Question about JVC THC3 Home Theater System System

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JVC XV THC3 Subwoofer fan not working

Can you tell me what to do. My surround sound, sounds great but the cooling fan on the subwoofer does not work. What should I do?

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Re: JVC XV THC3 Subwoofer fan not working - JVC THC3 Home Theater System System Home Theater Systems

Maybe its not pluged in

Posted on Jul 10, 2009

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I have a JVC surround system, I have power to both the DVD player and the Subwoofer but no sound. Wheni plug in earphones to the dvd player there is sound but nothing when unplugged. Could it be the S

You must have an external cable connection from the DVD audio output to the surround DVD input. As well there should be an output from the surround marked subwoofer. Connect them with the proper cable

Apr 04, 2012 | JVC TH-S8 System

1 Answer

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.

Apr 18, 2011 | JVC THC3 Home Theater System System

1 Answer

My bass powered subwoofer on JVC system doesn't turn on

You need to check the signal. If there is not signal present or the volume is low the sub will not turn on and goes in to sleep mode.


Nov 09, 2010 | JVC THC3 800 Watt 5-Disc DVD Home Theatre...

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What is wrong with my theatre system?

have you tried all the sound settings from your dvd player? i have a 'sound' button to change from raw to surround etc. Press buttons and try it.

Some dvd's dont have the channel outputs, so try it listening to classic fm or radio 1.


Aug 30, 2009 | JVC THS55 System

1 Answer

Subwoofer powers on for about 4 seconds and then shutsdown

I don't know if you were able to get the problem fixed, but I had the same sort of problem where it worked and then all of a sudden it stopped working right in the middle of a movie.
I took it to a repair shop and he found that it was the power supply... a $4.00 part.

Jun 14, 2009 | JVC TH-C30 System

1 Answer

The subwoofer lites but no sound

Have you gone into the menu settings and adjusted the sub woofer volume, some factory settings are set @ zero.

Sep 09, 2008 | JVC TH-M55 System

2 Answers

Sub woofer its on for 3 sec..

your cooling fan is not engaging and coming on like its suppose to. One, the fan is probably burned out, which sucks because its low voltage and the only thing on the board that is low voltage. Two, there is a thermostat type component that tells the fan to start which HAS burned out and doesnt start the fan accordingly. If you look at the back fan and turn everything on you will see the fan either doesnt start or starts right as the relay trips turning the sound components off. If it starts at all your fans good.The thermostat component will need to be replace and I cant recommend a source. Just trying to explain the problem so you can look for the right repair. Hope it helps. I have one of these and have found this is the problem, but cant find the solution.

Apr 28, 2008 | JVC TH-M505 System

1 Answer

No Sound even through SCART

the subwoofer is your amp so it won,t give sound till you get the part any electrical shop should help you if you exsplain what you need ?

Jan 28, 2008 | JVC TH-M303 System

1 Answer

JVC TH M505 Subwoofer not working

i need to find the wire that connects from the subwoofer it has like little spikes inside the medal part and the spikes broke off

Jan 12, 2008 | JVC TH-M505 System

1 Answer


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)

Mar 30, 2007 | JVC TH-M505 System

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