Question about Sony STR-DB930 Receiver

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I couldn't able to switch on my sony str db930 .when it was use it say me protecter.

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Check all of your speaker connections... usually the PROTECT cuts in when speaker wires get crossed or you have blown a speaker.

this PROTECT message also shows if the amp chip(s) have blown in the unit

Posted on Sep 01, 2010

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I have had this problem where the unit was going into PROTECT mode. This is typically caused by the relays and perhaps some other components developing dry joints over time. I had a professional refresh the solder joints and it works perfectly now

Posted on Jul 25, 2012

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SOURCE: I have a Sony STR DB930. Something happend and it

The fuse blowing is a symptom of something seriously shorted internally. What preceded the initial problem? Smoke is bad. Fire would be soon to follow without the fuse blowing. Take it to a tech.

Posted on Feb 09, 2010

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1 Answer

Sony receiver STR-DB930. child turned volume up all the way because of no volume then switched to correct input and speakers blasted. now they don't work at all. did the receiver get permanen


First things first: determine if the speakers have failed or the power amplifiers. Try listening with headphones: if this works then the speakers were damaged. Your speakers may have a circuit breaker or fuse on the back or inside, please check that first. I think it unlikely that anything was damaged in the receiver because of the action of your child. There is a lot of protective circuitry in these mid to higher end units. But given the age of the unit it is not out of the question, either. I have found circuit diagrams and repair manuals for two other older Sony units on the Internet. Now, you may not be an electronics guru and so you possibly cannot repair this yourself, but if you are planning to junk the unit first study the repair manual, open up the unit and look around the power amp section for damage. The power amplifiers are transistors in relatively large metal cases attached to heat exchangers. I'm afraid this doesn't answer your question directly but maybe it will help you "self serve" and at the very least feel a little less bad about throwing it away.

Nov 26, 2014 | Sony STR-DB930 Receiver

1 Answer

Sony DB930 Receiver goes into 'Protect Mode' when it is turned on


If the problem is going in and out, it sounds like it may be intermittent solder connections. This most often happens on the preamp IC's in Sony receivers.

Mar 25, 2013 | Sony STR-DB930 Receiver

1 Answer

Hi there, my mates sony db930 protector light keeps coming on when you switch the machine on, is there any way of resetting it


Perhaps resolve the reason it's protecting?

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 a root cause for intermittent shutdown.

May 14, 2011 | Sony STR-DB930 Receiver

2 Answers

Sony STR-DB 930. Intermitent sound quality from front speakers ( low then loud ) with sharp clicking noises like relay switches clicking on and off. Thanks Dave.


I have had this problem which then developed into the unit going into PROTECT mode. This is typically caused by the relays and perhaps some other components developing dry joints over time. I had a professional refresh the solder joints and it works perfectly now

Mar 25, 2011 | Sony STR-DB930 Receiver

1 Answer

I have a Sony STR DB930. Something happend and it


The fuse blowing is a symptom of something seriously shorted internally. What preceded the initial problem? Smoke is bad. Fire would be soon to follow without the fuse blowing. Take it to a tech.

Feb 08, 2010 | Sony STR-DB930 Receiver

1 Answer

The idicator on my sony srt db930 reciever protector turn on.


There are a number of problem detection circuits inside the unit that will shut it down to prevent further damage. The most common cause of this is either crossed speaker wires or internally shorted output transistors. Try removing the speaker wires completely. If the unit still starts with the protect message, then the problem is internal to the unit. For these models, the output transistors usually cost in the $8-$15 range each and are replaced in complimentary pairs. Without taking internal measurements, I can not state that this is your exact problem, but it is the most common. Add in your local labor rate to get your approximate repair cost. Dan

Jun 09, 2009 | Sony STR-DB930 Receiver

1 Answer

Sony STR DB-930 Receiver jumping into protector mode


I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.

Re Assembled unit and it worked OK.

I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.

Thanks for the technical help, sure solved my problem.

Regards

Darryl.

Mar 07, 2008 | Sony STR-DB930 Receiver

1 Answer

Sound problem


it's most definately dry solder joints on the main PCB.
this is very common on this model and the DB-940.
these generate alot of heat when in use and is also the cause of the problem.
you may also hear the relays clicking from time to time and this means they'll need resoldering too.

hope this helps.

Jan 21, 2008 | Sony STR-DB930 Receiver

2 Answers

Protection mode keeps kicking in


This happens less often in "normal surround" mode

Apr 01, 2007 | Sony STR-DE485 Receiver

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