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My stereo says "protect" when it comes on then it powers down

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The protect messing indicates that a problem was found in the final output stage of the amplifier. To prevent further damage, the system shuts down. The typical problem are the output transistors which can fail. They are usually shorted. Expect a parts cost between $15-$40. Add in the local labor rate for the total repair cost.
Dan

Posted on May 29, 2008

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My sony fm stereo/fm-am receiver str-de505 reading " protect " but it only activates the auto protect function when i raise the volume.....What do u think?


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

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 'nekkid'. 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.

Sep 21, 2011 | 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

1 Answer

I have a Denon AVR 1905 stereo receiver. It turns itself off after a couple of seconds. I've already tried "reset."


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.

Jul 07, 2011 | Denon AVR-1905 Receiver

1 Answer

My brand new home theatre (SC-PT580) shuts down 5 seconds after i power it up and the message "F61" flashes for half a second. I read the user manual and it says "check and correct the...


As they, if you want a guarantee, buy a toaster. There is no way anyone could ever assert a problem will be forever fixed.


If you Google ore even just search Fixya for "F61" you'll find a zillion hits, so it's VERY COMMON.


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


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.

Feb 13, 2011 | Audio & Video Receivers

1 Answer

Protect mode. will it work again? how can "i" fix


This indicates a load on the system, turn receiver off, remove speaker wires from the back of the unit. Now power up and turn volume right down, if the word protect stays off, there is a short in the wires or one of the speakers. But if the word protect comes on, "with wires and speakers dis-connected, it means there is a short in one or more of the audio outputs in the receiver. If you are handy using a digital meter then you may be able to track the shorts down, and replace the parts to get it up and running, also if you can solder then it will make the job easier.

Feb 08, 2011 | Onkyo TX-V940 Receiver

1 Answer

I was playing some music pretty loud today on my Sony STR-DB790 and then no bang no crackling just strait to protect mode turned stereo off thinking nothing of it and now every time I turn it on strait to...


There is an output load causing the protect to engage, turn unit off and dis-connect the speaker wires from the back of the receiver, this will reset the processor ic. Now power on and turn volume right down, if the word protect stays off it means there is a short in the wires or one or more of the speakers. But if the word protect comes on with the "speakers and wires dis-connected" it indicates a short in one or more audio output ic's and will need a tech to address the extent of damage and cost.

Feb 06, 2011 | Sony STR-DB790 Receiver

1 Answer

When i turn on my stereo system it shows "protect"


Hi,
Protect mode is an error code detected by the processor. A lot of possible fault is caused by this error code. This maybe external connection or internal problem. First dis-connect all the input/speaker/antenna connected in the unit. While it is unplug on the wall power it on for a min to drain all the stored electricity on the cap. After this you can try to plug it and power it on. If the symptom is still there this is an indication that you have an internal problem. If the unit works normally then the problem is between what you have been disconnected. The high chance of fault is the speaker wire or the speaker itself.
I've advice you to send it to repair shop to isolate the problem because the caused might coming from the bad power supply, fault in pre-amplifier stage, fault in output IC. This is quite technical.
Also check if the unit is under warranty before taking any action which will void the warranty.
Hope it may help you.
Have a nice day!
JDVillanueva

Feb 04, 2011 | Audio & Video Receivers

1 Answer

My Pioneer VSX-454 stereo receiver, put up an "overload" in the display and shut down. I have had this receiver for several years and this is the first time that this has happened. Is the...


The protection circiuts detected false more likely in the audio power amp circuits. Turn off all the speaker outputs or disconnect all the speaker wires to see if the fasle gose away. If it is power amp problem, it will cost way too much to have the shop troubleshoot it down to component level.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Dec 24, 2010 | Pioneer VSX-454 Receiver

2 Answers

My Stereo Is Always On Protect Can It Be Easily Fixed


Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

May 27, 2009 | Sony Audio & Video Receivers

1 Answer

I have a Pioneer SX-850 Stereo from the 70's that just stopped working. When powered up all the lights, knobs, buttons, switches, etc. work, but no sound comes out. I also do not hear that distinctive...


Hi and welcome to FixYa,

That distinct click is the relay activating. It is the built-in protection common to designs of this period. The only time the relay will not activate is when the protection circuitry has detected a fault in the amplifier/output stake. This would call for replacement of the defective components most likely a transistor complimentary pair or in some instances a large IC power pack.

Good luck and Thank you for using FixYa.

Dec 07, 2008 | Pioneer Audio & Video Receivers

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