The first thing that comes in my mind is the AV connector on the back of the xbox. Sometimes the contacts are a little oxidated and that causes bad contacts. If you happen to have it on one of the audio output pin's, it could be the problem. It sure wouldn't hurt to try another AV cable, even a simple composite one just to see if that fixes the audio issue.
Another thing you can try is switching the left and right channel. See if the problem moves to the other channel as well. (Usually the red and white cinch plug's)
It's also possible that something is broken on the mobo. You should find 2 identical audio amplifier circuits for both left and right channels. If one of them isn't functioning properly, you will have your problem. The only way to find out for sure is feeding the circuits with a constant sinewave and measuring the signals with a scope to see if they are identical. As there are no detailed schematics of the xbox mobo, it's not an easy job to do.
regards.
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Topic: V1.0 Motherboard Audio Problem (Read 83 times)