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故障现象:一台 SUNSHINE PW448型彩色显示器,加电无显示,电源指示灯不亮,机内也无任何声响。分析检修:根据故障现象分析,重点怀疑电源电路部分有问题。拆开机壳,检查保险丝及元件无任何烧坏迹象。加电测 C808主滤波电容两端有300V 的直流电压,说明整流滤波电路正常。再检查开关变压器 T801初、次级绕组均无电压输出,初步判断电源振荡
Symptom: A SUNSHINE PW448-type color monitor, no power display, the power light does not shine, the machine has no sound. Analysis and Maintenance: According to the analysis of the phenomenon of failure, the key suspect part of the power supply circuit problems. Open the case, check the fuse and components without any signs of burning. Power test C808 main filter capacitor at both ends of the DC voltage of 300V, indicating rectifier filter circuit is normal. Then check the switch transformer T801 primary and secondary windings are no voltage output, initially determine the power supply oscillation