20 Most Recent Sony STR-DE915 Questions & Answers


I have a sony str-De915 receiver and my surround sound and subwoofer want play even when I play Dolby pro logic

Check your settings on the unit and also the source of the sound. Sometimes it can get switched to PCM by mistake, or can be interfered with by something like a setting for down-mixing, which should be switched off.
3/6/2019 8:37:53 PM • Sony STR-DE915 • Answered on Mar 06, 2019

Sony STR-DE915 Receover, flashing "Protector" when power on

Serious problem either in the power supply or output stages of receiver.
9/17/2017 1:49:47 AM • Sony STR-DE915 • Answered on Sep 17, 2017

I have a Sony STR DE915 amp. It will not power up. I checked the internal fuse (it's OK). Power button has dislodged and may be broken. Am looking for disassembly instructions (not schematic diagr

Simple, if you are not confident in your ablility to fix the problem by dissasembling the boards then by all means, take it to a repair facility.
4/24/2014 8:16:19 AM • Sony STR-DE915 • Answered on Apr 24, 2014

I have a SONY STR

From my experiance I found that the set has a power protection circuit built-in that senses when there is overloading on the power supply. After the build up gets to a certain point it shuts down. Turning it off will reset the protection circuit.

But, lets do a hard reset and see if this will help. Just unplug the power cord for 30 minutes and see if that improves the situation. Could just be a fluke and after a reset it will work fine.

If not, then the cause is some sort of overloading. Could be from using it in a poorly ventilated area. Could be a simple short on the speaker wires; such as one of the hairwire strands touching across a terminal. But most likely it is the age of the receiver and the silicon insulation material between the output transistors and the heat sink has dried out allowing the output transistors to get too hot. Repairing this requires dissasemble of the output transistors from the heat sink and regreasing them. The enclosed shelf units tend to get hot and over time the grease and other components dry out and crack causing shorts like this. If you aren't capable of dissasembly of the circuits then I would have to recommend you get someone who is or you can cause more damage than good, then you will have to weigh the cost of a new amp vs the cost of a repair, in my opinion a new unit would be more cost worthy that repairing an older set. But if you can succesfully track down the short you will be money ahead.
2/26/2014 8:00:28 PM • Sony STR-DE915 • Answered on Feb 26, 2014

I have a SONY STR DE915 receiver home theater amp.

There are internal fuses that you can check. This model was notoriously bad for amp problems. These amps would burn up a lot of components when they go out.
10/11/2013 8:07:57 PM • Sony STR-DE915 • Answered on Oct 11, 2013

Sony STR-K660P Intermittent sound problem

5/14/2012 1:32:43 AM • Sony STR-DE915 • Answered on May 14, 2012

No sound out of front and surround speakers but center works

Replace transistors Q703 and Q503Sony P/N 8-729-422-57Transitor P/N UN4111
on Apr 26, 2012 • Sony STR-DE915

My screen keeps flasing protector

bad ground or fuse.
2/6/2011 3:29:01 AM • Sony STR-DE915 • Answered on Feb 06, 2011

The word Protected shows up

Protected is usually the unit has partially shut down to prevent further damage or burning up. The high power amplifier section is shorted or the speaker wires are shorting, including speakers. The speaker wires can be checked and eliminated as a problem, where frayed wires are touching the other terminal or a bad shorted speaker. If all external short have been eliminated, a technician would have to fix internal short.
11/16/2010 12:21:44 AM • Sony STR-DE915 • Answered on Nov 16, 2010

Rear speakers do not work

Make sure of what audio mode you've set your receiver to, as well as what the source audio signal contains.

Some modes, such as Dolby Digital/Pro Logic will adopt the input format, and subsequently use only the front left and right speakers if there are no LFE/Center/Surround channels present. Setting the mode to Pro Logic II or IIx, on the other hand, will force a signal to be spread out to the various extra channels.

Using the Automatic Field Detect mode will usually provide the most appropriate solution for the input signal, otherwise.

Also note that if your audio source is from a PC and you are playing games, some games will, when you are using the digital output of many sound cards (most notably the Sound Blaster Live! and Audigy 1-2 and Audigy SE model cards) output only stereo as their signal, but still in a digital format. Your receiver will pick this up as a stereo specific signal and avoid using the subwoofer, center and surround channels.

Unfortunately, for those cards, there is no work-around beyond using analogue output or getting a more recent, better compatability sound card, as it is a limitation between the drivers, the card and the game in question, rather than your receiver that has the issue.

If the above doesn't help alleviate your issue and/or you could clarify on what your source audio is and whether you encounter this issue with all source-types or not, please post a follow up response.
3/20/2010 9:46:42 PM • Sony STR-DE915 • Answered on Mar 20, 2010
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