Question about Sony STR-DE935

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Protector comes on and even when all speakers wires are disconnected

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Power transistors probably degreased or the greas had hardened and doesnt conduct the heat anymore. Quite touchie work, would suggest it only if u have some knowledge about soldering electronics.

Posted on Feb 26, 2010

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Disconnect amp power harness. fault will go away. time to troubleshoot a little. most likely a transistor. all that heat and no proper vent add a little dust. if trans. are good. dust removal and a fan did it for me

Posted on Jun 17, 2011

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Posted on Jan 02, 2017

techman
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SOURCE: Protector

If you took all the speakers off the reciver then it still goes into protect, the reciver detects DC on the output lines. That means there is a short in the output stage of the amp. It could be an output device, or a diffencal Transistor. If you can trouble shoot solid state electronics then you should be able to find the faulty, but if not your experienced at electronic repair, am afraid it may cost more then the reciveris worth. Good Luck PS please dont forget to rate this thread

Posted on Oct 23, 2006

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SOURCE: Protector flashing on Sony AV receiver--Model STR-DG600

Me reicever rite protect some time ,i put the sytem off and a start again

Posted on Jan 25, 2009

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SOURCE: the protector light comes on

The receiver has a short in the audio output stage in at least one channel, the parts must be replaced to bring it back up to normal operation.

Posted on Mar 10, 2011

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2 Answers

I have a Sony receiver model Str - de 435 it constantly flash Protector and I tried everything to fix this any ideas


The protector indicator usually indicates that one of your amplifiers has shorted output transistors. This is not a user repairable problem and the amp will have to be taken into the shop for service.

Mar 21, 2015 | Sony Audio Players & Recorders

1 Answer

The protector light comes on and shuts off audio, even at low volumes. I am wondering what causes the protector light to come on.


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.

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

Jul 31, 2011 | Audio Players & Recorders

1 Answer

My sony receiver STR-DE135 is showing a protector message


Check for shorted speaker cables, or even a bad speaker. I'd start by disconnecting all speakers, see if the indicator goes out. If so, try one speaker at a time until you find which channel is bad, and then examine the cables carefully for things like a stray wire strand. Less likely, but possible is a shorted speaker. If you disconnect them all, and still have the protector circuit on, it's an internal issue, and you're going to need a technician.

May 30, 2011 | Sony STR-DE135 Receiver

1 Answer

When home theater is turn on, protector push power is flashed on thee screen. player will not function further. volume level is 9. currently can't be turn down.


Protector means there is a short circuit somewhere in either the speakers, the wiring or inside the unit itself....you can try disconnecting all the speakers and then turning on the unit...if the protector goes away, then you have a bad speaker or bad wiring to the speakers....if the problem stays, then there is a faulty circuit in the receiver itself and will need to be serviced

Feb 05, 2011 | Audio Players & Recorders

1 Answer

It flashes the word - protector


Hiya,
Disconnect all speakers at the receiver and power it back on. If it stays on, check all speaker wires and speakers for shorts (touching wires). If it cuts out, it needs to be serviced.
Regards
Mike

Mar 24, 2010 | Sony STR-DE625

1 Answer

My SONY HT-CT 100 Keeps going into "Protector" mode - even though there's plenty of airspace and the room that it's in is at 65 degrees farenheit


Protector mode does not just react to ambient temp. Try unplugging all the speakers from the back of the unit and turning it on. If it continues to go into protect mode, it is most likely a bad power supply or possibly a bad D/A circuit. If it does not go into protection mode when the speakers are disconnected, try hooking up one speaker at a time (while the unit is off) If the unit faults again when you turn it back on, it should point toward a bad speaker or crossed wires.

Dec 28, 2009 | Sony HT-CT100 Theater System

2 Answers

Message "PROTECTOR"


Disconnect all speakers at the receiver and power it back on. If it stays on, check all speaker wires and speakers for shorts. If it cuts out, it needs service. If you need detailed troubleshooting help on this after testing receiver without speakers connected and it passes, post a comment and I can walk you thru it. Hope this helps.

Oct 24, 2009 | Sony STR-DE625

2 Answers

My screen flashes protector and nothing will turn on


Have you tried to unplug and reset the reciever? Usually protector is on because of an overload.

Oct 14, 2009 | Sony STR-GA7ES

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

Whenever a little bass sound - explosions, gunfire, helicopter blades, etc., ''PROTECTOR'' flashes on LED and shuts down receiver. Seems to happen more frequently lately. Subwoofer cable sturdy, no...


The protection feature on these units will shut off the receiver when there is too much power draw or when a speaker wire is touching another wire. First, check all of your speaker connections and make sure the wires are nicely twisted and inserted into the speaker and receiver with no stray wires touching. Secondly, if this doesn't correct the problem, try going into your speaker settings menu on your receiver and select "small" for each speaker. Let your sub handle the bass. The sub cable should have no effect on the protection feature of the receiver. The speaker wires, however, are the most common culprit of a receiver turning off (protector). Hope this helps.

May 03, 2009 | Sony Televison & Video

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