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例1 故障现象:屏幕画面上出现一条垂直亮线分析与检修:显示器一般都采用集成电路TDA1170N或TDA1675A做场扫描电路。集成片TDA1170N有12脚,分列两边,但每边六只脚又不是整齐排列的,而是成三角分布的,集成块的中间部分是一片散热片。TDA1170N的②脚接工作电源,④脚输出场扫描电流,⑨脚接定时元件。集成块TDA1675是(15)脚单列式,但又分为单、双两列,它的(14)脚接工作电源,①脚输出场扫描电流,④、⑥脚接定时元件。两个集成块的⑦脚都是场幅度调节控制端。在电路上,两种集成
Example 1 Symptom: A vertical bright line appears on the screen. Analysis and Overhaul: The display usually adopts the integrated circuit TDA1170N or TDA1675A to make the field scanning circuit. Integrated chip TDA1170N 12 feet, divided into two sides, but each side of the six feet are not neatly arranged, but in a triangular distribution, the middle of the manifold is a heat sink. TDA1170N ② feet connected to the power supply, ④ feet output field scanning current, ⑨ pin connected to timing components. The integrated block TDA1675 is (15) feet single column, but is divided into single and double columns, its (14) feet connected to the power supply, ① foot output field scanning current, ④, ⑥ foot timing components. The feet of both blocks are the field amplitude control terminals. On the circuit, two kinds of integration