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5.长虹A6机芯(A2118)维修实例实例一:开机“三无”,指示灯亮。分析与检修:指示灯亮,说明5V遥控电源正常,经检查,5V电源确实正常,而电源其他输出电压均无。一般来说,这是电源电路没有工作所造成。又测C507两端电压为+300V(正常),说明开关电源没工作。按遥控器“POWER”键,测LC864512⑦脚电压,有0～4.2V变化,又测V576集电极电压无变化。将V576断开,然后进行短时间强制开机,测+B1电压为
5 Changhong A6 movement (A2118) Example of a maintenance example: boot “three no”, the indicator light. Analysis and Maintenance: Indicator light, indicating normal 5V remote power supply, after checking, 5V power supply is indeed normal, and the power of the other output voltage none. In general, this is caused by no work on the power circuit. Also measured C507 both ends of the voltage is +300 V (normal), indicating that the switching power supply did not work. Press the “POWER” button of the remote control to measure the voltage of LC864512 ⑦ pin, there is 0 ~ 4.2V change, and no change of V576 collector voltage. V576 will be disconnected, and then for a short time forced boot, measured + B1 voltage is