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故障一:不开机,红灯亮分析与检修:将控制盒与显示屏同时插上电,各自红灯均亮,按“遥控开机”键和“频道加/减”键开机均无任何反应,指示灯颜色不变。拆开显示屏背盖,测电源电路输出连接器CZ3的“ON/OFF”端有开机5 V电压,而12 V、24 V端上无输出,测量开/关机控制电路Q302、Q303的b极均无0.7 V电压,检查b极控制电路,发现R324接b极的一端无电压,而接连接器
Fault 1: Do not turn on, red light analysis and maintenance: the control box and display at the same time plug in the electricity, their red lights are bright, press the “remote boot ” button and “channel plus / minus ” button boot No reaction, the same color lights. Open the display back cover and measure the 5 V voltage on the “ON / OFF” terminal of the CZ3 output connector of the power supply circuit and no output on the 12 V, 24 V terminals. Measure the ON / OFF control of the Q302, Q303 b extremely 0.7 V voltage, check the b pole control circuit and found that R324 then b-pole voltage without the end, and then connector