In the fault analysis of pcb board reliability problem, the fault mechanism of the same fault mode is complex and diverse. smt technical engineers need correct analysis thinking, careful logical thinking and diversified analysis methods to find the real fault cause of pcb board. In this process, if any link is negligent, it is very likely to cause mistakes. So what's the general idea of analysis?

1. General analysis of reliability problems

Background information of PCB board is the basis of reliability fault analysis, which directly affects the trend of all subsequent fault analysis and has a decisive influence on the final mechanism judgment. Therefore, before fault analysis, try to collect the information behind the pcb board fault, which usually includes but is not limited to:

2. PCBfault range: fault batch information and corresponding failure rate

(1) If there is a problem in a single batch of pcb board in mass production, or the failure rate is low, the possibility of abnormal process control will be greater;

(2) If the first batch or multiple batches of problems, or the failure rate is high, the influence of material and design factors should not be excluded;