headphone's right sound does not work on notebook's sound jack

okppko

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Nov 6, 2009
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Both left and right sound works on a headphone. Tested on another computer.
Headphone connected to a notebook's headphone jack, left sound works. Right sound does not. Right sound is very low. If you remove the headphone, there is sound on both speakers of the notebook.

Do you know what could be the error?
Can I do something without disassembling the notebook?
I tried needle poking the notebook's audio jack. No result.
Thanks.