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Radio switched on then shows PROTECT then switches its self off

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  • Anonymous May 07, 2009

    when we turn the receiver on it works for a few minutes and then switches off and shows "protect" on the screen. is this a blown fuse? or did we blow something else? please help! and please no hard to understand jargon!

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  • Master
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The audio amplifiers ICs of your device are damaged you gotta change it.

Posted on Apr 18, 2008

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A short has transpired before the fuse. Now in protect mode. See a tech.

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Protect mode


thank you for the advise. i have the harmon kardon avr 3600 and was worried that i destroyed it. i will take it to a shop and get it fixed since it is a great receiver.

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My nad t753 reciever went into protect mode. i switched it off and was able to get it back into standby mode. The receiver switches back on but no sound comes out of the monitors. I can even switch between...


Generally speaking, an amp attempts to protect 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 'nekkid'. 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.

Aug 31, 2011 | NAD T753 Receiver

1 Answer

When i switch on protect is displayed and the unit switches off


The product you're inquiring about is not showing in your post.

Generally speaking, an amp attempts to protect 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.

Apr 29, 2011 | Audio Players & Recorders

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I have a Tevion 7.1 amplifier (AVR 2006). Protect overload flashes up and then shuts down. I have only had limited use since I had the unit from new (a few days). Last time using it someone pluged an...


The protect indication is due to a overload on the power amplifier unit. So you need to check the speakers to see that they are not shorted. remove all the speaker lines and switch on.
if there is a processor reset, power off the set and switch on while holding the selector/standy by switch. if not there is damage in the output within the amplifier.

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I couldn't able to switch on my sony str db930 .when it was use it say me protecter.


Check all of your speaker connections... usually the PROTECT cuts in when speaker wires get crossed or you have blown a speaker.

this PROTECT message also shows if the amp chip(s) have blown in the unit

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"PROTECT" displays after I switch ON the power.


there is short inside, usaull with copacitors u might want to have it looked at

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My kenwood krf-v4060d reciever on/off switch is faulty, it stays switched on for a few seconds and then switchs its self off.can i get a replacement ? i have had not much luck here,any suggestions !


The problem is not likely to be the switch itself. The unit is rpobably going into "protect" mode because of a problem internally. Try removing all the cables and try to turn on the unit. If the behavior remains the same, the output section requires repair. The most common failure is the output transistors. Expect a parts cost in the $40-$60 range.

Dan

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Amplifier/receiver switches off systematically after a few second of use


Sounds like a bad output channel is causing it to go into protect mode. Time to see a repair tech.

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