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故障现象:开机,无图像、无伴音。出现此类故障时,首先检测TNBl01的BP、BM端有无+5V电压,BT端有无+32V电压。若TNRl01BT端电压低于+32V,则说明升压电路未工作,可用示波器检测N504(NE555)的③脚有无方波驱动脉冲。若有,则检查耦合元件C514、R507、振荡管V503(2SC2120)、储能电感L503是否损坏。若N504(NE555)的③脚无
Symptoms: boot, no images, no sound. In the event of such a failure, the first test TNBl01 BP, BM + 5V terminal voltage, BT terminal +32 V voltage. If the TNRl01BT terminal voltage is lower than + 32V, then the boost circuit is not working, the oscilloscope can detect the N504 (NE555) ③ pin with square wave drive pulse. If so, then check the coupling element C514, R507, oscillation tube V503 (2SC2120), storage inductor L503 is damaged. If N504 (NE555) ③ feet without