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故障现象:开机可听到行频启动声,电源指示灯亮,但无光栅、无伴音。按下遥控器“待机”键也不起作用,触模显像管有静电感应,机器在使用中呈现“黑屏”现象。分析与检修:打开机器后盖,检测开关电源+B端对地电阻,无短路现象。断开行负载L906,在C922处并接100W灯泡,开机灯泡亮,+B电压为110V左右(正常+B/135V),开关电源其他各组电压基本正常。
Symptom: boot line frequency can be heard to start sound, power indicator light, but no grating, no sound. Press the remote control “standby ” button does not work, touching the picture tube has electrostatic induction, the machine presents “black screen ” phenomenon in use. Analysis and Maintenance: Open the machine back cover, switch + B power switch to ground resistance, no short circuit. Turn off the line load L906, connect the 100W bulb at C922, turn on the light bulb, and the voltage of + B is about 110V (normal + B / 135V). The voltages of other groups in switching power supply are basically normal.