Question about Sony STR-DB930 Receiver

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I have a Sony STR DB930. Something happend and it

I have a Sony STR DB930. Something happend and it smoked up so I unplugged it. I noticed a fuse that was blown. I replaced the fuse but it blows immediately after I turn power on.

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  • Ter Xiong Feb 09, 2010

    I changed out the transistor pair for one of the channels that was dead. This pair of transistor was on a board that I had taken out of the reciever. Not sure why I had the power on while this board was out but the reciever smoked. I looked at the reciever but don't see anything that is burnt or smell anything. I'll have to take all the boards out so I can see the bottom sides.

  • Anonymous Mar 21, 2014

    this machine does not power on. could a fuse be blown or something?

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  • Master
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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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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

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

Hi I purchased a sony av amplifier model STR-DB930 on e-bay a few months ago and I am using 3 ohm speakers from my old surround sound system. The output selector on the back of the unit is set to 4 ohms....


The lower number in Impedance specs is not a suggestion. It's a limit. 3 is not between 4 and 8.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Sony-STR-DB930-Receivers-manual/id/387bh934/t/2/

If you don't want to buy new speakers, settle for safer low volume levels.

You're going to kill that receiver driving a 3-ohm load. HTS-style speakers aren't reliably re-deployable to other electronics. Perhaps, if you have 4 speakers and they're similar you could wire them in SERIES and present a 6-ohm load to each channel.

Re-engineering the speakers themselves is, well, don't do it. It isn't rocket science but it also isn

Feb 28, 2011 | Sony STR-DB930 Receiver

2 Answers

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


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

Sep 01, 2010 | Sony STR-DB930 Receiver

1 Answer

STR-DB930 Receiver


Hi. I have a similar problem, where the rear and more recently, the centre speakers cut in and out. The relays that connect them click on and off rapidly, like morse code! Annoying, especially losing the centre, as in a 5.1 mix the centre carries most of the dialogue. The voices will be very hard to hear without the centre speaker. I tipped my STRDB930 over, and removed the slotted panel under neath. This gains access to the under side of the bottom circuit board. There, you will find the solder joints of the 3 bottom relays, the fourth being mounted on a narrow strip of board above this. Shine a torch through the top onto the blue relays, and you will see where the solder joints are. I noticed that 4 of these joints looked like they were broken, so I re-soldered them. The centre seems ok now, although it's too early to tell. My receiver still clicks, but if that is comming from the relay mounted higher up, I don't know how to gain access to this easily. Hope this helps.

May 01, 2008 | 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

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