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If you don't know the manufacturing process of the board, I made this video so that you can understand it. *The screen is a little too bright and hard to see. Sorry. I will improve it next time. ■Subscribe to the channel here■ / @monozukuritarou 【Reference URL】 ・https://www.systemgear.jp/kiban/proce... ・Self-alignment • Solder ball failure due to self-alignment ・Diagram of the board https://www.fusionpcb.jp/blog/?p=136 【Reference book】 How a printed wiring board is made ■Monozukuri Taro Channel Monozukuri Taro's profile Born in the 1980s. He likes things related to manufacturing. He also works in a job related to the manufacturing industry. Japan has a very large population involved in the manufacturing industry, but he noticed that there were few manufacturing-related videos on YouTube, and decided to provide various information related to the manufacturing industry (monozukuri). "This is not a good thing for Japan's proud manufacturing industry."