Question about JVC TH-M505 System

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Subwoofer not powering up

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).

Posted on Jun 15, 2007

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Related Questions:

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  • Here is a list of cables for your unit from Crutchfield's.

  • If your looking for the s pin DIN cable from the sub you can get that anywhere. The 8 pin DIN is a standard cord the same across the board. Here are a couple to choose from.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Oct 11, 2011 | JVC TH-M505 System

1 Answer

JVC Home Theater System M505 The subwoofer will not come on and it appears that the system (speakers) will not work at all until it runs thru the subwoofer system.

Wiggle on the long round cable connected to the Sub woofer. If the SW turns on, open it and solder the connector or change the connector

Jan 18, 2010 | JVC TH-M505 System

1 Answer

What are these parts and where can i get them, subwoofer turns of

your looking at a capacitor (big round thing) and transistor (little black thing)

the y-221 on the capacitor should be a voltage designation, how to identify the transistor, well, i cant see it good enuf to say.

Mar 07, 2009 | JVC TH-M505 System

1 Answer


There are very few uses for the subwoofer. Try it on FM if you get audio the woofer is working.

Apr 22, 2008 | JVC TH-M505 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

Subwoofer shuts down

Check the connection in the back of the sub,where your wire plugs in from the DVD unit, the connector is loose in the unit itself. Had mine replaced and is doing the same thing again

Nov 24, 2007 | JVC TH-M505 System

1 Answer

How do i unlock my jvc th-m505 dvd digital theater system?

Hold the STOP button and push the EJECT button.

May 15, 2007 | 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

1 Answer

SUBWOOFER WON'T POWER ON (Grounding out???)

Check your cable that runs between the main unit and sub for bent pins. If they look fine there may be a short in the sub itself that is causing it to go in to shutdown.

Oct 21, 2006 | JVC TH-M505 System

1 Answer

JVC TH-M505 powers off right away

The unit is going in to shutdown. My guess is a failed output. Service is going to be required.

Sep 20, 2006 | JVC TH-M505 System

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