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TV/AV切换电路一般是由模拟开关集成电路加少量外围元件组成,由本机微电脑输出切换指令,通过三极管驱动模拟开关集成块内部的电子开关来实现TV和AV信号的切换,以适应不同的输入或输出需求。目前,中小屏幕彩电的TV/AV切换电路大多数采用TC4053、TC4066、TDA8440等集成块作为模拟开关。这几种集成块内部电路简单,只是几组单纯的电子开关,损坏后可以用短接有关引脚的办法来直接判断,并可使用机械开关代换集成块内部的电子开关做
TV / AV switching circuit is generally composed of a small number of external analog switches integrated circuits and components, the output of the local microcomputer switching instructions through the transistor-driven analog switch integrated circuit within the electronic switch to achieve TV and AV signal switching to adapt to different Enter or export demand. At present, the TV / AV switching circuit for small and medium-screen TVs mostly uses integrated blocks such as TC4053, TC4066 and TDA8440 as analog switches. These kinds of integrated circuit internal circuit is simple, just a few groups of pure electronic switches, damaged after the method can be used to short-circuit the judge directly, and can use the mechanical switch to replace the integrated block internal electronic switch do