彩电屏幕上产生回扫线的故障原因有很多,根据故障现象大致可分为二种:一种是全屏幕回扫线故障;另一种是屏幕上出现几条或几十条回扫线故障。全屏幕回扫线故障主要是场消隐信号没有加到显像管的阴极上,使电子束在场逆程期间得不到消隐所造成的。屏 There are many reasons for the failure of the flyback line on the color TV screen, which can be roughly divided into two types according to the failure phenomenon: one is the failure of the full screen flyback line; the other is the failure of several or tens of flyback lines on the screen . Full-screen flyback fault is mainly the field blanking signal is not added to the CRT cathode, so that the electron beam during the absence of vertical blanking caused by the blank. Screen