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例6长虹CHD34166彩电(CHD-7机芯),出现不规则的横条纹干扰。分析与维修:图像出现干扰,一般由开关电源、行扫描电路、中频单元、数字板及其他相关电路引起。为准确判断故障部位,可先将射频信号线拔掉,观察屏幕上显示的光栅,若无干扰条纹出现,说明开关电源及扫描电路无故障。为进一步确认故障是发生在中频单元,还是在数字板处理单元或其他相关电路,输入AV视频信号进行观察,发现画面出现条纹干扰,且呈扭曲状。这说明该故障与中频信号处理电路(集成在
Example 6 Changhong CHD34166 color TV (CHD-7 movement), the emergence of irregular horizontal bar interference. Analysis and Maintenance: Image interference occurs, usually caused by switching power supply, line scan circuit, IF unit, digital board and other related circuits. To accurately determine the fault location, unplug the RF signal line first, observe the grating displayed on the screen, and if no interference fringes appear, the switching power supply and the scanning circuit are fault-free. To further confirm whether the fault occurs in the IF unit, or in the digital board processing unit or other related circuits, input the AV video signal and observe that there is a fringe pattern in the picture. This shows that the fault with the IF signal processing circuit (integrated in