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用LM4675D类功放时,第一次一个焊上后有输入但是就是没有输出,外部电路未发现异常,后来将板上芯片更换后,可以使用,但用了不久,芯片便又没有输出,发现芯片并未发热.怎么回事？谢谢
建议查一下；板上有无短路。
