Question about Sony STR-DE935

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Sony STR-DE935 5.1 Surround Sound Receiver. The unit will not power on. When I unplug it from the wall and plug it back in I clearly hear 1 "click" and then when I push the Power button nothing happens. I know nothing about the electrical schematics of this unit and when I opened up the case I couldn't tell anything was wrong by just looking inside. This unit was used heavily for 6 hours a day for approximately 6 months before this happened. The only thing I can think of is maybe it overheated. Can anyone give me some tips on what to check for to get this thing working again, or do I just throw it in the trash and go without sound? (I can't afford another surround sound unit right now)

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  • Sony Master
  • 20,136 Answers

One of the power amplifiers usually fail. If you are not an electronics engineer, get someone else who is competent to repair it.

Posted on Mar 30, 2017

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Posted on Jan 02, 2017

  • 92 Answers

SOURCE: sony str-db940

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

  • 1 Answer

SOURCE: Protected

Oct 23, 2008 I have the same "Protector" problem. There is mention of this on Sony's website:

Follow the steps below to troubleshoot if the word PROTECT or PROTECTOR is flashing on the A/V receivers display.

  1. Check the speaker wires and speakers for proper connections.
  2. Reduce the volume level. IMPORTANT: If the receiver is played back at maximum volume level it may enter the protect mode. Maximum volume listening will cause the receiver to run very hot and may drain the output capacitors.
  3. Disable the surround sound option if both the A and B speakers are being used simultaneously.
  4. Ensure the top of the receiver has proper ventilation to keep it from overheating.
  5. If the message only occurs when using a DVD player, the sampling frequency may be set too high. IMPORTANT: Some receivers provide compatibility with the higher sampling frequencies through alternate connections. Consult the owners manual for specific information.
  6. Unplug the AC power cord for about 1 to 2 hours to reset the output transformers.
If the issue is still unresolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.
**********************************************
I followed their "advice" to troubleshoot...now my unit's been in the shop for a couple weeks.
I called for status today 10/24/08 and was told that there is a "backorder on a part". My repair
shop cannot estimate when the "part" will be available.

SO...I suspect a component failure and since Sony does not have the part, the questions are:
1. Is there a delay in Sony getting the needed part from the manufacturer (if it's not Sony)
2. Are there so many occurrences of this problem that Sony can't keep the the "fix part" in stock!!

Time will tell!

Posted on Oct 24, 2008

  • 1 Answer

SOURCE: Protector flashing on Sony AV receiver--Model STR-DG600

Me reicever rite protect some time ,i put the sytem off and a start again

Posted on Jan 25, 2009

  • 2 Answers

SOURCE: No sound from rear speakers during test tone usng Sony STR-DE475

I had this problem last night.

To solve it, you can reset the amp by:

1) Put the receiver on stand-by
2) Hold down "MODE" button and press on button
3) "S.F. CLR" appears in the display and surround is back on.


Good luck

Dr Gardner

Posted on Feb 10, 2009

  • 1 Answer

SOURCE: Speakers pop and rear speakers cut out of surround sound

Hi,
your problem is a bad solder connection of the relay linked to the lautspeaker sockets. I had the same problem and googled for the solution. Since I resoldered the pins everything is fine. That problem is well known and happens to a lot of Sony receivers.

I can send you a link with a detailed how-to-do solution with pictures, however it's written in german language. But you can use some online translators.

Here is the link: http://www.bmw-syndikat.de/bmwsyndikatforum/topic.asp?TOPIC_ID=28280&FORUM_ID=20&CAT_ID=9&Forum_Title=Geplaudere&Topic_Title=Problem+Sony+STR-DE445

Ralf (from Germany)

Posted on Feb 15, 2009

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.

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Jerry G.

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No sound from rear speakers during test tone usng Sony STR-DE475


I had this problem last night.

To solve it, you can reset the amp by:

1) Put the receiver on stand-by
2) Hold down "MODE" button and press on button
3) "S.F. CLR" appears in the display and surround is back on.


Good luck

Dr Gardner

Jan 21, 2009 | Sony STR-DE475 Receiver

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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.

Oct 06, 2008 | Sony STR-DB940 Receiver

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No sound from back speakers


Remember the rear speakers are called surround... Did you select surround on the unit? if it says stereo then you will only get fronts, select surround to get the rest.

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