Question about Sony Str Dg500 Stereo Receiver Digital Audio Control

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"protection", no sound. What happened?

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Usually means there is a short in the amp. Would have to go in for repair.

Posted on Jan 17, 2013

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Posted on Jan 02, 2017

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The power supply regulator section should be troubleshooted. The "Pop" sound you heard might be of a bursted electrolytic capacitor in the AC mains rectifier section inside the TV. All the related commponets, rectifier diodes, protection zener diodes etc:- should be checked before switch ON the TV further.

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The problem is in the audio output semiconductors, they have shorted causing the fuses to blow and it is in auto protect mode to prevent further damage. I recommend a professional to assess.

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How do I go from "Protect: mode back to FM play on


The word protect will engage when you have output problem and will shut the audio off so no sound is available, however if the sound is working normally with protect visible then there is clearly processor issue, something I have never seen before. But it should be checked by a qualified tech.

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I have a Sony STR-DE845 5.1 Channels Receiver and it has been functioning flawlessly for years. Recently though, it has started producing a loud "pop" sound within a minute after turning it on....


You probably have a discrete component failing inside it.


Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

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How long is a piece of string?

A list of parts is not going to indicate whether you have connected or installed it correctly. Have you put or attempted to put software on the drive? Is the HDD partitioned and formatted? No drivers installed for video or sound... unless you have an operating system installed.

Too many variables to answer this question, without details of what was done or wasn't done Hardware will operate to some degree even without op system ( monitor and satac DVD drive)

Thanks for using FIXYA

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Cannot turn protected mode on or do system restore


This will delete everything and set computer back to factory. Save all pictures, music, etc.

1. Copy all your files and documents to an external storage device.
2. Shut down the computer.
3. Turn the PC back on and hit the F8 key repeatedly until the Advanced Boot Option Screen appears.
4. Click "Repair Your Computer" if you are not already on it and then press ENTER
5. choose your country and click OK
6. On the "System Recovery Options Screen" click "Restore Application" which is the last option.
7. Follow the on-screen instructions
8. When prompted, click on "Full Factory Recovery"
9. "Next"
10. Click "Yes"
11. you will notice for a while it seems like nothing is happening, give it some time.
12. After some minutes, recovery will complete and you click "Finish"

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