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What failed component causes protection error message to display right at power up.

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  • mvaia Jul 04, 2008

    I have the same problem with my Sony V444ES receiver. It will power on and functions well for a period but will often cut out after a loud "pop" followed by a flashing PROTECTION message. If I power it down for several seconds, sometimes it will come back on and play fine for another period. Usually, though, it "pops" again and I have to power down many times before it works again. Needless to say, this is extremely annoying and I would like to figure out why it is happening. Any suggestions? Thank you very much for your help.

  • JIAN2100 Aug 17, 2008

    I have a Sony STR-DG500 Receiver. The same problem !! Eror message"PROTECT" showed up when powers on. I had opened its case and discovered that there's a blown-fuse. Then I replaced it with a same type of fuse. When I powered it on again, self-detection goes about 10 seconds, an eror message "protect" came up. After that, the reciever shut down itself.

    Anybody with any idea what went wrong?

    Thks....

  • mgb1976 Oct 26, 2008

    I have a Sony STR-DG500 with exactly the same problem as JIAN2100.

    Does anyone have a fix for this?

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Well, i just got this thing from a friend. its a Denon AVR-800. when powered up it displays the stops, just before finishing a -protect- shows up. There's a little red light standby light that blinks off and on also. i think that has to do with the internal problem. any suggestions?

Posted on Sep 22, 2008

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Can anyone help. I have an older Denon AVR 800 receiver. I was experiencing a problem with it going into protection mode and finally it blew a fuse. I replaced the fuse, but as soon as I turn it on, it blows again. Can anyone tell me how I can fix it?

Posted on May 06, 2008

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The protection message indicates a problem was detected in the final stage of the amp section. It could be as simple as a voltage regulator problem or the output transistors have failed. If you can provide the make and model, I should be able to give you the most likely parts.
Dan

Posted on Apr 03, 2008

  • DeniseGreg Houghtaling
    DeniseGreg Houghtaling Nov 21, 2013

    Yeeaa; just wondering about "protect" mode on a Denon AVR-610 AV sorround reciever. It was on while I was working in the area and started sparking (top was wet from my sweat so that is the probable culprit) and smelling like burnt electronics. I have top off and cannot find burnt parts, two fuses seem intact... Thanks

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1 Answer

If a malfunction of the STR supporting the amplifier can courses displaying protect


Your Sony receiver is in protect mode because of component failure or overload. The cause has to be found and corrected before you can use it again.

Aug 19, 2016 | Sony Audio & Video Receivers

1 Answer

Receiver displays "protect" ...then shuts off


From what I have seen..........

Either you have a speaker that is shorting out, Try unplugging on speaker at a time and turning the unit on, and see if it goes out of protected mode. Keep the volume turned low while doing that. Just go by process of elimination. Or you can disconnect all speakers and see if you still get the error message. If not then connect 1 speaker at a time, if it goes in to protected mode while doing a speaker connection then you found the bad speaker.

Otherwise another thing I read a hard reset you should be able to do on the unit is hold down the power button until it display a message that says "Clear All", then hit enter or follow the directions it gives that should reset the alarm code if the receiver will allow it.

Hopefully one of those 2 things will clear your error........

Best I could find out

I would do the speaker test first, usually its a shorted speaker or wire

Aug 25, 2013 | Sony Audio & Video Receivers

2 Answers

My teac ag-790a 'protect' error message on display. When I brought it to the audio shop for repair it worked fine; at home again the same problem? What is the problem? Tx.


Hello
Check the putput wirings to speakers. If any of them has short circuit, the set will go to protection mode. You can understand it well, as it did worked fine at the repair shope. The set has no fault at all, but the wirings, connects to it have.
Just power ON the set at your home, without connection any output or input to it. See, it will not show any protection mode display. Switch it OFF. Connect the output to speakers, one at a time, and switch ON the set. Just do it for all other speakers. This way, you can find out, which speaker line causes the set to go to protection mode. Fine out the reason.
Never connect any input to the system, until works fine with out showing any protection display.
I helped you somewhat fine, I assumes.
Ok.

Jan 31, 2012 | Teac Audio & Video Receivers

1 Answer

My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio & Video Receivers

4 Answers

My receiver is in protect mode, and there is nothing connected to it. It turns on, the relay clicks, and it is ok for various periods of time, depending on the off time. Then it goes into protect mode. I...


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.

Jan 26, 2011 | Sony Audio & Video Receivers

1 Answer

Trying to hook up sony s-master with componet cables an the s-master displays on the display ''PROTECT UNPLUG'' however with nothing plugged in the s-master, works fine


Hi,
Check speaker wires, any wire seems shorted and causing Protect Unplug error message in receiver.
Good way to sort out bad wire is plug one speaker at a time, turn On receiver check, turn Off, then plug next speaker wire until you find out what speaker wire activates protection circuit of receiver.
Thanks.

Jan 01, 2011 | Audio & Video Receivers

2 Answers

Protection error in denon avr-3000


Hi,

Do you know what caused the protection shut down in the first place? Did you short your speaker wires even briefly?

You could try to Unplug the Unit for Few Minutes, say 30 minutes and then turn it back ON.Usually that would fix the issue.

If you are going into protect mode with no speaker attached,chances are that your output Ic is in need of replacement .This is the most likely cause of a protection error that you are experiencing.I am having a bit of difficulty in locating specific part numbers but feel confident that replacing outputs will remedy your concern.For further info and parts or authorized service locations in your area I suggest to contact mfg at www.usa.denon.com/ .Click on support or call(201)762-6500.I believe that they have a flat rate service and will give you an estimate.

Still, on the remote possibility that it is just a glitch caused by momentary power interruption or fluctuation, try to re-initialize the microprocessor, a hard reset (not unless this is what you were referring to as rebooted). The reset should force the AVR-3300 to revert back to factory defaults removing glitches, errors in settings & configurations, memory & presets as well as user preferences.

* turn OFF the unit using the POWER button;
* press and hold both SPEAKER A and SPEAKER B;
* without releasing the 2 buttons, press the POWER button;
* release the 2 buttons only when the display starts to flash;
* in the event of no display flashing, repeat the process.


Should the above be not corrective, then it would be a hardware fault and not just a glitch.


Let me know, if needed further assistance.

Hoe i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jan 13, 2010 | Denon AVR-3300 Receiver

1 Answer

What does the word "Protect" mean in the display? My receiver AG-D9100 works great and then quits and the word PROTECT comes up in the display. If I turn it off it usually starts right back up ok...for...


Something is shorting out and tripping a safety feature that protects the amplifier from damage.

try a few simple steps to see if the problem is internal or external.

First make sure that none of the speaker terminals have any loose strands of wire that could be grounding out the terminal and that no wires from the red terminals are touching the component or the black terminals / wires.

secondly disconnect all but one speaker test it to see if t causes the amp to go into protect do so for the other speakers until one trips the protect mode. If one of the speakers is tripping the protect mode it could be a damaged / blown component.

just for fun make sure your speakers are 8 ohms this can be found on the manufacturers website or in your manual. Its rare but some speakers are 4 ohm and they can cause amplifier issues such as tripping a protect mode.

You may have to evaluate the "value" of the receiver and determine if its worth repairing. Many shops will charge a "diagnostic" fee which may be $40 to $80 and remember that parts and an hours labor may not make good financial sense especially if you are talking a unit that is 5+ years old.

Hope this helps

Dec 31, 2009 | Teac AG-D9100 Receiver

1 Answer

Amp comes on and goes right into protection mode saw the decibel display briefly, received the "Protect" message on the display. can you pliz help me on how i can deactivate the protection....


Protection is usually a sign of overheating or something is wrong at the power amplifier's output.

Theory: Protection is a delay and sometimes an internal test to allow the electronics to stabilize during power up before they are allowed to interact with the speakers. The most common cause of it remaining ON is that a speaker cable pair is shorted. Some isolation is required...

1. Turn the Power OFF.
2. Disconnect each set of the speaker wires that are directly attached to the receiver. Mark them so you remember where each one went. pay special attention to which conductor is on "+" or "POS" and which is on "-", "COM" or "Ground". You may elect to disconnect them one pair at a time if your sytem is complex and you don't want to lose track of where things were.

Turn the Power ON. Is the "Protect" indication gone from the display?
--------------------
If YES, you have a shorted speaker wire or speaker. To isolate the specific cause:

1. Turn the Power OFF.
2. Attach ONE speaker wire pair at a time and test it by turning the Receiver ON. When the "Protect" light returns you have isolated at least one of the cause(s). Disconnect the defective speaker cable and continue isolation of all speaker cables. Visually examine the cable at both ends for frayed wires that could touch each other or contact metal on the receiver or other objects.

To isolate further within the cable/speaker pair - disconnect the speaker end of the cable on the failing path. Try another cable that you know works, or at least one that doesn't cause Protection to stay on.

If you're electrically savvy and have a Digital Volt/Ohm Meter you can troubleshoot the short(s) with it.
-------------------------

If NO, there is probably an internal problem.

Is it solid or does it come on after the Receiver has been ON awhile.
It could be overheating.
Is the unit hot to the touch?
Is there a cooling device (fan)?
Is it stopped or clogged with dust?
Is there adequate ventilation around the unit for air to flow?
Clean any ventilation slots on the top and bottom of the unit.
Avoid stacking components that produce heat under an amplifier or receiver. Their heat rises. Also keep them away from other heat sources like like home heating vents and radiators.

Problem solid and NOT related to the speakers or heat: internal malfunction.

Let me know.

Apr 06, 2009 | Onkyo TX-DS787 Receiver

1 Answer

Shutdown protection? HELP please


All of the Denon recievers I have repaired (over 100) that shut down after a very short time are going into protect mode. The display lights up and after about 10 seconds the display goes out and the standby led blinks red.
I have found that they have one of 3 possible problems and they all require that the reciever be taken apart and fixed at component level. No way to tell what your problem is until it gets put on a bench and troubleshot.

Problem 1. This is the most common problem. One of the front channels shorts out. On the big heat sink the front channels are at each end. It is the front left channel (close to the display) This requires that the output transistors be replaced as well as some driver transistors and some resistors and a capacitor. Lots of work for a blown channel. Denon has put out a bullitin to upgrade the bias transistor and change a couple of resistors to help compensate for this failure. That channel overheats more than any other channel.

Problem 2. There is a resistor that is right next to the preamp board that opens up. It is a 10 ohm 1 watt resistor and when it opens, it causes the unit to go into protect.

Problem 3. The +12 volt regulator fails. It is in the power supply area on a smal heat sink right next to the -12 volt regulator. Generic part number is KIA7812 It also causes the unit to go into protect.

Most decent repair shops can fix these from about $120 up to about $200. Depending on which problem it is and how fast they are at finding the problem. Most charge labor by the hour.

Sep 06, 2006 | Denon AVR-1603 Receiver

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