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例1 机型:东芝2500XH多制式彩电故障现象:无光栅、无伴音。检修过程:根据故障现象,说明开关电源或行扫描电路有故障。打开机壳,发现F_(801)交流保险管熔断,在检查整流滤波电路,开关管和行输出等电路,没有短路的情况下,更换F_(801),开机又被熔断。由于该机电源电路比较特殊,为了适应不同的电网电压,特设计了110V与220V自动切换电路。为了区别故障在自动切换电路(包括整流及保护电路)还是在开关电源及负载电路,先将开关管的供电断开,然后重新加电,保险管
Example 1 Model: Toshiba 2500XH multi-system color TV Symptom: No grating, no sound. Maintenance process: According to the fault phenomenon, indicating the switching power supply or line scan circuit fault. Open the case and found F_ (801) fuse fuse, check the rectifier filter circuit, switch and row output circuit, without short circuit, the replacement F_ (801), the boot is blown again. As the aircraft power supply circuit is rather special, in order to adapt to different grid voltage, specially designed 110V and 220V automatic switching circuit. In order to distinguish the fault in the automatic switching circuit (including rectifier and protection circuit) or in the switching power supply and load circuit, the first switch off the power supply, and then re-power, fuse