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许多维修人员在遇到主电源电压下降到标准值的50～80％时,常去掉行负载接上假负载来检修。在许多次维修中笔者发现,只要遇到电视机主电源电压为标称值的50～80％时,拔下偏转线圈(行、场均拔下),就可快速判断故障所在部位:若拔去偏转线圈后再开机测得主电压+B恢复止常.说明是偏转线圈仔在局部短路;若拔下偏转线圈后主电压不能恢复,便可重点检查行输出变压器与开关电源本身,便可重点检查行输出变压器与开关电源本身。下面是笔者在检修中遇到的几个例子,供同行参考。
Many maintenance personnel in the face of the main power supply voltage dropped to 50% of the standard value of 80%, often go to the wrong line load connected to overhaul. In many repairs, I found that as long as the TV main power supply voltage of 50 to 80% of the nominal value, unplug the deflection coil (line, the field were unplugged), you can quickly determine the location of the fault: pull Go to the deflection coil and then boot the measured main voltage + B to restore the normal. That is the deflection coil Aberdeen in the local short circuit; if the main voltage unplug the deflection coil can not be restored, we can focus on line output transformer and switching power supply itself, you can focus Check the line output transformer and the switching power supply itself. The following is the author encountered in the maintenance of a few examples for peer reference.