论文部分内容阅读
故障现象:声音正常,但无图像,关机瞬间屏幕中间出现一条水平亮线。分析与检修:关机瞬间有水平亮线,说明是场幅控制电路IC401(TDA3654)部分发生故障,更换IC401后,图像基本恢复正常,但屏幕的上部约占垂直方向的1/8,有细密的水平亮线。开机几分钟后,屏幕上部分的水平细密亮线自动
Symptoms: the sound is normal, but no image, shut down the moment the screen appears a horizontal bright line. Analysis and Overhaul: Shut off the moment there is a level of bright line, indicating that the field amplitude control circuit IC401 (TDA3654) part of the failure to replace the IC401, the image returned to normal, but the upper part of the screen about the vertical direction of the 1/8, a fine Bright horizontal line. A few minutes after turning on the screen, the horizontal fine lines on the screen automatically