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1、故障现象:NECPC9800彩显电源指示灯亮,但无光栅.分析与检修:开显示器电源,用手摸显示屏,没有高压反应(嘶啦声),可能是行输出部分有问题.断电打开显示器外壳,电源部分与主板为一体,测量电源输出在107V左右,测量行输出管集电极电压为90V,基本正常.这时发现灯丝不亮,用万用表交流档测显像管9、10脚无灯丝电压.断电测灯丝供电电阻,这是一个
1, Symptom: NECPC9800 color display power indicator light, but no grating Analysis and Maintenance: Open the monitor power supply, touch the display, no high voltage response (cries sound), the output may be part of the problem. Monitor shell, the power part of the motherboard as a whole, measuring the power output of about 107V, measuring the output tube collector voltage is 90V, basically normal. Then found the filament does not shine, with a multimeter AC file to detect the picture tube 9, 10 feet without filament voltage Power off the filament supply resistance, this is one