In a conference site, the audio frequency export device is TV, but customer reflects that the image is obvious but no audio, or the audio can be heard but no image
1.Confirm device normal before.
2. Making audio frequency path as local loopback, and the phenomenon still exists. Confirming that devices connection have problem.
3.Ceceking the connection of audio/video frequency import and export. Finding that TV audio frequency import is path 1but video frequency import is path 2. Matching they, then trouble shooting.
Customer often plays VCD on TV, and the selecting of TV audio frequency path and TV video frequency path is not matching when plugging interfaces frequently. So leading to this result.