西门子840D数控系统维修故障包括：维修故障包括：按键损坏，电源板故障、高压板故障，液晶故障、主板坏、上电黑屏、 花屏、暗屏、触摸失灵，不能正常开机、触摸问题、按键问题、屏幕显示问题（屏碎、花屏、白屏、黑屏等）、通讯问题（触摸无反应、触摸反应慢等）、电源故障、主板问题、系统问题等 工控机无法安装操作系统；工控机按下开关，可以看到指示灯亮，但屏幕无显示；工控机开机屏幕出现英文或数字报错 西门子伺服电机
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