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The method of optimizing defect rate for Automotive PCB


Among the key applications of PCBs today, automotive PCBs occupy an important position. PCB copy board, but due to the special working environment, safety and high current requirements of the car, it has higher requirements on PCB reliability and environmental adaptability, and the types of PCB technology involved are also wide, which is for PCB companies. It is a challenge; for manufacturers who want to develop the automotive PCB market, more understanding and analysis of the new market is needed.

 The following is a representative part of the professional production of automotive PCB companies in the testing process, some special practices are provided to the majority of PCB colleagues for reference:


 1. The second test method


 Some PCB manufacturers have adopted the “secondary test method” to improve the rate of defects found in the first high-voltage electrical breakdown.


 2. bad board foolproof test system


 More and more PCB manufacturers have installed “good board marking system” and “bad board error prevention box” in the light board testing machine to effectively avoid human error. The good board marking system identifies the tested PASS board for the test machine, which can effectively prevent the tested board or bad board from flowing to the customer. The bad board error prevention box is the signal that the test system outputs the box opening when the PASS board is tested during the test; otherwise, when the bad board is tested, the box is closed, allowing the operator to correctly place the tested circuit board.


 3. Establish a PPm quality system


 At present, PPm (Partspermillion, defect rate of parts per million) quality system has been widely used in PCB manufacturers. Among the many customers of our company, the application and achievements of HitachiChemICal in Singapore are the most worthy of reference. More than 20 people in the factory are responsible for the statistical analysis of online PCB quality abnormalities and abnormal PCB quality returns. Using the SPC production process statistical analysis method, each piece of bad board and each piece of defective board returned are classified and statistically analyzed, and combined with auxiliary tools such as micro-slices to analyze which manufacturing process produces bad and defective boards. According to the statistical data results, the problem occurred in the process is purposefully solved.


 4. Comparative test method


 Some customers use different brands of different types of PCBs for comparative testing, and track the PPm of the corresponding batches to understand the performance of the two test machines, so as to select a better performance test machine to test the automotive PCB.


 5. Improve test parameters


Choose higher test parameters to strictly detect such PCB. PCBA OEM foundry materials, if you choose higher voltage and threshold, increase the number of high-voltage read leakage, can improve the detection rate of PCB defective board. For example, a large Taiwan-funded PCB company in Suzhou uses 300V, 30M, and 20 ohms to test automotive PCBs.



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