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由于I2C总线系统的故障检测几乎涵盖了整个电视机的所有被控电路,保护电路检测的范围较大;另外,当总线系统发生故障或软件数据发生故障时,也会引起保护电路动作;再加上保护信息是通过总线系统传输的,其传输的信息是脉冲信号,其信号因机型和软件程序而异,无法像分立元件保护电路和微处理器中断口保护电路那样通过电压和波形的测量获取故障部位信息,因此,对总线系统保护故障的检修与传统遥控彩电有较大的区别。根据总线系统的电路特点,可采用以下方法进行检修。一、观察故障现象,摸索保护规律对I2C总线系统的保护性停机,由于彩电晶牌、机型不同,使用的微处理器或控制软件不同,保护时的故障特征也不相同。
Since the fault detection of I2C bus system covers almost all the controlled circuits of the entire television set, the detection range of the protection circuit is large. In addition, when the bus system fails or the software data fails, it also causes the protection circuit to operate. On the protection of information is transmitted through the bus system, the transmission of information is a pulse signal, the signal due to the model and software programs vary, not as discrete component protection circuit and the microprocessor interrupt port protection circuit through the voltage and waveform measurements Get the information of the fault location, therefore, the maintenance of bus system fault protection and remote control TV have a greater difference. According to the bus system circuit characteristics, the following methods can be used for maintenance. First, observe the phenomenon of failure, explore the protection of the I2C bus system protective shutdown, due to the color TV crystal, different models, the use of microprocessor or control software, the protection of the fault characteristics are not the same.