论文部分内容阅读
一台赣新牌C5416型彩电,有时不能启动,启动后若接收无线电视信号能正常工作,若接收有线电视信号就会出现类似+300V电源滤波不良的行扭动现象,伴音中有较强的交流声。接收无线信号正常而插入有线信号时失常说明故障很可能出在机芯冷、热地之间的隔离电路上。查冷、热地之间的跨接电容正常,电阻也正常,更换光电耦合器TLP651后,不再出现上述故障。
A Jiangxi new card C5416-type TV, and sometimes can not be activated, if the start receiving wireless TV signal to work properly, if you receive a cable signal will appear similar +300 V power supply filter bad twist phenomenon, sound stronger Exchange sound. Receive wireless signal is normal and plugged into the wired signal is abnormal when the failure is likely to be in the movement between the cold and hot ground isolation circuit. Check cold, hot ground between the normal capacitance, resistance is also normal, optocoupler TLP651 replacement, the above problems no longer occur.