Question about JVC TH-M303 System

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JVC TH-M303 I have a problem with the sound shutting off with the TH-M303 from JVC. If there is a "bang" or "boom" on a DVD or on TV it trips the breaker in the sub-woofer. The speakers are routed through the sub-woofer so they all go out, and you must turn them off then back on to reset the unit. This happens with any input (TV, DVD, cable). This happens at medium volums and is very bothersome in action movies where there is an explosion or gun shot. Even in such movies as "Harry Potter" when there is a sudden "Grroowwll" from a monster. Any suggestions?

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  • rkean Dec 30, 2007

    While watching a DVD yesterday, the sound suddenly went out. It did not return after shutting down and restarting. I opened up both the DVD unit and the subwoofer unit and got as far as checking all the fuses. Is there a breaker reset somewhere or does it self-reset? Fuses were all OK - wondering if something got fried.

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1 Answer

Well this is and isn't a fix. I don't know what the underlaying problem is that causes the Amp to shut down but I have come up with a way to stop it from doing so. What ever the problem is it is triggering a circut on the board called "Protect" which can be circumvented. You need to start by pulling out the amplifier unit from the subwoofer assembly. You will see that there are two circut boards at 90 degrees to each other that are connected by 3 sets of connectors. You need to remove the screws and wire that hold in the board attached to the bottom of the assembly. You can then pull it out disconnecting the connectors. The connector closest to the power trasformer is the one that we are concerned with. On the vertically oriented circut board you will find a small map of the connector identifying pin #5 as "Protect". Inside the portion of the connector attached to the bottom board that you pulled out, use a small set of needle nose pliers to break off pin #5. Then reassemble the amp and put the subwoofer back together. I used this solution and it has been working since. If you have reservations about breaking the pin out then try just bending it out of the way and partially reassembling the unit and powering it up. Once you see that it does indeed solve the problem you can break it out. Like I said, I don't know why it started to turn off spontaniously in the first place but this does fix the problem.

Posted on Sep 25, 2007

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Posted on Jan 02, 2017

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