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Amplifier has no power and all the cables are correct. i tried another amp, and it goes into protect mode.

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Hi!

I know you say all your cabling is correct and I don't doubt you at all. However, the problem you describe sounds an awful lot like a short or an impedance problem with your speaker wiring. Make sure that the ohm ratings for your speakers are correct for your amp, make sure that the + and - wires for each speaker don't touch each other (especially easy to do where they connect to the amp), make sure that no speaker wires are cut or crimped (easy to do if you are burying under a baseboard or something), and finally make sure that all the speakers are wired correctly and are in phase.

A good test procedure is to remove all speaker connections from the amp. Then run new (test) wires from the amp to just your front speakers or to two known-good speakers with correct ohm impedance. If the receiver works that way, it tells you that you have a problem somewhere in your wiring.

Good luck and please let me know if this helps.
Bob

Posted on Oct 09, 2008

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2 Answers

Why is HDMI LED blinking and there is no power to the amplifier?


I assume that you are connecting your amp to a hi-def TV. Can you try out the TV stand-alone and see if it works? Perhaps there is a problem with the TV. The blinking light tells me that there is a HDMI related problem. What is connected to the HDMI? Check the cable and make sure both ends are connected properly. Disconnect the HDMI cable and see if the amp will turn on. Does it work? Do the lights on the amp come on? Give us some more details. Try the above and report back.

Jul 21, 2015 | Audio & Video Receivers

1 Answer

Denon avr789 shuts down when we try to increase the volume above say above20 is there a reason for this


The amplifier goes to the protect mode as there is heavy drain in the outputs- the MOSFETS.
This can be due to fault in the input signal, a poor DC regulation or a faulty speaker.
Disconnect all speakers and test one by one to confirm. Also make sure that the input signal is good, try with another source . Test also with the different input selection on the amp so as to confirm if the pre- amp is faulty.
Sometimes faulty capacitor in the sub power can give low regulated output and thus on load can shut down . finally check the input supply voltage, it should be correct or on load it can shut the amp.

Oct 01, 2011 | Audio & Video Receivers

1 Answer

Goes straight to protect mode, detached speakers, still same problem


HI, if the unit is in protect mode then there may be the possibility that the speaker wires may have a short circuit in them or that the amplifier section may be damaged....you can remove the radio from it's sleeve and check the wiring behind the unit...this also would have to be done to see the model number and serial number...it should be on either the top or bottom of the unit...the speaker wires for this unit are the white, gray, green, and violet...each with another of the same color but has a black stripe in it...the black stripe is the negative side of the speaker wire....you can disconnect these wires, then turn on the unit to see if it comes out of protect mode...if it does, then there is either a bad wire somewhere in the car or a bad speaker...if the unit stays in the protect mode, then you will have to take the unit in for repair, as this indicates a circuit failure

One of the more confusing car stereo problems can be when an amplifier goes into protection mode. One minute it's working and the next minute it's not, usually with the green power LED on the amp turning to red or orange. Here's a brief troubleshooting method that will hopefully help you if your amplifiers ever go into protection.

1. Try to determine the cause. Amplifiers can go into protection mode for several reasons. Knowing what happened before it quit working can help determine how to fix it. Did the amp malfunction as soon as it was turned on? Did it happen after blasting for hours (may be thermal overload and it needs to cool)? Did it cut out after you hit a bump (a wire connection may have come loose)?

2. Tear it down. Get the amp down to it's most basic state. Remove all of the speaker wiring and RCA wiring and leave only the power, ground and remote leads connected. If you still have a problem in this state then either your amp is defective or you may have an installation problem such as the amplifier touching metal.

Remember that an amplifier should only be connected to the vehicle through the power and ground terminals. Mounting the amplifier to the metal of the vehicle, including putting the mounting screws into metal, can cause problems for your amplifier. Always mount the amplifier to a non-conductive surface. An easy way to accomplish this is to mount the amplifier to a wood board and then mount the board to the vehicle. Don't let the amp touch the screws used to moun the wood board and don't use screws so long to mount the amp that they go through the board and touch the vehicle.

3. If the amp is OK in this torn down state start reconnecting wires until you find what causes the problem. Add the RCA cables first. Then add the speaker wires one at a time. If the speaker wires cause the problem then they are probably touching metal. Check to make sure that a speaker wire isn't being pinched somewhere between the amp and the speaker. Also check that the speaker wire or speaker terminals aren't touching the vehicle metal near the speaker opening. Rear decks and door panels can easily touch unprotected speaker terminals if not properly installed.

If you believe your amplifier is defective contact the manufacturer first. Many have flat repair rates that are very affordable and cover parts and labor as well as return shipping. However local repair shops may be cheaper if it is just a small repair. Compare the manufacturer's repair rate to that of a local shop. If you don't know the reputation of the local shop it may be better to send it to the manufacturer who will have working knowledge of the amp and parts readily available.

Hope it helps..

Aug 10, 2011 | Sony STR-DE698 Receiver

1 Answer

Can't open,in protect mode


Hi:
First disconnect all speakers from the unit and then try turning the unit on too see if it still goes to protect mode. Protect mode is a shut down feature that shuts down the unit because of a shorted speaker or speaker wires are touching each other. If the unit does not shut down after disconnecting all speakers then reconnect them one at a time while turing the unit on after each conncection until you find the shorted speaker. If it shuts down with no speakers attached to it then you have a internal problem with the amplifier section, probably a shorted output transistor in the Amp circuit or preamp circuit.

Jul 08, 2011 | Yamaha Audio & Video Receivers

1 Answer

My denon receiver is stuck in stand by mode it goes on fro about 10 seconds and then shuts off the system, what can I do?


hi,
Your system goes to standby mode after power ON means it is in protection mode.
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jun 12, 2011 | Denon AVR-2807 Receiver

1 Answer

When i turn power on it came on and says protect then turn off..please help


The reason why this is happening is because the reciever is going into protection mode due to a short circuit to the amplifier. It might be a speaker that is shorted out internally or there might be some speaker wires making contact with each other at the back of the reciever or at the speaker. The first thing I would do is disconnect all the speaker wires from the back of the reciever(make sure to label them before removing so you know how they go back). After removing the speaker wires turn on the reciever and see if it goes into protection mode. If it does then there is a good possibility that the internal amplifier might have a short. If it does not go into protection mode then that is good because there is more than likely a short on one of the speaker wires or speaker itself. Now connect one set of speaker wires at a time. After you connect each one try turning on the reciever until it goes into protection mode again. When it does you will have your culprit. Then try swapping speakers with that problem wire set and see if it still does it. If it does then it could just be the wires but also switch the wires to verify that the amplifier does not have a bad channel. If swapping both the wires and the speaker swapping produces the protection mode then that channel for the amplifier will be defective. I hope I have not confused you too much.

Aug 17, 2010 | Audio & Video Receivers

1 Answer

My denon avr1200 receiver once it is turned on goes into Protection mode. How do you reset or make work?


The reciever will go into protection mode when there is a short in the speaker wires or the amplifier was overloaded. What I would do first is verify that none of the speaker wire connections are loose at the back of the reciever or at each speaker. And verify that none of the wires are making contact with each other. Then label each speaker wire as you remove them from the reciever so you can re-install them correctly. After you have disconnected the speaker wires try unplugging the reciever for 10 to 15 minutes. Most recievers have a self-resetting overload protection switch and this should reset it back to normal. Now try plugging the reciever back in and turn it on without the speaker wires connected. It should be out of protection mode now. If it is still in protection mode verify that there is not a reset switch somewhere on the back of the reciever. If it is not in protection mode now then proceed to connect one speaker set at a time and turn on the reciever to see if it goes into protection mode. If it goes into that mode after connecting a speaker then that speaker is the cause of the problem. If it does not go into the mode after all speakers are connected then try turning the volume up. If it goes into protection mode then there could be an internal short on the amplifier or a incorrect OHM rated speakers connected to reciever. Verify that the speakers are rated the correct OHMS.

Feb 22, 2010 | Denon AVR-1200 Receiver

1 Answer

Harmon Kardon Citation 22 amplifier is in protect mode


Maybe there's a correlation to those devices being attached. Float the the amp so it has no cables to anything and figure out why it's going into protect mode. If it doesn't, start adding units until it does.

Feb 04, 2010 | Audio & Video Receivers

1 Answer

MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.


Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Oct 13, 2008 | Audio & Video Receivers

1 Answer

Onkyo Tx-v940 Receiver/Amplifier Protection Mode


Audio amplifier IC's damaged you need to change it.Good luck

Dec 31, 2006 | Onkyo TX-V940 Receiver

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