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机型:康佳T2986A型彩电故障现象:无光栅、无字符、无伴音,面板上的红指示灯亮,开机瞬间有“咝咝”的启动声。分析与检修:用万用表检测“行管”集电极电压为0V,但开机瞬间有很小的电压,保护管V912控制极有电压,仔细检查与V912控制极相关的电阻R928阻值变大,换新后,故障排除。机
Model: Konka T2986A color TV Fault phenomenon: no grating, no characters, no sound, the red indicator light on the panel, the boot moment, “咝 咝” start sound. Analysis and Overhaul: Use a multimeter to detect “line tube” collector voltage is 0V, but the boot moment has a small voltage protection tube V912 control voltage, carefully check the V912 control electrode resistance R928 resistance larger, change New, troubleshooting. machine