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大概照着芯片手册画了个板子。发现TPA3118D2 SYNC管脚无方波输出，理论上应该有100KHz方波输出。原理图如下：
这种情况不外乎两个方面的原因.
1. 设计问题, 检查看看引脚有没有弄错, 信号电平, 电源, 复位等等是否正常
2. 焊接问题, 有没有虚焊, 连接等问题
