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Check its speaker. In subwoofers, the lead wire that goes to the voice coil; goes from the speaker solder terminal to the vocie coil will get internal break and this type of fault sill occur. Intermittent working of speaker will be the result. Lead wire can be replaced. It can be bought from the electronic spare part shops. It is a type of copper braid wire. If you have the skill, fid out which wire is faulty and replace the same. you have to take out the speaker out of the box for repair. Broken wire can be detected by measuring its resistance with a multimeter. OK.
If it is happening, Take a magnetic screw driver and move around inside the sub woofer any how , The magnetic screw driver will collect your spare screw .If it will be not done please remove the sub woofer remove all the screw and then you will do it.
you need the the satellite speakers hooked up in order for the sub to work. its not a standalone sub the volume control knob on the satellite speaker is what powers on the sub. i have extra speakers i wish i could give you cuz my sub just blew out.
Go to nearest computer store, ask them if they can give you the address of Logitech service center in your area.If one store does not help, go to 2 -3 more.
Another option , try searching in google maps for logitech service center in you area, this might sound stupid but works in some cases.
might be a loose connection in the jack terminal. Sometimes pulling it in and out several times might free dirt or oxidation in the metal contacts. A contact cleaner is handy with this. Check also the wires for continuity. hope this helps..