开机测环绕声功放块LM3386的输入端无信号输入,再测杜比定向逻辑解码器M69032的(29)脚也无环绕声信号,但其(39)号脚有解码后的环绕声信号输出,说明故障出自解码器M69032,经查M69032(19)、(18)脚接地电容击穿,更换同型号电容后故障机修到这里,终于修好值得探讨。。 |
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