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生产两年左右的产品，在最近一个批次生产300片，
大约有6片TPA6211A1DRB 没声音输出，
已做过交叉实验，确定问题就出在TPA6211A1DRB。
测量各个管脚没有发现异常的现象，像这样的现象要如何进行分析。
