故障:热机自动关机 维修分析:热机自动关机,将板装在机器上测试观察,果然热机后自动待机,开机测U2 3.3V U3是2.5V正常测试是 2.6V的正常, U4 1.2V 各组电压正常,自动关机后这些电压也是有的,换软件,故障依旧,经以上判断怀疑是U12 MST6M181VS 处理IC不良造成的,更换U12 MST6M181VS,开机测试观察,故障再没有出现. |
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