Why does the open circuit of PCBA cause the failure of the circuit board?
The main reason is that the copper layer of the hole wall is bitten and etched, which makes the hole copper thin or cracked, which reduces the tensile ability of the hole copper, which leads to complete disconnection under the action of welding thermal stress. The biting corrosion is caused by poor PCB manufacturing process. As a result, the thermal expansion coefficient of the Z-axis of the PCB is high, which further aggravates the occurrence of hole copper fracture. Many PCB incoming inspections simply do the circuit on-off test, but do not carry out strict batch reliability inspection. Problems such as the biting of the hole copper and the large thermal expansion coefficient of the substrate must be found through slicing and TMA. .
Therefore, the establishment of a complete PCB control system is very important for the whole machine manufacturing enterprise. Our BQC will establish a batch inspection system for the items that affect the reliability of the PCB to ensure high-quality incoming PCB materials, so as to manufacture products with high reliability. sexual products.
