Question about Sony DAV-S400 System

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Sound problems on Sony DVD amp

Hi there, I have a Sony Compact AV System DAV-S400. Recently, the sound to the left channel has started to become intermitent. When you play a DVD or listen to the radio, the front left channel seems to cut in and out. Sometimes you can be using the system for a while before it happens, other times the sound goes almost straight away. I have tried using one of the other speakers and the problem still occurs. There doesn't seem to be a problem with the connection into the rear of the system but I'm not really sure what I should be looking for. Everything else on the system works perfectly, including the other four speakers. Many thanks for any advice you may have, Matt

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Re: Sound problems on Sony DVD amp

The socket that goes to the headphone jack at the front, should be soldderd if u have the (HP THEATER) come up on the display without haveing headphones plugged in, other wise re-solder the speaker out sockets on PCB again or failing that re-solder the output chips that are in a row with a piece of pcb on top that should fix the problem. Rickardo1

Posted on Sep 08, 2008

Re: Sound problems on Sony DVD amp

It might have to do with dry joints as noted in other questions

i have once re-soldered all points of the amp PCB and the sound did get better for the right, but still cuts to the left... ima try again tonite

Posted on Jun 20, 2008

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Hi Joey - I had exactly the same problem.

In my case, I followed the advice of others and took the thing apart. On the main amp board there is a large brown capacitor. Mine had come completely loose, so I soldered it back in place with a good amount of solder to make sure the contacts were ok. I also dabbed some solder on the headphone connectors on the same board (just follow the wire from the headphone socket to the board). Well, when I put it back together and tried it again everything worked perfectly, and it has so far remained free from the error. Hope that helps !

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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.

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