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雷击进入彩电的途径有三路:一是从电网进入电视机内,即使电源开关在关断位置,如果插头未从电源插座上拔下,雷电仍会进入机内;二是从室外天线或有线电视传输线进入机内;三是从电源及高频头同时进入机内。一、雷电从电网进入机内由于开关电源有300V大滤波电容存在,可对雷电所产生的脉冲电流进行释放,这时AC220V进口处由LC组成的低通滤波器;(电容炸裂、电感多在铜线与引脚焊接处击断),四只桥式整流二极管及保险管损坏首当其冲,而300V滤波电容本身很少有损坏。对于变压器并联型开关电源,开关变压器又可
Lightning into the TV there are three ways: First, from the grid into the TV, even if the power switch in the off position, if the plug is not unplugged from the power outlet, lightning will still enter the machine; Second, from the outdoor antenna or cable television Transmission line into the machine; Third, from the power and high-frequency head into the machine at the same time. First, the lightning into the machine from the grid Switching power supply has a 300V filter capacitor exists, the pulse current generated by the lightning can be released, then imported AC220V LC by the low-pass filter; (capacitance burst, the inductance of more Copper and pin welding at the break), four bridge rectifier diodes and fuse damage bear the brunt, and 300V filter capacitor itself is rarely damaged. For the transformer parallel switching power supply, switching transformer can be