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故障现象:开机有“唧唧”叫声,无图像、无伴音,无光栅,即“三无”。分析与检修:首先测量主电源+115V,大约为+130v,说明电源电路已经起振,开始工作。哪是行电路没有起振?还是因为行电路或者其他电路有故障,使行电路保护而停振呢?测量主电源输出端,开机时没有过流现象,所以很可能是行电路没有工作,开关电源因没有行脉冲同步,使电源的振荡频率偏低,从而产生“唧唧”的叫声。由于行输出电路没有工作,负载太轻,所以输出电压偏高,因此重点检查行振荡、行激励
Symptoms: Boot has “chirp” sounds, no images, no sound, no grating, that is, “three no.” Analysis and Maintenance: First measure the main power + 115V, about + 130v, indicating that the power supply circuit has started to start working. Which line is the circuit is not vibrating? Or because the line circuit or other circuit failure, so that the line circuit protection and stop vibration it? Measure the main power output, there is no over-current boot phenomenon, so it is likely that the line circuit does not work, the switch Because there is no line pulse power synchronization, the power of the oscillation frequency is low, resulting in “chirp” sound. Due to the line output circuit is not working, the load is too light, so the output voltage is high, so the focus of inspection line oscillation, line excitation