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该机主要由微处理器TMP87CX38、TV小信号处理电路TB1238N、存储器AT24C04和电源集成块TDA4605组成。电路外围元件虽少,但控制保护电路较多,维修前必须认真分析。 1.开关电源故障导致“三无”该机指示灯亮,说明电源基本正常,经检测+B为110V,正常。但TDA4605块有多种保护:(1)过低压、过载保护。+300 V通过R916(680kΩ)与R920(20kΩ)
The aircraft mainly by the microprocessor TMP87CX38, TV small signal processing circuit TB1238N, memory AT24C04 and power supply block TDA4605 composition. Although the circuit peripheral components, but more control and protection circuits, maintenance must be carefully analyzed. 1. Switching power supply failure led to “three no” The machine lights, indicating the basic normal power supply, the detection of + B is 110V, normal. However, TDA4605 block has a variety of protection: (1) low voltage, overload protection. +300 V through R916 (680kΩ) and R920 (20kΩ)