Question about JVC TH-C30 System

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JVC THC30 no subwoofer power = no sound

I have had this system for some time now. The subwoofer just refused to power up at all one day! Everything else seems to be working correctly, including the dvd player! But all the speakers plug into the subwoofer. The subwoofer just doesnt power up! Yes i have power to the outlet! Does anyone know what the problem could be?

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  • adamsbri May 25, 2009

    Same problem bro. Have you been able to fix it since?

  • adamsbri May 25, 2009

    If you know how to fix it please email me at adamsbri@live.com. I would really appreciate it! thanks

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dunnbiker
  • 8546 Answers

SOURCE: My JVC THC30 subwoofer won't

If you're saying you have a defective subwoofer that keeps the system from coming up you might find one on eBay. many owners of HTIB's sell off the remaining bits as parts die off.

Or maybe your subwoofer comment is not related to your power problem.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Posted on Apr 18, 2011

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My JVC THC30 subwoofer won't power on therefore no sound since all the speakers run through it. How can I fix this or is there a way to replace just the subwoofer?


If you're saying you have a defective subwoofer that keeps the system from coming up you might find one on eBay. many owners of HTIB's sell off the remaining bits as parts die off.

Or maybe your subwoofer comment is not related to your power problem.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

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