Firstly, regarding PCB design performance, it can be testified and checked as we finished it. That even if the PCB design schematic is correct.
Subsequently, PCB fabrication is most important for every process, not only for material selection, including every process of fabrication, and assembly.
Third, we would conduct debugging to check and verify whether the quality is good or not.
Even the PCB design and fabrication are perfect jobs, but there are some low-qualified processing with poor quality inspection and checking. The result would be poor as in this case.
Therefore, it’s especially important to implement quality checking, inspection, and we need to ensure all items are carried out based on a perfect quality control plan.
Quality Assurance can guarantee the quality for all items we need to care about in the process from PCB design to PCB manufacturing.
The task in quality control and assurance of PCBs comes primarily ineffective management, monitoring, and checking, inspecting, verifying on PCB design, PCB Fabrication, and PCB Assembly, including all mechanical parts, electronic parts, and manufacturing processes.