长虹NC-3机芯彩电I^2C总线的检修

Inspection on Changhong NC-3 Chip I^2C Bus Color TV

现在的新型大屏幕彩电,CPU对大部分电路都是通过I2C总线系统控制,与传统的遥控彩电相比,其总线系统对整机的控制原理发生了变化,检修方法也相应改变,一旦发生故障,使用传统的经验和思路已无法检修故障。为探索彩电I2C总线的检修规律,本文以C2919D型机为例,分析其总线系统的结构、故障分析和检修方法,通过列举典型的故障现象和检修实例,总结出彩电I2C总线系统普遍适用的检修方法。

A new type of super color TV has come into being, in which CPU commands the most of circuits through the I^2C bus system. Compared with the traditional remote-controlled color TV, The principles under the control of bus system have altered and therefore the inspection and repair work must go with it.Once a failure occurs, It is impossible to locate the faults by using traditional experience and paths. To generate the principle on inspecting I^2C bus color TV, this essay analyzes the structure of the system, the cause of the failures and the methods of the inspection based on the Type C2919D. By listing typical failures and giving real examples, it sums up some universal and practical metheds on spectation.