Question about Denon AVR-1604 Receiver

1 Answer

Protection Light Flashing

Protect Light Flashing. I too have one of these with the same problem,the unit is only 3 years old . I too did the troubleshoot check on both AVR and speakers but still the same . I was sent a sevice manual by Denon and as a result of a quick study of the circuit diagram , I tried diconnecting the jumper link to the processor which is labelled 'Protect'. The effect of this was that when the unit is turned on , the display is now visible as normal , but no sound from the speakers . It seems that the main processor requires a very small voltage from the output of the power transisitors to trigger the main processor to operate the speaker relay circuitry , but when there is an overvoltage ( whether of an intensity harmful to speakers or not) , the 'protect' circuit is triggered and remains so. Can anyone offer some further assistance ?

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  • malcolm robartes Jul 27, 2007

    Hi Techman,
    Thanks for the suggestion . I think what I did confirms that the main processor is working fine . When I checked the speaker outs with a MM before I cut the protect link wire , I had what appeared to be a slight low voltage leakage on the centre speaker with all others being stable .
    Yes I have a PDF of the sevice manual , which I can send you if I can have an email address to send it to.
    Cheers
    Malcolm

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You will need to measure the output transistors as well as the driver transistors or IC's for shorts, as it is a DC voltage that will trigger this protection circuit. If you have a PDF of this service manual, I would like to take a look at it and to tell you what to check.

Posted on Jul 27, 2007

  • Larry  Dillon
    Larry Dillon Jul 27, 2007

    sure send it to techman32k@yahoo.com

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1 Answer

Amp displaying 'protect' and not responding


Disconnect all speaker wires from the unit and turn it back on, if it stays on, turn up the volume, if it does not go into protection, you have a speaker problem. If it does go into protection, it's less expensive to replace the unit than to repair. This unit is 9 model years old and was roughly 200-250 new. Any repair will be at least 100-150 and not worth the investment vs. return. If you look at new receivers, take a look at Yamaha RX-V series. Easy to use and very well built. Hope your current receiver is ok though!

If no Protection is displayed, turn off and connect one spkr at a time and test until you find the one that causes a problem, then try another spkr in the place of the one causing the short. if it still shorts, take the good spkr directly to the receiver with a short piece of spkr wire and test in the bad location. if it works then, replace the spkr wire, if it doesn't you've found your problem. Audio output chip. This is a very common problem and is repairable, yet the labor is what cost the most.
Hope this helps.

May 23, 2009 | Sony STR-DE475 Receiver

1 Answer

Protection on error message


Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Apr 21, 2009 | Samsung HT-TX72 Theater System

1 Answer

Power turns off


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Jan 31, 2009 | Samsung HT-X50 System

1 Answer

Toshiba 50HX81 projection 'tv- blinking red light


The TV is on protect mode.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Jan 27, 2009 | Toshiba 50HX81 50" Rear Projection...

1 Answer

Unit shuts itself off after 10 -15 minutes


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Jan 08, 2009 | Samsung HT-WX70 Theater System

1 Answer

Home Theater Audio System System


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Dec 22, 2008 | Samsung HT-TX72 Theater System

1 Answer

Magnavox MRD-510- when I plug it in, it just makes a clicking noise and the power button keeps flashing. When I unplug this unit it continues to click for 5 seconds. Only owned for about 5 months and now...


Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Nov 30, 2008 | Philips Magnavox MRD510/17 Theater System

1 Answer

Protection error


Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Nov 19, 2008 | Samsung YP-K3 MP3 Player

1 Answer

WIRELESS SPEAKER KIT


That sounds like the transmitter is shorted or faulty. Protection is a diagnostic mode that will prevent the unit from starting because of a fault.
Below a little essay on protection mode, but in your case you should simply replace the transmitter.
Call the phone number listed on the owner documentation to get a replacement.

Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

Aug 29, 2008 | Sony BRAVIA DAV-HDX267W Theater System...

1 Answer

Protector flashing


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.

Oct 05, 2007 | Sony STR-GA7ES

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