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例1 机型:创维2122(3Y20机芯) 故障现象:自动选台时图像一闪而过,不能存台分析检修:用手动调台将图像调到最佳时出现伴音(音杂),这时测解码芯片LA76810的(48)、(49)脚VCO振荡中周电压为4.2V(正常),进入工厂菜单查看数据,正常,怀疑同步识别信号有问题。该机行同步识别信号是从LA76810的(22)脚输出送到CPU的(33)脚(见图
Example 1 Model: Skyworth 2122 (3Y20 movement) Symptom: Image automatically flashes through the screen when the election, can not be stored in the analysis Analysis and maintenance: Manual tune the image to the best when there is sound (sound), this Time measurement decoder chip LA76810 (48), (49) pin VCO oscillation in the weekly voltage of 4.2V (normal), enter the factory menu view the data, normal, suspected synchronization identification signal problems. The machine line synchronization identification signal from the LA76810’s (22) pin output to the CPU (33) feet (see figure