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海信TC-2953、TC-2955、TC-2965、TC2958系列彩电,小信号处理电路采用三洋单片小信号处理电路LA7687A,微处理器采用LC864516-5G18,开关电源采用常见的三洋A3型由分立元件组成的开关电源。该系列彩电微处理器设有保护专用端口,具有过流、失压保护功能,当开关电源、行输出、场输出等电路发生短路、过流、失压等故障时,均会进入待机保护状态。下面以海信TC2953彩电为例,介绍保护电路的原理与维修。
Hisense TC-2953, TC-2955, TC-2965, TC2958 series of color TV, small signal processing circuit using Sanyo single-chip small signal processing circuit LA7687A, microprocessor using LC864516-5G18, switching power supply using the common Sanyo A3-type discrete components Composition of the switching power supply. The series of color TV microprocessors with a dedicated port for protection, with overcurrent, loss of voltage protection, when the switching power supply, line output, field output circuit short circuit, over current, voltage loss and other failures, will enter the standby protection state . The following Hisense TC2953 color TV, for example, describes the protection circuit principle and maintenance.