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无光栅、无伴音、无图像(以下简称“三无”)故障是彩色电视机最常见的故障现象,其典型故障源所涉及的电路范围一般在以下五个方面。 1.主开关电源电路不工作或电源负载电路出现过流或短路,致使主开关电源工作异常 主开关电源向整机提供电能,若这部分电路不工作或工作异常引起输出的直流电压异常,整机信号通道与显像管将均不工作或工作异常,整机自然也就不能正常工作。
No grating, no sound, no image (hereinafter referred to as “three no”) is the most common failure of color TV failure phenomenon, the typical fault sources involved in the circuit generally in the following five areas. 1. The main switch power supply circuit does not work or the power load circuit appears overcurrent or short circuit, resulting in the main switch power supply abnormal work. The main switch power supply to the machine to provide power, if this part of the circuit is not working or abnormal output DC voltage anomalies, the whole Machine signal channel and picture tube will not work or abnormal work, the whole machine naturally can not work properly.