Question about Sony STR-DB940 Receiver

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Sony str-db940 Hi, My Sony STR-DB940 surround sound receiver is loosing the sound. About a month ago, it was loosing sound and by tapping the unit the sound would come back. I got progressively worst. Now no amount of tapping will bring the sound back, it just comes on and goes off as it pleases, regardless of the input chosen. I check all cables and they are all tight. There is a clicking sound, comes and goes. DC

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  • eclipse25 Oct 19, 2008

    Hi I have a similar sort of problem I have little sound coming out of the left front speaker I have changed the fronts over but it is the same the only time the system works is if I use optical or coaxial inputs it seems as if the left side of all the phono input sockets don’t work.

  • balloony Jan 19, 2009

    In my case the rear speakers go in and out. There is the same clicking noise like a circuit breaker is clicking on and off. Wire connections are good. When the rear speakers go out, even the speaker test won't activate them.

  • prosegger Apr 13, 2009


    just got the same problem (after some weeks of clicks now no more sound whatsoever). I've got the device open and in front of me, multimeter in hand. Can anybody help me and tell me where/what exactly to measure to find the problem and fix it?

    Thanks in advance,



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Most likely a cold solder joint somewhere in the audio circuit. Most likely on the legs of the relay that turns the speakers on or off. Also check the connections at the audio outputs. Give it a good look over for bad solder connections, given the symptoms that's 98% likely to be the problem.

Posted on Oct 06, 2008


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Rear speakers L and R not working and MD in and out not working on my Sony STR-DB940

I'm guessing these are separate issues.

Has either one ever worked and stopped suddenly?

From the manual:
"No sound or only a very low level sound is heard from the rear speakers.
>>> Make sure the sound field function is on (press SOUND FIELD - MODE).
>>> Select a sound field containing the word "cinema" or "virtual" (see page 33-35).
>>> Adjust the speaker volume (see page 72).
>>> Make sure the rear speaker size parameter is set to either SMALL or LARGE (see page 20)."

Be advised that using any Tape Monitor loop (that's what the MD/DAT is) disables any digital sources. Not that that would explain the rear speaker failure. Analog sources can still be processed into various surround modes.

Any Tape Monitor use requires at least a live INPUT to hear anything.

May 29, 2010 | Sony STR-DB940 Receiver

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Hello,When the amp is turned on there is no sound the amp has been fine up until now what should i check?

I have the same problem. Over the night the sound disappeared. It happens on all the inputs(analog/digital) and with speakers/headphones. The digital signal is correctly detected and all the 'clicks' are like before when turning the amp on. Switching to direct mode does not help. Is there schematics available somewhere? I suppose it's some output related soldering which has come loose. If only I knew where to look, or point a local service guy to right direction...

Dec 15, 2009 | Sony STR-DB940 Receiver

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Is it possible to setup lip-sync on the DB940?

no adjustments in that unit for timing

Nov 02, 2009 | Sony STR-DB940 Receiver

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I have a sony str-db940, since it came back from being repaired, it reports 'not in use' when the 'sur' button is pressed and won't decode surround sound. Any ideas?

Check if you're using the digital cables like optical cable to get the audio from the receiver. If yes, please select the Input mode to AUTO by pressing the mode button repeatedly. If you're using a analog cables, please try to change the sound field and check. Press the A.F.D button repeatedly to change the sound field and try. You can also try connecting a different audio source like Cable box, dvd player and check the issue.
If the issue persists, please reset the receiver. To reset the Receiver, turn OFF the unit and press n hold the MODE + button and Power button till S.F Initialize appears. If the issue still persists, you may be having 90 days warranty after the date of repair or original warranty which ever is longer. Contact sony to resolve the issue.

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The amp is turnd on but no sound on any channel

i need a little more detail to help you out, one issue it could be is that you have your reciever set to optical audio when you dont have an optical cable for it, if thats not it, re check your connections

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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.

May 27, 2008 | Sony STR-DB940 Receiver

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