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LM4991 WSON封装 工作问题

Other Parts Discussed in Thread: LM4991

LM4991 WSON封装,手工搭建的电路,5.2V供电,通电后,扬声器无声音。

测量2脚bypass有2.4V的电压,说明整个芯片已经开始工作,但就是没有声音。

不知道电路在什么地方出问题?相同的电路我换上SOIC封装的LM4991工作正常。