I have the JVC TH-C60. When I plug it in the lights flash and I hear the subwoofer click in sync with the flash of the lights on the main unit about every two or three seconds or so, but it won't fully power up. I checked the fuse and it has continuity, so that must not be the problem. Has anyone had a problem like this? And how do I avoid getting ripped if I DO have to take it in for repair?

HIya , sounds like the Sub is Ok if its making some form of sound so only the amp needs to go in and it unfortunately doesnt sound as simple as a wire etc but that something is faulty. I suggest request a written quote for the repair. You might struggle to get that, as guys dont like to quote (and they do have valid reason for being like that) but the right guys will give you a number! Best of luck

The subwoofer speaker itself may be bad or not receiving the signal. The trouble with all powered subwoofers is they will shake themsevles loose. Ive even had them shake the wires off the speaker terminals. It has to be troubleshot but check for open connections.