厦华XT-7128T彩电微处理器采用KY88C94,亮度、色度、扫描小信号处理电路采用TA8759AN。该机设有:电源失压、欠压检测保护和行、场输出过压检测保护电路。一、保护电路工作原理厦华XT-7128T彩电(如图1所示)设有两套保护系统:一是依托开/关机电路设计的低电压失压、欠压保护电路。发生故障时,开/关机电路动作,切断主电 Prima XT-7128T color TV microprocessor KY88C94, brightness, color, scanning small signal processing circuit using TA8759AN. The machine has: power loss, undervoltage detection and protection and line, field output overvoltage detection and protection circuit. First, the protection circuit works XORA XT-7128T color TV (Figure 1) has two sets of protection system: First, relying on the open / shut down circuit design of low-voltage voltage loss, undervoltage protection circuit. When a fault occurs, the on / off circuit is activated and the main power is cut off