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Yingtai H81MLC power on auto power off repair
Yingtai h81mlc powered on auto power off and found the cause of the fault, so LM324 10PIN was connected to Q1, and Q1 controlled pin to connect with Q2.Q2 is connected with Q3, Q2 is already at high potential. After replacing Q2 directly, Q1 control pin is normal,booting up is finished.