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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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

1 Answer

I just got a jvc compact component system hx-d7 i go to turn it on and it turns on but thats about it i get a red light at the on button and it beeps could it be a fuse on something


This seems that the unit switches off due to a protect cut off. It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 01, 2011 | Audio Shelf Systems

1 Answer

My jvc compact component system keeps flashing PROTECT and then it shuts off


Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance 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.

Mar 21, 2011 | JVC HX-D7 DVD Compact Stereo Audio / Video...

1 Answer

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

My stereo won't work. Whenever I try to turn it on, it always turns off saying "protect." How can I fix this?


The protect has come on because it senses an output load problem, Turn the unit off, unhook the speakers and wires from the stereo, now turn the unit on and turn the volume down as far as it will go, this should reset the processor ic, if the word protect stays off you have a short in the wiring or bad speaker. If the protect comes back on with everything unhooked the problem is in the audio output ic pack in the stereo and will require a technician to remedy.

Jan 17, 2011 | JVC MX-KC58 Shelf System

2 Answers

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

1 Answer

My system is protect status


Check the connections of the speaker wires. You may have a short between one of the pairs. Try disconnecting the extra speakers if nothing is obvious. It could be a damaged cord also.

Ted

Nov 06, 2008 | JVC HX-C6 Shelf 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

Jul 14, 2007 | JVC FS-G5 CD Shelf System

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