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上电后，连接到PC端，DMD显示屏没有反应，GUI显示：Error:Invalid controller/DMD 状态一直是standby，单击normal后，马上又跳回standby了，请问下这是怎么回事。
通车这种情况是主板和dmd小板连接，或dmd小板出现故障。或dmd不良或dmd没有安装好。就是主板没有检测到dmd.
