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Sony STR K840P, protect mode is flashing,no sound,nothing come out. When starting every thing is fine for 20 or 30 seconds and the "protect"start to flash and nothing geht anymore,everything is blocked

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This is a classic problem. One of your speakers is miss wired and or your speaker wires positive and negitive leads are touching. Check all connections from the back of the reciever to the back of the speakers to make sure your positive and negatives are correct and that none of the wiring is crossed or touching one another.

Posted on Jul 25, 2009

  • 24VALVE Aug 23, 2011

    what if all wires are fine and it still go in the protection mode

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Posted on Jan 02, 2017

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Jan 01, 2016 | Sony STR-K840P

1 Answer

We turn on our sony STR/K840P receiver and it wont work the only thing it is doing is flashing protect wires are ok is it a parent lock if so how do we turn it off


No, it's in trouble.


Generally speaking, an amp protects 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. Eure 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.

Feb 28, 2011 | Sony STR-K840P

1 Answer

Hi i am a new member and i have a problem with my str-k840p it started to have a protect mode flashing and I can't hear the at all the tv or speakers. What could i do i check all my connection and they...


Hi,
Protect display indicates that receiver is in protection mode due to some serious problem in output amplifier section and most probably any output channel output chips got shorted out.
Protection mode turns On to avoid any further damage in receiver. If your Sony STR-K840P is under warranty then call numbers written on warranty documents to ask warranty cover and if unit is out of warranty then either Sony service center or local repair shop will help you to get it fixed, it is not user level repair.
Hope these info will help you.
Let me know if you have additional question.
Thanks.

Nov 29, 2010 | Sony Audio Players & Recorders

1 Answer

My sony STR-DE695 flashes protect with nothing hooked up except the power supply. Is it a grounding problem, or something else?


if it is in protection mode with no speakers connected, then youve got an internal problem which will need repaired

Feb 23, 2010 | Sony STR-DE695 Receiver

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Sony DE-445 reciever flashes PROTECT


Sounds like a grounding problem. If the ground plug isn't missing or loose try plugging it into a different outlet.

Jun 13, 2009 | Sony STR-DE445 Receiver

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Surround sound won't work


Try Googling (sony)(STR-K840P)(manual) without parens.

May 25, 2017 | Audio Players & Recorders

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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 Audio Players & Recorders

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"Protect" flashing on STR-D665 Receiver


Check if you connect corectly the speakers wiresnand if they are right connected the audio amplifier Ic are damaged

Nov 28, 2008 | Sony STR-D665 Receiver

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Sony "Protection" mode - STR-DE725


My sony used to do that to umm cant remember the model but yeh i could play it at low volume but as soon as i turned it up it would start clicking and telling me to turn of the power...

I resolved it by checking every cord connected to it, it turned out that because I connected two speaker cables together i didnt seal it properly and they were touching this was making it go into protetion mode.

Nov 25, 2007 | Sony STR-DE725

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