Question about Sony STR-DG500 System

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Lock up I found a new sony str-dg500 6.1 channel reveiver on ebay and they said that when the power comes on it goes straight into protect mode.I was wondering if that is fixable??

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Re: lock up

Make sure the amp has good ventilation, mine did it through overheating...

Posted on Oct 04, 2009

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Re: lock up

It probably is but may require a service person to physically open the unit up and do some testing/repair work which can be expensive if you dont know somebody or have the skills yourself.

Posted on Nov 09, 2007

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Turn off protect mode

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Good enws is yout unit is not fried. Bad news is you need to get the protection fuse replaced...

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I've got a Sony STR-K880 Cinema surround system and the remote control won't work it anymore! The only thing it will do is turn the system off when I push the'AV I-O' button and the &#

I had the same problem. Found the fix in this document
STR-K880 service manual
On the amp, while powered off:
"While depressing the INPUT MODE button, press the POWER button to turn on the main power."
You may need to do this more than once.
This switches command mode between AV1 and AV2.

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1 Answer

STR KS2300 PROTECT mode in 10 seconds after power up

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; 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 and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 02, 2011 | Sony STR-DG500 System

1 Answer

I have a Sony receiver STR-DG510. I was playing music through the receiver when it suddenly stopped and displayed/flashed protect. After unplugging everything and trying a different power outlet it still...

Most likley it is a bad channel. Needs output transistors and a couple of resistors. or it may need a pre-amp voltage ic.

Not a repair for your average do it yourselfer.

Jun 30, 2010 | Home Theater Systems

1 Answer

STR-DE845 Stuck in Demo mode, tried the power and ...

To get the STR-DE845 ( or STR-DE945 ) out of DEMO MODE - Turn unit on and HOLD POWER BUTTON FOR A FEW SECONDS ...Turn unit off and when you turn it on again it should be reset ...It worked for me.
( Note : You may need to do this procedure before it goes into its actual demonstration of features ... Press and hold the power button immediately when it initially starts scrolling it's DEMONSTRATION MODE message . )

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1 Answer

New System Just out of the Box and the very first time I turn it on it checks for all the DVD's and then "Protector Puch power" Message. I check all the wires and Not sure how to do test tone as every time...

Straight to power protect mode indicates crossed wires somewhere or otherwise miswired system. Disconnect all the speakers and try to power on to see if it still goes into protect mode.

If it does, read the manual for troubleshooting tips, or return the unit as defective.

If it does not then replace the speakers one by one until it returns. Check the wires going into that speaker, that speaker may be defective or you may be wiring it wrong.

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1 Answer

RC cable in headphone jack then to power source now ''protect''

This generally means that you've got a short somewhere.  You most likely *don't* need to bring it in for repair.
If you're familiar with how your system's set up, do the following: 1) Unplug the receiver from the wall. 2) Unplug your gear from the receiver 3) Plug the receiver back in 4) Plug each individual component into the receiver, and test it as you go.
The "protect" is there to protect you from damaging your system, which is why it still works (sort of.)
If that solution doesn't work, check all your speaker connections.  One may have come loose, and you've got positive and negative connections touching each other.

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1 Answer

Sony STR-D460Z receiver

A common cause are failures in the amplifier output stage, the drivers, and some of the support components. You will have to send the unit out for service.

Jerry G.

Feb 08, 2009 | Sony Home Theater Systems

1 Answer


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.


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