Question about Sony STR-DE725

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Sony "Protection" mode - STR-DE725

I have a Sony STR-DE725, which will click into "Protection" mode after 1 second to 5 minutes of use. I've tried cleaning it out, looking for any loose wires, etc. Nothing. Now even when I just plug it in with no connections, the problem still happens. Any ideas?

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Re: Sony "Protection" mode - STR-DE725

My sony used to do that to umm cant remember the model but yeh i could play it at low volume but as soon as i turned it up it would start clicking and telling me to turn of the power...

I resolved it by checking every cord connected to it, it turned out that because I connected two speaker cables together i didnt seal it properly and they were touching this was making it go into protetion mode.

Posted on Jun 10, 2008

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My Sony str de335 is in protection mode speakers are unhooked how do I get it out of protection mode?

if you disconnected everything and it still goes into protect, the most likely there is a damaged amp channel that will need to be repaired.

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The digital sound is off after 1 houre str de sony str de 485

It sounds like the receiver is either failing or going into a thermal protection mode.

There should be NO reason why the input source (digital versus analog) should make a difference unless you play the digital sources obscenely louder than the analog ones.

If you suspect heat, you should be able to feel it.

Can you verify that the digital sources ONLY do this?

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I am thinking of buying a SONY STR DE725 (QS Series) AV receiver. I alreay have a set of home theater speakers with 5 x 80W 4 ohm and and active Sub-woofer (200W). I am wandering whether the receiver...

Yes, it will support a powered subwoofer.

If your existing speakers are from an all-in-one Home Theater in a Box and they have molded connectors you'll have to chop them off to make the ends bare wire and determine which is plus and which is minus on each. Loads of 4 ohms may present a problem at high volume levels.

Take the rated wattage of the sub and other speakers in an HTIB with a HUGE grain of salt. They plays numbers games with th low impedance and the allowable distortion levels to get the results they publish.

For all anyone knows, the speakers and their original electronics may have been designed to operate together to yield adequate performance (like Bose does). Breaking that pairing may give unpredictable results and risk of damage to the speakers or the new receiver.

Feb 18, 2010 | Sony STR-DE725

1 Answer

This amp wwhen turned on, dosplays 'PROTECTOR' on teh display, what is this telling me?

Disconnect all the speakers and unplug it for 5 minutes. Then turn it back on without any speakers plugged in. If it doesn't say protector, then you either have a shorted out speaker or wire. The amp is in protection mode which is designed to keep it from burning up. If it still says protection, then it will need to be repaired as it is too late.

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I don't get any front display or any sound when turned on.

Do you hear any clicks? If not, the standby transformer or related circuitry is bad. If you hear 1 relay click...the audio output section is most likely the problem. The first click you hear is the main power relay...and should see display.. the second relay click is the protection circuit relay engaging to let audio to your speakers...if the second click is not heard (it should occur in 3 to 5 seconds) there are shorted output transistors or a shorted output IC trying to blow your speakers with 50 to 75 volts dc. The protection circuit monitors the speaker lines for voltage. They should always read milli-volts only...not even 1 volt.Anyway, good luck

Sep 24, 2009 | Sony STR-DE525

1 Answer

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I Have a son STR DE 845 and the speakers make a popping sound when it is in DTS mode what is the problem.


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