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故障现象:开启总电源开关,电源指示灯亮,但无光栅和声音,如同未开机一样,手触荧光屏无高压吸附感觉。据用户说:“有时工作正常,有时不能开机”。分析与检修:打开机壳检查,发现行扫描电路、开关电源电路、视放电路等都已拆焊过,也换过部分元件,显然没查出故障原因,并没有根除机器原有毛病。打开主电源开关,发现显像管灯丝亮,测加速极电压正
Symptoms: Turn on the main power switch, the power indicator light, but no grating and sound, as did not boot the same touch screen without high pressure adsorption feeling. According to the user said: “sometimes work properly, and sometimes can not boot.” Analysis and Maintenance: Open the case check and found that the line scan circuit, switching power supply circuit, as the circuit has been demolished, but also replaced some of the components, apparently did not find the cause of the malfunction, and did not eradicate the original problems of the machine. Turn on the main power switch and found the picture tube lamp is bright, measuring acceleration pole voltage is positive