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十五、彩电开关电源精修5例例1 机型:黄河HC47—1型故障现象:工作中无规律自动关机。关机后再开机又能工作一段时间,一会儿又自动关机。分析检修:该机采用东芝X56P机芯,自动关机是该机芯开关电源的常见故障。原因是电源输出电压升高或保护电路故障引起保护电路中的可控硅动作。开机后监测开关电源的输出电压为124V(正常值为114V),已达到保护电路动作(125V)的临界电压
Fifteen, color TV switching power supply refined 5 Example 1 Model: Yellow HC47-1-type Fault phenomenon: Work without law automatically shut down. Power off and then boot can work for some time, and then automatically shut down. Analysis and maintenance: The machine uses Toshiba X56P movement, automatic shutdown is the common failure of the movement switching power supply. The reason is that the output voltage of the power supply rises or the protection circuit fails to cause the silicon controlled rectifier in the protection circuit. After switching on the monitor, the output voltage of the switching power supply is 124V (normal value is 114V), and the critical voltage of the protection circuit (125V) has been reached