In the fault analysis of pcb board reliability, the fault mechanisms of the same fault mode are complex and diverse. smt technical engineers need to have correct analysis ideas, rigorous logical thinking and diversified analysis methods to find the real fault causes of pcb board; In this process, if any link is negligent, it is very likely to cause errors. What is the general analysis idea?

1. General analysis ideas of reliability problems

Pcb board background information is the basis of reliability fault analysis, which directly affects the trend of all subsequent fault analysis and has a decisive impact on the final mechanism judgment. Therefore, before failure analysis, the information behind the failure of the pcb board should be collected as much as possible, usually including but not limited to:

2. pcb fault range: fault batch information and corresponding fault rate

① If a single batch of pcb boards in batch production has problems, or the failure rate is low, the possibility of abnormal process control will be greater;

② If the first or more batches have problems, or the failure rate is high, the influence of material and design factors should not be excluded;