| 故障表现为：不读U盘 维修与分析：开机测试USB2好用.USB1不读U盘.测量USB1接口电压.供电正常.DP,DM脚正常2.5V到3.2V电压为0V.检查外围元件.发现R257,R256-4.7欧姆有装,加上同样阻值电阻,试机故障机修到这里，终于修好值得探讨。. |
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