It seems that the audio codec used to record onto the AVI is not supported by your TV. I would suggest taking a short AVI clip, encode it with different audio codecs, and see which one works best. I personally don't have the audio codecs that can be used, just the video ones, so this would probably be your best bet to find the one that should be used.
I recently installed PC Share Manager on my PC and have media streaming to my Samsung LCD TV. It seems as if my AVI files that I have created through my Canon digital camera have issues with their audio tracks when streamed onto my tv. The video itself plays on the tiv but the audio is not supported and an error message appears on my tv when plyaing these AVI files. Has anyone come up with a resolution to this problem?