PCB News - How do we optimize the defect rate of automotive PCB?

How do we optimize the defect rate of automotive PCB?

The following are some of the special practices in the testing process of some representative companies specializing in the production of automotive PCBs for the majority of PCB colleagues for reference:

1. The second test method

Some PCB manufacturers adopt the "second test method" to increase the rate of finding defective boards after 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 leakage.

The good board marking system marks the tested PASS boards for the testing machine, which can effectively prevent the tested boards or bad boards from flowing into the hands of customers. The bad board error-proof box means that during the test, when the PASS board is tested, the test system outputs the signal that the box is opened; on the contrary, when the bad board is tested, the box is closed to allow the operator to correctly place the tested circuit board.

3. Establish the PPm quality system
At present, PPm (Partspermillion, parts per million defect rate) quality system has begun to be widely used in PCB manufacturers. Among the many customers of our company, Singapore HitachiChemICal is the most worthy of reference in its application and results. There are more than 20 people in the factory who are responsible for the statistical analysis of online PCB quality abnormalities and PCB quality abnormal returns. Using the statistical analysis method of SPC production process, each bad board and each returned defective board are classified and statistically analyzed, and combined with auxiliary tools such as microsectioning to analyze in which production process the bad and defective boards are produced. According to the statistical data results, we can solve the problems in the process purposefully.
4. Comparative test method

Some customers use different batches of PCBs for comparison tests with two different brands of models, and track the PPm of the corresponding batches, so as to understand the performance status of the two testers, and choose a better performance tester to test automotive PCBs.

5. Improve test parameters

Choose higher test parameters to strictly detect such PCBs. PCBA OEM foundry substitutes because if you choose a higher voltage and threshold, increase the number of high-voltage read leakage times, which can increase the detection rate of PCB defective boards. iPCB is a high-tech manufacturing enterprise focusing on the development and production of high-precision PCBs. iPCB is happy to be your business partner. Our business goal is to become the most professional prototyping PCB manufacturer in the world. Mainly focus on microwave high frequency PCB, high frequency mixed pressure, ultra-high multi-layer IC testing, from 1+ to 6+ HDI, Anylayer HDI, IC Substrate, IC test board, rigid flexible PCB, ordinary multi-layer FR4 PCB, etc. Products are widely used in industry 4.0, communications, industrial control, digital, power, computers, automobiles, medical, aerospace, instrumentation, Internet of Things and other fields.