Question about Sony STR-DB930 Receiver
Turn off for a period of 20 minutes then retry sound. not working.
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.
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
SOURCE: Sony amp str-db940 - protection
Somewhere in your speaker wiring, you have a shorted wire. This short can be as simple as a single strand of wire touching the other terminal on one of the speakers.
With a bright flashlight, look carefully at the back of the receiver and then the speakers for any loose strands.
Posted on May 27, 2008
This unit is having a problem with the preamplifier and power amplifier section. The reason to suspect this is that you can still hear sound, this is not likely if you ahd a failure in the power supply section. The unit may have had a failure in the amplifier areas of these sections, These are the signal amplifier sections that increase the power of the signal to drive the sound in the speakers .The Unit is probably in the protection mode reducing all power to prevent further damage to the rest of the receiver. You can go to the www.sony.com website support section and look in the frequently asked question and troubleshooting sections for problems like yours and see if they have any answers. On this website you can also find customer support. Ask them questions about the problem and see if they have any solutions.If all this fails to answer you problem, you can try opening the unit and looking for the problem yourself. Only work on the unit with it unpluged from the power source. Take off the top cover and look for any damaged areas, on the pc boards.They would be brown areas from excessive heat due to component overheating and possible failure.Look for capacitors that may have gone bad, they will be bulging from the top and bottom and may be leaking material from inside of them. Any component like this needs to be replaced. You may find burnt resistors and other failed components that will require a digital voltmeter to test.If you have expperience with this type of repair you might be able to isolate the problem and replace the parts. This may require the help of service information due to the complexity of the receiver's operations. Try to get a schematic or service manual from the web or a repair shop. This will have all the parts and a diagram of the all the different sections of the receiver. Usuall there is a power supply section, a tuner section, a preamplifier section, and a amplifier section. There also could be a equalizer section and other sections according the functions of the receiver. The failure most likely has occured in the preamplifier section or amplifier section. The problem in the preamplifier section could be a signal diode failure or a signal amplifier failure. in the amplifier section the problem could be in the output power devices which may be transistors or ic's depending on the type of output amplifier use in the unit. Usually not that hard to find with good service information and test eauipment.You may want to take this to a school that teaches electronic servicing and see if they will work on the unit for you for the cost of parts and a small labor fee. Call them first and see if they can help you out. I hope this helps you with your problem.
Posted on May 18, 2009
Sounds like you are pretty close with this one. If you select fm tuner do you get audio. If not you may have the speakers on the wrong a-b setting. Make sure the audio from your cable box is not muted or turned down.
Posted on Jul 15, 2009
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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Register and download the manual for free at retrevo.com
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
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