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一台 TCL 2518E 型彩电,显示“电网电压高于270V,请关机”字样,几秒钟后“自动关机”。用万用表实测电网电压为230V,说明该机电网电压自动检测电路存在故障而误动作。该机设有电网电压自动检测及保护功能电路(见图1)。在正常使用时,按“显示”键可显示实测电网电
A TCL 2518E-type color TV, shows “grid voltage is higher than 270V, please turn off ” words, a few seconds “Auto Power Off ”. Measured with a multimeter network voltage 230V, indicating that the machine network voltage automatic detection circuit malfunction and malfunction. The machine has a grid voltage automatic detection and protection circuit (see Figure 1). In normal use, press “Display ” key to display the measured grid power