I have doing that, but it still heared left speaker. When I set balance to right I can't hear everything from the speaker. I think it was the audio chip problem, how to fix that audio chip problem?
It can't be fixed if it's problem on the mobo. As dodger suggested, just buy a sound card. You don't need to get the most expensive ones. Check whatever slot is available in your motherboard. It could be PCI or PCIex1 kind of expansion cards.
Just make sure that drivers will be available for your OS.