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一台金星 C4 730 A彩电开机三无 ,待机指示灯亮 ,按遥控器及机身任何键均无反应。一、故障分析与判断根据故障现象分析 :该机交流供电及辅助电源正常 ,故障涉及开关电源、扫描电路、控制系统、保护电路。二、检查与测量1、开关电源部分测量开关电源部分 C72 3两端电压 (正常为
A Venus C4 730 A color TV boot three no, the standby indicator light, press the remote control and the body no response any key. First, failure analysis and judgment According to the breakdown phenomenon analysis: This machine exchanges the power supply and the auxiliary power supply normal, the breakdown relates to the switch power source, the scanning circuit, the control system, the protection circuit. Second, the inspection and measurement 1, part of the switching power supply measurement switch power supply section C72 3 voltage across (normal