that occur during PCBA processing.

The solder joints are shrivelled/incomplete/vacant after wave soldering , the solder of the insertion hole and the via hole is not full, and the solder does not climb to the pad of the component surface.

The reasons are:

a) PCB preheating and soldering temperature is too high, so that the viscosity of the solder is too low;

b) The diameter of the insertion hole is too large, and the solder flows out of the hole during PCB assembly;

c) Large lead pads with thin leads for the inserted components, the solder is pulled onto the pads, and the solder joints are dried out;

d) Poor quality of metallized holes or solder resist flowing into the holes;

e) The PCB climbing angle is too small, which is not conducive to flux exhaust.

The assembled printed circuit board, or PCBA board, is the most crucial part of any electrical device, and over the past few decades, PCBA has become more and more in demand worldwide. Many PCB producers are now concentrating on minimizing PCB failures due to the surge in demand. Therefore, a thorough grasp of typical PCB errors is required, particularly to identify the main cause or causes and possess the necessary information to prevent these defects. This knowledge is what guarantees the production of high-quality PCBs and, ultimately, high-quality PCBA products. These points are crucial to pay attention to because they directly affect the final PCB assembly's functioning and quality. Similar to the present wave of technological developments, PCB complexity is always rising, increasing the likelihood of PCB assembly failure.