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Stereo amplifier shutdown.

SONY STR-DB925 Receiver

The amplifier turns on OK. After a few seconds the speaker output relay activates, and the display flashes: ''PROTECTOR''. At that point the amp is completely non- functioning. It was a very hot day when this happened, so can any one tell me what component has failed? I have the service manual for this model.

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  • Sony Master
  • 17,129 Answers

  • The amplifier is showing the protect mainly due to a safety feature on the power circuit. The fault could be failure or short in the output stages, short in the speakers, fault in the power ciicuit or the error amplifier that triggers the relay.
  • To trace the fault it is impotant to make the test in the main board, disconnect the power to output to confirm if the output is faulty. similarily disconnect the powering circuit one by one to identify. replace or disconnect to confirm. Hope this helps. Good day

Posted on Jul 14, 2010

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1 Answer

The word protector starts flashing a few seconds after the receiver it powered on


It indicates you have an output short circuit.First check if all the speaker cables are all right with no shorting of the wires.Next disconnect all the speakers and try turning it on, if you still get the protect display you have to repair the output stage of the Amplifier.You will have to get professional help for that if you have no experience in electronics.

Aug 23, 2011 | Sony STR-D1015

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Hello my sony audio/video control center #STR DE335 is in PROTECT MODE.. and i cant listen to it..can u please tell me whats wrong?


PROTECT display indicates that receiver got serious problem in output amplifier section and protection mode is activated to avoid further damage.
Output amplifier section should be tested by qualified technician to find out and replace defective part(s) to solve this issue. Local repair shop will do this job as it is not user level repair.
Thanks.

Apr 29, 2011 | Sony STR-DE335 Receiver

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Str de 435 I was watching a movie nothing was being moved when suddenly I heard the relay click the protector mode came on thank you


Relay click and Protect display indicates that receiver got problem in output amplifier section and most probably output chips got defective. This kind of problem is not user level repair and local repair shop will help you to get it fixed.
Thanks.

Oct 15, 2010 | Sony STR-DE435 Receiver

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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

Sony STR-DA3000ES PROTECTOR - CHECK CODE 11


There is a defect in the final amplification stage of the receiver. This may have been caused by a short in the speaker wires. The typical defective parts are the output transistors. Expect a parts cost in the $40 range for this repair. Any audio service shop should be able to repair this.

Dan

Sep 21, 2009 | Sony Audio Players & Recorders

1 Answer

I have a sony str-de335 fm stereo receiver and


This can be shorted output transistors (common) or a defective voltage amplifier IC. WIthout taking measurements inside, there is no way for me to make that determination. In any case, this should be a relatively simple repair for a shop that repairs audio gear. Expect a parts cost in the $25-$40 range.

Dan

Aug 19, 2009 | Sony Audio Players & Recorders

1 Answer

Protect is on


Hi...
Is it LOUD when you first turn it on?
Are the speakers firmly connected at BOTH ends?
If that's all OK then one or both of the output modules in the power amp have failed.
Parts are available

Jan 22, 2009 | Sony STR-DE715 Receiver

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Output


When you change the selector switch, do you hear the relays inside the unit? Is your muting button activated (found to the lower left of your volume knob)? Do you have speakers connected to A or B or both?

Dec 23, 2008 | Sony STR-DE685 Receiver

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Sony STR-DE135: No audio output


first, at turn on you should hear a relay click then a few seconds later a second click. if you should hear the two relay clicks then check to see if you have both A and B speakers on, if you do shut B speaker off. next check the tape monitor switch make sure that it is off. if you should not hear the second relay click you have a problem with the unit and needs to be repaired.

Feb 17, 2008 | Sony STR-DE135 Receiver

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