https://blog.wongcw.com/2020/03/27/pcb%e4%be%9b%e6%87%89%e5%95%86%ef%bc%9aiphone-12%e6%b2%92%e6%9c%89%e5%bb%b6%e6%9c%9f%e3%80%81%e4%bb%8d%e6%8c%89%e9%83%a8%e5%b0%b1%e7%8f%ad%e6%8e%a8%e9%80%b2/