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

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Re: Onkyo TX-SV434 "Protect" light

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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Onkyo switching on and off

Internal circuit fault. The set goes to protection mode. Contact the nearest authorised service center for Onkyo.

Apr 29, 2012 | Onkyo TX-SV434 Receiver

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Solve protect mode

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.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Sep 15, 2011 | Onkyo TX-SV434 Receiver

1 Answer

I have a problem with my amp everytime I switch it on, it goes to protect mode. Even without connecting the speakers. What could be the problem?

hello the output transistor could have blown. this can happen if you play your receiver with high volume all the time the transistor heats up causing it to blow there are other components you can check first like any glass type fuses see if any have blown if ok check the capacitor see if any have swelled up or poped hope it helps


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1 Answer

I have a new Onkyo TX-SR508 receiver. When listening to FM radio the audio cuts out repeatedly for anything from a few seconds to a minute. Power fluctuation is very unlikely to be the problem. Signal...

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Need picture off the back of it to see connections, thank you

You can get the whole user's guide at

Jun 22, 2010 | Onkyo TX-SV434 Receiver

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If I turn the volume yp over 60 on my Onkyo

disconnect speakers turn up to 60 and see if cuts out if it does not cut out check your speakers

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There is a problem with one or both of the audio amp circuits. The amp is going into a protect mode as to protect and save your speakers. Sorry but there is no simple fix. this will need to go to the shop to be diagnoised. Good Luck

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Vollume trouble

the system protect is usually displayed when a condition of short or shorting is occurring in the speaker wiring or the voice coil of any of your speakers.... thte circuit of you reciever is trying to protect itself and you from a very costly repair,,,so it you have another set of speakers try to use them and see if the condition still exists and if it does the problem is in the output section of the receiver,,,and if the protect no longer exists you have fixed your problem,,,good luck

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