| 故障表现为：三无 检修及分析：先修3.3V换U801,R813，R814后开机，C815冒烟立刻关机，保险丝烧断，D815，D816，D802二极管都击穿，换之3.3V正常。C815/10UF电容易损坏，如不注意更换，开机时间长再次烧U801等元件，请注意。 |
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