故障现象 :图像质量差 ,有“鬼影干扰”且满屏有回扫线。此前在干线底下发生一次火灾 ,当时维修人员去现场维修时 ,只是把烧坏的分支和部分从外表看不好的电缆切断更换 ,恢复信号后 ,图像还能看 ,但过了一段时间就出现上述现象。故障分析 :顺着着火点继续向前查看 ,在距离着火 Symptoms: poor image quality, there is “ghosting interference” and the full screen with a retrace line. Previously a fire broke out under the trunk line. At that time, when maintenance personnel went to the site for maintenance, they only switched off the burnt out branches and some cables that looked bad from the outside. After the signal was restored, the images could still be seen but over time The above phenomenon. Failure Analysis: Follow the ignition point to continue to look forward, at a distance of fire