My subwoofer and 2 rear speakers won't work anymore help!

I have realtek hd audio and a 5.1 dolby digital surround sound system (a subwoofer with a built in amp that powers 2 rear speakers two side speakers and a central speaker.) But only the side speakers and central speaker are working right now. I downloaded the latest driver from realtek but it didn'f fix the problem. When I go into control panel and then click realtek hd audio manager and I select dolby digital 5.1 and click test the sub and rears down work.

 

Test the speakers on another computer/device to verify the amp/speakers are actually still functional.

 

Thanks a lot, I had to find out through a tutorial in máy nén khí, then I fix it, one result is wonderful, thank you very much