Question about JVC TH-A85 System

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Bass speaker stops working every now and then

The bass speaker of my JVC TH-A85 system randomly stops functioning. It will shut off in the middle of a movie, or when im just watching tv or listening to radio. After a while it automatically comes back on. Does anyone have an idea what the problem is?

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Re: Bass speaker stops working every now and then

Hi, Ive finally found the problem with my system :o) Its not the subwoofer its the DVD unit!!! think outside the box. Mine was randomly switching into headphone mode, so i pluged some headphones in took them out and walla its working fine. Not sure why this happaned perhaps some dirt or something else got inside there???? Let me know if this helps

Posted on Apr 28, 2007

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I have a Th-C50 home theater and lost my subwoofer system cord, can I use a regular s-cord to make that connection? or is it useless with out the cord?? Please help!


Yes you can use any 2-core cable to carry the bass signal to the subwoofer. As the bass speaker cone is the largest cone in your speaker set I would recommend a good quality cable of decent gauge (thickness) to carry the bass signal.

You just need to make sure you have the right connectors for the amp and sub and make sure you connect positive to positive and negative to negative.

Hope this helps,


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

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I cannot get the functions on the remote to pbass dsp/eq etc?

The P.BASS function is only available with 2 channel LPCM sources such as mp3,Divx,cd
and wma. Press P.BASS button and "POWER BASS ON" will be displayed on the screen.
The P.bass does not work with DSP/EQ or DOLBY PRO LOGIC ll modes.
If you press P.BASS in the DSP/EQ mode, the DSP/EQ mode is automatically shut off and the P. BASS function comes on.
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Press the PL ii mode button to show STEREO on the display.
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Nov 04, 2008 | Samsung HT-Z310T Theater System

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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.

Aug 12, 2008 | JVC TH-M606 System

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Sub woofer shuts off

please check sub cable first with another good one and then change sub itself.because it draw too much power.

Jan 05, 2008 | JVC TH-C50 System

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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).

Dec 02, 2007 | JVC TH-M606 System

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Bass of woofer in my system is not working

take it to a tech for repairs.good luck

May 02, 2007 | JVC TH-C40 System

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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)

Mar 30, 2007 | JVC TH-M505 System

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Sounds but no bass

Check your setting for the sub first. If that doesn't pan out it is likely to be the amp.

Dec 28, 2006 | JVC TH-M505 System

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Systems shuts off if sound gets too loud.

Yes, i had this same problem. If it was too loud, at level 37+, any loud boom would shut down the subwoofer, subsequently shutting down the speakers. As such, I figured it might have been the 8 pin dim cable, but that wasn't it. What solved the problem was lowerin the BASS level. Not the level on the subwoofer, but the actual BASS level. I had it at +10 (the max) and it was too much for the system to handle. I don't think I ever had it like that so I'm assuming someone, maybe my daughters, moved the settings. But anyway, moving the bass level back down to either 0 or +3 at most maintains the "boom" effect of the subwoofer minus the shutting off of the system.

Oct 20, 2006 | JVC TH-C60 System

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