Question about JVC HX-D7 Shelf System

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Possibly bad audio amp ic

Hi, i have the same problem wiht my jvc where protection shuts of the system off with the speakers disconnected, there seemes to be no damage to the resistors or any other component around the amp ic, is there any way i could test it to make shure that the amp ic is bad?

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You'll need a voltmeter. Check for the absence of DC voltage at the amp ic's outpit pins under no signal conditions. Note, you need to check the output pins of the ic, not at the speaker terminals, as a relay would lift the speakers off circuit in the event of a DC potential being present at outputs, to protect speakers.
Jango

Posted on Mar 26, 2008

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1 Answer

JVC TH-V70 Shuts Down


Hello
Even after disconnecting the speakers, the systems shut down, means that there is something short inside the set. Normally, the output amplifier section circuits will have the short. The set need service, and may have to replace the audio output IC of audio secion. Contact the nearest JVC authorised service center at your town. OK.

Jan 24, 2012 | JVC MX-GC5 CD Shelf System

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LMy JVC CD player reads PROTECT across the screen even after resetting the cd player it still reads PROTECT, I'm so lost now because I don't have amps or anything attached just regular car...


Try checking your speakers and speaker wires for shorts and/or grounds. Make sure none of your speaker wires have any bare spots. If your speakers and speaker wires are fine, you may have a bad internal output ic inside of the deck.

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Why does my jvc pc-xc60 shut off after 5-10 minutes?


Possibly heat.

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Feb 21, 2011 | JVC PC-XC60 Shelf System

1 Answer

Htr 5630 shut off in 2 sec.


Sounds like you have a bad amp IC or transistors.
When these go bad they almost always put roughly 40 volts dc from the amp power supply to the speaker terminals. The protection circuit senses this dangerous (to your speakers) dc voltage and disconnects the speaker terminals from the amp via internal relays (the ones you hear click) and puts it into protect mode. If it didn't the dc voltage would quickly toast the voice coils of the connected speaker.

Apr 18, 2010 | Yamaha HTR-6130 Receiver

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My JVC mx-gc5 stereo says protect and then shuts off


If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage.
Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage (like squashed or rodent damage).

Dec 12, 2009 | JVC MX-GC5 CD Shelf System

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Jvc th-m45 shut off


shut off audio system is performed to protect it from damage due to high current consumption or short circuit in speakers try to disconnect subwoofer first and check if it is ok. the problem in your subwoofer or its cord-change the cord and check if it is ok thats fine if not change subwoofer.do the previuos for all speaker one by one.
if all above failed you must contact service center for help.

Apr 06, 2008 | JVC TH-M45 System

4 Answers

How to turn protect off


You cannot . This a feature that detects a short and shuts the stereo off before it can do further damage. If you can disconnect your speakers try that then turn on your stereo. If it displays protect mode your problem is internal. If it stays on try hooking up one speaker at a time to see if one of your speaker is bad. Make sure you turn off your stereo before attempting to reconnect your speakers . Good luck

Mar 03, 2008 | JVC HX-D7 Shelf System

3 Answers

Protect mode


Hi ,
Does your unit go into protect mode without speakers connected?.
Jango

Jan 26, 2008 | JVC HX-D7 Shelf System

1 Answer

Unit turns on, then clicks off with a "protect" message


You have a bad speaker on this unit or the audio output circuit is in need of repair. Try to disconnect all of the speakers and then turn on the unit. If it still stays in protect, you will need to have this unit serviced, unless you understand how these solid state circuits work. If the unit does come on without the speakers, turn off the unit and add one speaker at a time until the unit will not turn on. Disconnect that speaker and have it checked out or have the wiring checked out. Good Luck

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