Question about Yamaha RX-V475

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Power shut down due to protection circuit activated 3 times

Does anyone know how to re-set the power after it was shut down due to shorting of speaker wires. The standby indicator blinks when the power button is pushed. The manual says to bring it to a repairer, but there must be a way to re-set it.

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I had the same problem with my RX-V475. Then I read Rakan Sambas' answer and tried it. It did not work exactly like he said. The reset was possible only when I pressed three buttons at the same time: Power + Info + ToneControl.
Fortunately the Receiver reset and now is working perfectly. However, it was not possible to identify any reason that would justify the receiver entering into auto-protection mode, because there was no short-circuit in the speakers or speaker wiring. This is not good because the problem may come back.

Posted on Jun 25, 2017

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I had the exact problem with the same model. The way to reset it to the factory default is quite easy (you will lose all previous settings). first , Make sure that it is plugged. Then press on the "info" and the "tone control" at the same time. Keep pressing for a few seconds. you will hear a "clicking" sound and the receiver will turn on.

Posted on Mar 20, 2015

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Posted on Jan 02, 2017

Midwest-tech
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SOURCE: power reset

that is actually a sign that the reciever is bad. it usually means the amp is blown. Not in the sense that it wont work. But its overheating and thats where the problem lies. In your case it could be causeing a short. for this reciever it only costs 130 for the pcb board that goes bad. I know no one likes to hear that there stuff is broken. But when i worked for Square Trade i seen a few dozen of these units come through and it was always the amp which can still be serviced by yamaha. -Thanks Nate

Posted on Jun 14, 2008

  • 2 Answers

SOURCE: Shuts off everytime i turn it up pass 4.

Speaker wire contact with each other is the problem. Check the back of ALL SIX speakers including sub-woofer. You should find wires contacting each other. Fix that and your problem will be solved.

Barry Scholles
Strasburg, OH

Posted on Dec 30, 2008

  • 814 Answers

SOURCE: Yamaha HTR5830 shuts down when any front panel button is pushed

You are having a component failure problem in the switching circuit. This unit should be taken in for service. Since it is going into the protection mode on any switch operation the failure is serious and needs to be repaired before it causes more damage to the receiver.You can call this number to find a Yamaha service center near you. 1-800-492-6242. You can also go to the www.yamaha.com website. go to the support section and put in the model number of your receiver and check out the frequently asked questions and troubleshooting sections to see if someone else has had this problem and had a repair solution printed. I hope this helps you with your problem

Posted on May 18, 2009

SOURCE: Yamaha HTR-5760 goes to standby 2 seconds after power on

Maybe your device got the audio amplifier IC damaged

Posted on Jul 02, 2009

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3 Answers

My onkyo tx-rz810 keeps going toDet.pretction mode how do I get it out of that mode


Does the display show you are in protect mode , or is a light indicating that? The unit automatically switches to standby when the
"Hardware" - "Power Management" - "Auto Standby"
setting in the Setup menu functions are set. The protective circuit function may have been activated.
If this has occurred, "AMP Diag Mode" appears on the
display when the unit is turned on again, and the unit
enters diagnostic mode. If the results of the diagnosis is
that there is no problem, the "AMP Diag Mode" display
disappears and you can use the unit normally again. If
"CHECK SP WIRE" appears on the display, the speaker
cables may be short-circuited. Make sure bare speaker
wires are not touching each other or the back panel of
the unit, then turn the unit on again. If "NG" is displayed,
immediately unplug the power cord from the wall outlet
and contact your dealer.
• The protective circuit function may have been activated
because the temperature of the unit rose abnormally.
If this happens, then the power will continue to turn off
after you have turned the unit on again. Make sure the
unit has plenty of space for ventilation around it, wait for
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on again. This is out of your users manual.

General suggestions are to remove all speakers and speaker wiring with unit off. Turn on and see if problem has stopped. If not, let unit cool down if warm and try again later. If problem is still there it needs repair shop work. I fht problem went away, shut off power and connect one speaker at a time and testing. Keep adding speakers one at a time with power off and see if a bad speaker or wire set can be located

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Sounds like the protection circuit is tripping. With power off, check for loose speaker connections. Also, look very closely for shorts in the speaker wires. Even a single loose strand can touch another connection and create a short, which shuts down the receiver.

I would take take the frequency splitter out of the circuit and see what happens. Check for acceptable impedances in the manual. The receiver may not like the load the splitter presents.

The receiver may have settings for bi-amping. Then you use one set of terminals on the back for treble, and a different set for bass.

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I have a 600 watt diamond audio amp hooked up to 2 pioneer 10s the amp comes on but slowly shuts down speakers have sound at first but gets lower as amp light dimms. What's going on. Also I have a boss 20...


Short circuited component/s at amps' audio output stage circuit. Contact any service technician to get it repaired. Short circuit protection circuit is built inside this set, and it will detect the internal short circuit, when it occurs, and will shut the set's power OFF, to protect the speaker and other components. That is happening here.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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From the description your audio output transistors or ic's have a short causing a load problem activating the protection circuit. Turn volume right down, power off, remove speaker wires from the back, power on! if protection kicks on it is the audio outputs in the receiver, if not! check speaker wires for shorts, hook back one at a time until defective wire or speaker is located. The audio outputs will need to be addressed by a technician since there is complexity involved.

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Please check the power supply to the unit, if the fuse or the main power is faultty. Now if the set has tripped then this can be a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's 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 like 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 , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

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2 Answers

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Good Day,

This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times.
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1. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR LEAKY C9A60 470 PF 1000 V PART # 154P400030, PARALLEL TO D9A57 ON THE POWER PCB (NOT SHOWN IN THE SCHEMATIC).

2. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR OPEN FUSES F9A04 AND F9A05 PART # 283P043090 ON THE +24 AND -24 VOLT LINES. IF THE FUSES ARE OPEN THE CONVERGENCE OUTPUT CIRCUIT WOULD BE SUSPECT.

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I hope this was helpful, BIG IRISH.

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1 Answer

Won't Power On...


Hello degaff, This is what I would do to try to determine the problem: 1. Disconnect everything from the receiver. The only thing connected should be the power cord. Make sure the power cord is disconnected from power for at least 30 minutes in order to reset the internal electronic software. 2. Then, power it up - still nothing else connected. If it powers up normally and "looks" like it is going to work, then turn it off and connect only the right speaker to its amplifier and try again. If it still looks normal, then turn it off and connect the DVD or CD player and run some music through that speaker. If it still looks normal, then shut it off and connect the left speaker, etc... In other words go one-by-one in checking it out. 3. If it does NOT power up after step ONE, then there is a problem internally. If it powers up only to shut down again, there is still a hardware problem internally. The usual cause is shorted output transistors. And the normal cause of shorted outputs is a short on the speaker line, a short inside one of the speakers or overdriving the amplifier for too long a period of time. If the outputs need replaced, then it will cost an arm and a leg to get them repaired, and you are better off replacing the unit. The clicking sound, by the way, is the power relay which turns the power transformer on. And if there are faults in the amp, speakers or wiring, the protection circuit shuts the relay off; that is the clicking sound you hear. Please let us know how this works, and if we can help you any further. Best regards, nightdiver

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