Question about 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?

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  • fraser143 Oct 21, 2009

    It turns out that the main DSP chip had become unsoldered, the guy who fixed it said that this is a fairly common problem, due to overheating - so I may fit a small heatsink to the DSP, or mount a fan that blows onto it.

  • fraser143 Oct 21, 2009

    Just to clarify - the initial problem was the chip desoldering itself, the cause of the problem after it had come back was that there was a microscopic solder line between earth and the 'surround is on' pin of the chip. The nice chap fixed it for free and was rather embarrased...

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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.

Posted on Sep 26, 2009

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I'm guessing these are separate issues.

Has either one ever worked and stopped suddenly?

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  • Try this on your rceiver to see if it corrects your problem .If not make sure rear speakers are activated and properly connected
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