Purchased the TH-M505 almost a year ago. First time we used it the system worked fine. After a week the subwoofer stopped powering up. Sent it back to JVC twice, both times after we got it back it worked once and then stopped powering up again. When we reconnect the cable from the center unit to the subwoofer often times we hear a click and the green light will come on for a few seconds and the click itself off again. We get a picture just fine, just no sound. What could be the problem?
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Re: subwoofer not powering up
I could either be the sub or the main unit. The main unit actually sends a signal to the sub to turn it on so if that circuit is bad in the main unit the sub is never going to come on. I've also seen bad cables (You'd be amazed at how stubborn people can be when din connectors don't cooperate).
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Sounds like your original and this sub have bad amps. The amp for the sub is not the same as the amp for the other speakers. The old unit has a dead amp and this new one is on the way out. (Pulling too much current on high bass)