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故障现象 主机屏幕显示器光栅灰白,调节对比度旋钮无反应,亮度调节范围变小。面板上的各控制键无效。显示器上字符数字不清楚,且无超声图象。9英时监视器光栅正常,但无超声图象(该故障在主机出现故障之前已存在)。显示器故障现象经历了一个变化过程,故障出现,轻拍外壳消失;故障再次出现,轻拍外壳无效。 分析与检修 由于显示器所显示的故障现象具
Symptom Host screen display grating gray, adjust the contrast knob no reaction, the brightness adjustment range becomes smaller. Each control panel on the panel is invalid. The number of characters on the display is unclear and there is no ultrasound image. The 9-inch monitor raster is normal but no ultrasound image (the fault existed before the host failed). Display failure phenomenon has undergone a change process, the fault appears, the tapping shell disappears; the fault appears again, tapping the shell is invalid. Analysis and troubleshooting due to the display of fault phenomena