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故障现象:开机后有伴音,无图像,光栅很亮不可调并满屏回扫线。分析与检修:由现象分析,故障一般发生在视频输出电路,又因光棚不偏色并有回扫线故怀疑基色输出电路工作失常,而使三基色的各输出管均不工作而至。因此重点检查基色输出电路的各工作点电压。经测量发现各管的集电极电压都为3 0V(正常值应为1 3 0V),这就是故障所在。因此电压的偏低导至G.B.R
Symptom: There is sound after boot, no image, the grating is very bright and can not be adjusted and full screen flyback line. Analysis and Maintenance: From the phenomenon of analysis, the fault usually occurs in the video output circuit, and because the light shed is not color cast and flyback line so the suspect primary output circuit malfunction, leaving the three primary colors of the output tube are not working. Therefore, check the primary color output circuit of the operating point voltage. After the measurement found that the collector voltage of each tube is 30V (normal value should be 130V), and this is where the fault. Therefore, the low voltage led to G.B.R.