Only 1 channel and the sub working on a Logitech... (by 2 users)

I don't know the cause of it,but I'm left with only one channel-all satellites work in that channel- and the sub performing pretty good.I can hear only a little noise from the others and that's it.The control center looks ok-detects inputs,the screen can be easily read and you can change configurations.Any suggestions?
Oh,and I can't extract the sub from the front unfortunately...

Thank you in advance.