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Protect error cant get the amp to work, has "protect" displayed on screen and nothing seems to work, pls help!!!

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Hi,

If your amplifier goes into the protection, there's really something wrong. There are different kind of protections but usually that circuit does see a DC voltage on your speakeroutput.
So it's a protection for your speakers.

regards,
Gerard

Posted on Jan 31, 2009

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Nad av 716 protect


If your NAD amplifier is in protect mode with no speakers connected, it will be necessary to open it up and check for internal component failure.

Jan 05, 2015 | NAD Audio Players & Recorders

1 Answer

When I try to turn the amp on, all I get is a flashing red light flashing beside stand by. Nothing comes up on the screen and nothing seems to work. It's always worked fine before, today it shut off on...


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Mar 14, 2012 | Onkyo Audio Players & Recorders

1 Answer

NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

Jan 23, 2012 | NAD M3 Master Series Integrated...

2 Answers

My Harmon kardon is stuck in protect mode


Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Double check all connections .A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.

Nov 19, 2011 | Harman Kardon Audio Players & Recorders

1 Answer

I have **protect** in my kardon harman avr85?please give me solution


It could be a short in your speaker wire or the crossover in your speakers.

1) Turn off your unit and disconnect your speaker wires at the amp, if the protect is no longer displayed when the unit is turned back on, check the connections on the speakers. If you do not visually see a short on the speaker wire connection, turn off the unit and disconnect the wires at the speaker and isolate them so they do not touch then connect the speaker wires at the amp. Turn on the amp and see if the protect is on. If it is on, the wire has a short somewhere in the line. If the protect is off then suspect the speaker has a short in the voice coil or crossover.

2) If the protect is still on after you disconnect the speaker wires at the amp, it could be the power IC in the amp is shorted and needs to be replaced.

Jan 10, 2011 | Harman Kardon Audio Players & Recorders

1 Answer

I am facing a problem with a SONY amplifier, model STR-DE185. On its screen is written the word ''PROTECT''. I have checked the transistors MN 2488 and MP1620 and are OK. Could anyone tell me what else...


Hi and welcome to FixYa,

Initially, the displayed message "PROTECT" is as it implies, the STR-DE185 has gone into auto-protect mode. The built-in auto diagnostics has sensed a fault and kicked in to prevent further damage to the Sony unit. In most instances, this is brought about by a faulty speaker (should be 8~16 ohms), loose/disconnected speaker wiring, strands of speaker wires inadvertently touching its opposite, overheated, ventilation holes covered, played with the volume level high for an extended period of time or a localized fault in the internal electronics of the amp circuitry.

Offhand, since DIY (do-it-yourself) repair is being done and assuming that you are comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices, access to a Service Manual or at the very least, a schematic diagram would be a necessity.
  1. consider doing a RESET. Turn off the STR-DE185, press and hold the POWER button for 5 seconds or more or till "INITIAL" message is displayed. This would force the Sony to revert to factory defaults removing any glitches, errors in settings & configurations, presets, memories and user preferences;
  2. check if relays RY781 - to 783 are engaging;
  3. check pin 8 of IC901 (should be 5.6V);
  4. check protect switch Q784 to 786;
  5. check overload detectors Q705 & Q706;
  6. check that the MN2488 and MP1620 are not leaky

Good luck and thank you for asking FixYa.

Apr 20, 2010 | Sony Audio Players & Recorders

1 Answer

I have cambridge audio azur 640a amp. Problem I have is only the one speaker is working. Both speakers seem to be ok working off the left speaker terminal. Seems to be problem with output from right...


The fault is on the amp! It sounds like the protection circuit is detecting a surge on the channel and shuts it down to protect the speaker. I would check the semiconductor device(s) for the right channel on the heatsink of the amp. You might even see damage of burning on one!

Dec 29, 2009 | Cambridge Audio Azur 640A Amplifier

1 Answer

Cant figure out why my protect LED indicators continue to go on.. Why is this happening?


disconnect speakers at the amp, turn unit on, if it goes into protect, it needs service. If it stays on, re-connect speaker wires without speakers attatched at the other side and test again. (make sure wires are separated and not touching metal!) if it stays on still, check speakers one by one, when it goes into protection, you have found your problem. Disconnect the bad speaker and test again. Process of elimination. It can only be one of three things. Internal amp problem(nothing connected and protection) wires(no speakers connected and protection) or speaker(s) (when speaker connected,protection) Hope this helps. If you need deeper troubleshooting with this issue, post a comment and I can help you further.

Nov 04, 2009 | Nady Systems XA-900 Amplifier

2 Answers

I have an av316 NAD, surround sound Amp. Just got back from repair. The wires to the speaker may have been reversed when hooking, the amp went into protection mode, can I fix this problem. It wont come out...


Having the speaker wires hooked up backwords will not cause protect mode. If the wires were crossed (in other words shorted), that would. Disconnect all speaker wires, if the unit is still in protect mode, than the output transistors are probably shorted and the unit will again require service. Upon return from service, I would turn on the unit without speakers to insure that the unit at least works that far. Also, if you have an ohmmeter, measure across the speaker terminals. You should read either 3 or 6 ohms. If you read 0, the problem is a shorted speaker that then shorted the amp.

Keep us posted.
Dan

Jan 20, 2009 | Audio Players & Recorders

2 Answers

Amp keeps turning itself down - cant turn off 'protection'


yes,pls.stop plugging the system,you may harm your system if you do so,the system has it's own system analysis mode,and if there's something wrong in the circuitry,it will activate,you need the authorize service center my friend,it's a technical problem.

Dec 09, 2006 | Cambridge Audio Azur 540A Amplifier

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