Explanation of reliability test in PCBA processing?

Explanation of reliability test in PCBA processing?

PCBA manufacturing is not just a combination of material procurement on the basis of SMT chip processing. Any problem with a material will affect the overall results of the PCBA board, which requires us to have sufficient material detection capabilities, supplier management capabilities, technical analysis capabilities, and reliability testing capabilities.

Reliability testing is often ignored by PCBA processing manufacturers, who often believe that as long as the PCBA board test is correct, it will be accepted by the end customer. However, many PCBA boards have such fatal defects as short service life and unstable use in the terminal products, which is caused by the failure of PCBA factories to strictly implement the reliability test.

How to test the reliability of PCBA board?

1. Aging

Place the PCBA board with the test function OK under the specific temperature and humidity conditions, conduct repeated switch on, simulation function operation, load operation, etc., and test the stability of the PCBA board through continuous work for 24 to 72 hours. The aging test takes a long time, which makes it impossible to carry out large-scale batch operation. In the actual process, the aging test is just a sample test, and the overall yield of this batch of products is judged by the qualification rate of the sample test.

2. Vibration test

During the delivery of many PCBA boards to customers, some problems often occur due to vibration during transportation, such as component falling off, pad cracks, etc. Through vibration test, the vibration effect during transportation can be effectively simulated in the laboratory, and the hidden dangers in the welding process can be gradually exposed. So as to avoid batch welding defects to the greatest extent and improve the overall yield of delivery. At present, there is a professional simulation motion vibration workbench on the market, and the price is not high. You can purchase one at 5000 yuan.

3. Surge impact test

In the process of PCBA processing, it is often OK to work under normal voltage, but the fault happens occasionally at a certain surge moment. Many circuit designs are not perfect. They often fail to take into account the fatal effects of transient voltage or current surges on the entire circuit, which requires us to conduct sampling surge tests before mass production of PCBA.

4. Packaging test

This test is often ignored, which leads to a very funny problem: we spent a lot of energy to make the PCBA board perfectly, but we lost in the last packaging and transportation link. The factory shall simulate the packaging form of PCBA board for proper drop test.

The reliability test of PCBA board is not limited to the above items. Each PCBA factory can discuss and decide the specific reliability test scheme with the customer according to the actual situation in order to pursue higher quality manufacturing.