Question about Sony DAV-S400 System

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Problem With Sound

Hey there, hope someone can help. Had my Home Cinema for bout 2 years now and has always been fine. Recently though, when I insert a DVD or run the sound from my Xbox through it, it intermitantly cuts to 'Headphone Theatre' mode and randomly switches back to normal sound fields and then back again. I don't even have a pair of headphones so the jack socket is always empty. I don't really want to pay £60 to Sony for the privlige of being told it was dust inside the box, or something similar. Any help will be gratefully appreciated.

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  • Anonymous Jan 08, 2008

    Thanks to Mark140872 Iv'e just fixed my DAV-S400. It started to run through Headphones only after I moved it to another room. And thanks to Marks clear instructions on how to fix it. Its now back working again. Jan 08

  • matty d Apr 08, 2008

    automatically turns to headphone function with no jack in the socket

  • Anonymous Jun 14, 2008

    hi there! my friend has just given me his old dav -s400 and it all works just fine but, it seems to be stuck on ''headphone theatre mode'' now, i've tried everything on the remote, but i cant seem to clear it, so now it's only comming throgh the tv sound please can you help?

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THE SOLUTION KINDLY POSTED BY MARK TO A PREVIOUS PROBLEM SHOULD FIX THE SOUND ON THIS ONE AS IT WOULD APPEAR THAT THERE ARE INHERENT PROBLEMS WITH THIS MODEL AND THE SOUND OUTPUT Problem:posted by johnny 5 on Sep 02, 2006Report abuse Have had this sys for about 2 years and recently moved it to another room but when re-installed it would only play through the headphones. Moved it back to its original position but it hasn't corrected the problem. Best Solutionposted on Nov 19, 2006 By Mark140872 Rank: Not rated Rating: 0%, 0 votes Hi I've just fixed this problem on my DAV S400. It's down to dry joints on the Amp PCB. Very simple to fix if you know how to works a screwdriver and soldering iron! Take the cover off and with the back of the unit facing you, you'll see teh amp PCB in the left hand corner to the back. At this time its the wrong way up to fix it so you'll have to remove the Ariel connection box and the speaker connection PCB both are very easy to do. Lay these out of harms way but do not disconnect any of their ribbon cables as its not needed. Now you can unscrew the amp PCB which is bellow both boards you have just removed. Disconnect the phono wire from the PCB (keep a note of that) and disconnect the power lead to the PCB on the right. Up turn the PCB and remove the copper heat sheild. You should now find the dry joints. The phono plug you just disconnected fits into a multi socket on the PCB. This will probably be loose or have more than one dry joint. Re-solder all these making sure not to link any together. Now find the large brown capacitor and check these joints and if needed re-solder. Check for any other dry joints while at this stage if any look slightly poor give them a quick dab with the soldering iron but make sure you don't fry a chip!!. Re-assembele remebering to reconnect the phono wire. I allways check before putting the case back on. This worked for my S400 after my 18 month old got hold of it. Good luck! Thank you for rating this solution.

Posted on Jan 25, 2007

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