Question about JVC TH-M303 System

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Audio switches off after time.

My home theater system has begun to turn the audio off after awhile. Sometimes a few minutes and sometimes an hour. The video continues fine. Does this on every DVD. You can hear a click when the audio dies. I suspect a component temperature failure. Any help on which component is the culpret would be greatly appreciated.
Thank you
Russ Had the same problem and eventually the sub won't power up at all. 120VAC Input voltage to unit is present but when power transformer is connected it drags it down to about a volt or so. No opens or shorts on the primary of the tranformer but I suspect it's faulty. They run about $80-$90 new but I have more checking to confirm it's pooched.

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  • Mike Bissonnette Jan 25, 2009

    Transformer is Ok after lifting it from the board and testing (must have been stand-by relay holding it out). Put it all back together and now working fine?? Just a thought...check if cooling fan is working when powered up (mine isn't). Not sure if t-stat controlled or should be on all the time. If unit is shutting down after a period of time it may be heat related. Leaving mine on for while to see if it kicks out. If it does, will then check to see if fan ok or not....more to come.

  • Mike Bissonnette Feb 03, 2009

    Well, unit has been operational since Jan 25th. I ended up removing the transformer connector and hard wiring direct to the pins. Likely heated the pin and solved a bad solder joint problem from the get go. It sits on the floor and has good clearance for venting. Still wondering if cooling fan should be always on or just when called for.

  • john130 Mar 17, 2009

    I have the same problem ie audio cuts after an hour or so. But I also have no output to two speakers-LH Surround and RH Front. I have substituted speakers and they seem the problem seems to be with the subwoofer.Has anybody any ideas?
    John on the Wirral

  • beausswanner Mar 23, 2009

    I'm a Fireman who wants to hook up amy Fire DP radio to his home stereo system . I want to be able to listen to my tuner/T.V. but when I get a call over my radio I want everything to go silent and the Fire D.P. radio to take priority


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I was wondering where you keep the unit... Is it vented OK?
Is there dust about?
And , like the jan 25th comment, it could be just a bad solder joint or loose electrical connection.
It's not the transformer cause the video keeps working.
I would check all the speaker wires to make SURE theyre all connected solid at BOTH ends.
I have a Harman Kardon AVR in the shop and the customer said it shuts right down after you tunr it on,,,,,,well it'll do that if the speakers arent ALL connected.

Posted on Jan 27, 2009

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You can get a spray designed for electrical servicing that will freeze a hot running component from electrical service suppliers.

Posted on Jan 26, 2009

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