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2.电源与保护电路维修技巧根据以上原理,开关电源初级保护电路保护时,迫使开关电源停止振荡,开关电源无电压输出;电源失压检测和晶闸管保护电路与开/关机电路相连接,其保护被控电路是主开关电源,保护时与待机状态相似,也会造成开关电源无电压输出。如果开机后有开机的声音和反映,未进行遥控待机操作,电视机自动关机,进入待机状态,即可判断是保护电路工作,进入保护状态。(1)判断是否进入保护状态由于保护时采取关断主开关电源的方法,如果开机的瞬间有+B电压输出,然后降为0 V,电源指示灯和开机指示灯同时点亮,即可确定是进入保护状态;同
2. Power supply and protection circuit repair skills According to the above principles, switching power supply primary protection circuit protection, forcing the switching power supply to stop oscillation, switching power supply voltage output; power loss detection and thyristor protection circuit with the on / off circuit connected to its protection Controlled circuit is the main switching power supply, protection and standby state is similar, will also result in switching power supply voltage output. If the boot has a boot sound and reflection, not remote control standby operation, the TV automatically shut down, enter the standby mode, you can determine the protection circuit is working, enter the protected state. (1) to determine whether to enter the protected state As the protection of the main switch off the power switch method, if the boot moment + B voltage output, then dropped to 0 V, the power indicator light and power indicator light at the same time, you can determine Is to enter the state of protection; with