Question about Onkyo TX-SV434 Receiver

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Onkyo TX-SV434 "Protect" light

This week when we turn on the receiver, the term "Protect" replaces the FM frequency after a few seconds. We cycled the power We disconnected all patch cords/speakers We cycled power again, Still happens with nothing plugged in

Posted by park griswald on

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The protect mode is a built in safety message, indicating that theres a fault somewhere with-in the unit, and it wont let the unit come on fully or more damage will occour. This unit is a solid state device, and you should not attempt to use it or open it or try any self repair as it will cause more damage. If this unit is more then a few years old , it might just be the time to start looking around at all the back to school sales on electronics, as to have this unit serviced will cost an estimate fee as well as parts and labor. If you want to invest a few bucks into this machince , then go for it, but its most likly will cost 1/2 or more then the cost of the entire unit did when it was new to have it repaired. It is up to you. Good Luck

Posted on Aug 09, 2006

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When I turn my system on, it waits 5 seconds, says "PROT" then shuts itself off.


There could be a short circuit in one of the speakers. This would cause high current flow thru the amplifier and result in self-protect. Disconnect all speakers from the unit and try powering up again. If there is no PROT, then reconnect speakers one by one until fault found or all speakers are reconnected.

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The highest vcore voltage on my intel 2500k


Suggest you try an overclocking forum

All I know, is you bump the Voltage up in SMALL increments.
Bump up a small increment, then do a 24 hour burn in.
(Yes. Means computer runs 24 hours straight for the test)

Everything's cool? Then bump the Voltage up another small increment.
Do another 24 hour burn in test.

GO TOO FAR, and things start getting 'bumpy', and eventually system turns off.
GO TOO MUCH at first, and you stand the chance of frying stuff.

Also; the Ram Memory, and expansion slot frequency rate, support changes, when you change the Voltage for the CPU.

You are changing the CPU's front side bus, also. (FSB)

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People understand the term Speed, so they can relate to what is going on.
It is actually a rudimentary term.
Leaves you not exactly knowing what is going on.

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The Front Side Bus (FSB) is measured in a Frequency Rate.
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1 Answer

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This is probably a 60 cycle hum and the problem is more likely confined to the am/fm board, there is a bad ground due to poor solder joints, broken ground wire, an open capacitor, this may not be easy to find, but it is a start.

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1 Answer

My sony fm stereo/fm-am receiver str-de505 reading " protect " but it only activates the auto protect function when i raise the volume.....What do u think?


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

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.

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Sir, i am a technician i have a jvc car mp3 model no.415 my cd player is now in protected how to remove this problem which part diffective please give me solution


First, check all speakers and speaker wires for shorts and/or grounds. If they all check out fine, try pressing the reset switch if there is one. If there is no reset switch, try disconnecting power to the radio for a few seconds. If the radio still remains in protect mode, chances are you probably have a blown output ic or voltage regulator ic.

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1 Answer

My Harmon Kardon 3490 goes into Amp Protect mode a few seconds after power is turned on. What is the problem?


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.

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Hi, after i turn the power on and then press the stand-by button, it clicks off to stand-by mode instantly. This is an Onkyo TX-SR500


This indicates that the system is going into protect mode. First disconnect all speaker wires (with the power cable disconnected). Then turn the unit on and see if it sill shuts aff ofter a few seconds. If it does not, then you have a problem with the speakers or speaker wires. inspect the wires at both ends for frayed strands that may touch. If that all lookd good, plu the speakers in, one at a time, until the problem reappears. Be sure to turn the sytem off before plugging in any speaker just to prevent any accidental short which could be catastrophic. If the system goes into protect mode with all speakers disconnected, you probably have a shorted output transistor.

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I had the same problem. Only thing that I came up with that was consistant is plugging it into the aux jack on my radio so you don't have to depend on FM frequency. But, my unit crapped out this week and I hope it is under warranty.

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1 Answer

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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