Consider to upgrade to CN firmware. But, it may be danger. You decide.
This seems to be your problem ?
2、在菜单设置->视频设置 -> 3D 设置,增加" HDMI 2白屏",当HDMI 1输出3D视频时,强制HDMI 2输出2D 白屏;解决了先前有用户反映,如果HDMI 1连接3D电视,HDMI 2连接2D接收器,且此接收器和HDMI 1连接同一台电视时,播放3D电影,接收器将会无声的情况;