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Sony STR-k840p - Protect is flashing

The receiver is in protect mode, and there is nothing connected to it. It turns on, the relay clicks, and it is not in protect mode for about 5 seconds. Then it goes in protect mode.
I have no speakers, or inputs connected. Nothing is plugged in, except the power cord obviously.
Any suggestions?

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walesarumi
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SOURCE: My receiver is in protect

Hello,

Your unit being stuck in protection mode is an indication that its having a power problem. Remove its plug from the wall and fix it back into the wall, then turn it on again. If its still stuck in protection mode, then the power supply board in the unit is the cause of the problem. The receiver is trying to avoid further damage, that's why it is on protection mode. Its protecting the receiver. This was how the manufacturer programmed it.

The power supply board might be defective and maybe that's why the unit is on protection mode. Its receiving power but it cannot transfer the current to the necessary part of the unit because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the unit might function.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Posted on Jan 26, 2011

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Jan 01, 2016 | Sony STR-K840P

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My receiver, a sony str-k840p, is in protect mode. how can i reset it?


Hi,

The receiver will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. verify that none of the speaker wire connections are loose at the back of the receiver or at each speaker. And verify that none of the wires are making contact with each other.

if it is, then remove the speaker wires and connect them again properly. After disconnection g the speaker wires, unplug the receiver for 10 to 15 minutes. This will make the overload protection back to normal

Try this and let me know. I hope this would solve the issue

Good luck.

Apr 13, 2011 | Audio Players & Recorders

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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

Str de 435 I was watching a movie nothing was being moved when suddenly I heard the relay click the protector mode came on thank you


Relay click and Protect display indicates that receiver got problem in output amplifier section and most probably output chips got defective. This kind of problem is not user level repair and local repair shop will help you to get it fixed.
Thanks.

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Sony STR-DE475 receiver ''protect'' problem


The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.

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

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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


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.

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

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Stuck in protect mode


Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

Nov 23, 2007 | Sony STR-DE425 Receiver

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