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东芝2500XH型大屏幕彩电开机出现无光栅、无图像、无伴音故障时,应首先测开关电源输出电压145V是否正常。若145V电压正常,则故障由行扫描电路引起;若145V电压降为60～80V,则故障由遥控关机电路引起;若145V电压变为OV,则是开关电源电路本身出现故障。检修实例1 首先测主电源输出电压,如图1,即C_(833)两端电压,测得为OV,可判断故障在开关电源电路。接着测电源整流输出电压,即C_(818)、C_(819)两端的电
Toshiba 2500XH large-screen color TV boot there is no grating, no images, no sound failure, the first test should be measured whether the power switch 145V output voltage is normal. If the 145V voltage is normal, the fault is caused by the line scan circuit; if the 145V voltage drop is 60 ~ 80V, the fault is caused by the remote shutdown circuit; if the 145V voltage becomes 0V, the switching power supply circuit itself is faulty. Maintenance Example 1 First test the main power output voltage, shown in Figure 1, that is, C_ (833) both ends of the voltage, measured as OV, can determine the fault in the switching power supply circuit. Then measured power rectifier output voltage, that C_ (818), C_ (819) the two ends of the electricity