| 故障表现为：灯亮不开机 分析与检修：通电试机灯亮不开机，测电压待机3.3V正常，测L004无5V 电压，测L004对地电压短路，挑开L004后极正常，故障应该在Q004和U005上，试着先换Q004 ,D13N3LT,上电测试5V正常，焊好L004后开机一切正常。 |
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