Problem with left audio

[dougal]

Connecting small cables to my expansion port using this guide:

http://www.cgquarterly.com/articles/tg16_cable.htm

Left Audio is hardly working only a very faint tinny sound (the game music).   Right (top pin) is working fine and so is video.

Left was working till about 30 mins ago. Its not the cable because i switched the left and right wires from the exp port and the sound (of right) passed through perfectly.

Did i damage somehow my expansion connector or stereo/sound chip ?

Can i fix it ?

Its a japanese white console.