9000系列终端只显示华为Logo，不显示图像的原因和方法：
该问题一般出现在HD OUT 2接口输出上。HD OUT 2接口默认输出设置仅勾选“显示H.239”，当无演示视频源输入的时候，就会显示华为Logo。
修改方法：
在遥控器操作界面，选择“设置 > 视频 > 输入输出 > 视频输出 > HD OUT 2”，勾选“显示本地主流”、“显示远端主流”、“显示H.239”后，当无演示视频源输入时，入会前默认输出本地主流，入会后输出远端主流。
若仍不能解决该问题，通过Telnet登录终端，执行命令config savestartupview switch:0即可。 This problem generally occurs on the output of the HD out 2 interface. The default output setting of HD out 2 interface is only checked "display H.239". When there is no demo video source input, Huawei logo will be displayed.

Modification method:

In the remote control operation interface, select Settings > Video > I / O > video output > HD out 2, check show local mainstream, show remote mainstream, and show H.239. When there is no video source input for demonstration, the local mainstream will be output by default before entering the meeting, and the remote mainstream will be output after entering the meeting.

If the problem still cannot be solved, log in to the terminal through telnet and execute the command config savestartupview switch: 0.