Question about JVC TH-M606 System

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WOOFER NOT WORKING JVC th-m606

MY SOUROUND SYSTEM IS WORKING AND AND THE SPEAKERS ARE WORKING FINE. THE SPEAKERS FEED OUT OF THE WOOFER BOX. THE LED ON THE WOOFER BOX IS LIT. THERE IS NO BASS REGARDLESS WHAT VOLUME ITS ON. ALL INTERNAL FUSES ARE GOOD AND NO SIGN OF DAMAGE TO TO ANY INTERNAL OR EXTERNAL PARTS, PLEASE ASVISE. THANK YOU MY SOUROUND SYSTEM IS WORKING AND AND THE SPEAKERS ARE WORKING FINE. THE SPEAKERS FEED OUT OF THE WOOFER BOX. THE LED ON THE WOOFER BOX IS LIT. THERE IS NO BASS REGARDLESS WHAT VOLUME ITS ON. ALL INTERNAL FUSES ARE GOOD AND NO SIGN OF DAMAGE TO TO ANY INTERNAL OR EXTERNAL PARTS, I CHECKED THE FUSES AND ALL 3 OF THEM ARE FINE, WHAT CAN BE DONE TO FIX THIS PRLOBLEM. MY BROTHER HAS THE SAME EXACT PROBLEM

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Loose or cold solder in the circuit board and cleaning problem this is the main caused of no Bass..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Regards,
VOTIT

Posted on Aug 12, 2008

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If the surround sound system your brother has is the same one you have, and your both having the same problem. then it would have to be a poor manufatured product. however. thier may be a onboard equilizer. you may check the user manual for information on settings. the speakers themself may not carry the bass as the woofer box probebly does.

Posted on Aug 12, 2008

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Mosfet's might have shorted and blew up a capacitor and might have took some surface mount parts with it.it will be in the middle board with the metal shroud (shield). try to replace it .

Posted on Aug 12, 2008

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TH-M606


Either the amp for the sub is bad, or the sub woofer speaker is bad. If you checked the fuses, you must know how to get the amp out of the sub woofer box (screws in the bottom of box and around the metal plate of the box). Take it out again and check the wires that go to the sub woofer. It is the red and white wires if I remember correctly. They come from the box and plug into the amp board with a white plastic connector. Or you can check the wires right at the speaker. The cover for the speaker comes off with about 4 phillips screws and then take the speaker out with the screw driver as well.Use an ohm meter and check the ohms on the speaker at those wires after you dis-connect them from the board. That woofer should measure between 3 and 6 ohms to still be good. If it measures less than 3 ohms or more than 6 ohms, it is probably bad and will need to be replaced.

Here is the JVC part number for that woofer.

CR250006-01

Be prepared, the cost is ridiculous. $110.16 at JVC's service site.

http://www.jvcservice.com/Service/JPartInq.asp?PgReq=DspDta&PrtNbr=CR250006-01

Or you could just find one that fits properly and use it instead. They are not the best woofer around and are very over-priced.

I hope this helps, if so a FixYa! rating would be very much appreciated. After all, it is the only reward we get for offering free help to people like yourself.

Dave


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You need to take apart tthe sub woofer and check the connection to bass speaker for continuity. It sounds like an internal broken connection to speaker on sub woofer unit.

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I'm having the same problem. It seems that the mosfet's shorted blew up a capacitor and took some surface mount parts with it. It will be the middle board with the metal shroud (shield). The mosfets are almost impossible to find, I have replaced them (as well as other parts) but still have yet to find the problem. I'm now trying to find the subwoofer amp board (part#LVA10505).

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What system are you using it with, how do you have it connected, when you say the system does not work as a result, does it mean that the system does not power up, or no sound?

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