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故障现象:开机“三无”。出现此类故障时,首先试用遥控器开/关机,观看指示灯变化情况;若指示灯亮/暗变化,说明遥控供电+5V及开/关机控制基本正常,则用万用表测量开关电源各组电压是否正常;若均为OV,说明开关电源未工作,此时检测电容C516(220μF/400V)电压是否正常;若该电容两端无+280V电压,但交流滤波电路电压正常,则检查如图1所示相关电路元器件是否有问题。
Symptoms: boot “three no ”. If such a fault occurs, try the remote control on / off to see the change of the indicator light. If the indicator light is on or dark, it indicates that the remote control power supply is + 5V and the on / off control is basically normal. Normal; if OV, indicating that the switching power supply is not working, the detection capacitor C516 (220μF / 400V) voltage is normal; if the capacitor is not + 280V voltage across the two sides, but the AC filter circuit voltage is normal, then check Figure 1 Show the relevant circuit components are there any problems.