Question about Yamaha RX-V475
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.
Posted by Anonymous on
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
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
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
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.
Posted on Dec 30, 2008
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
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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.If the set does not power from the standby the processor IC and allied circuit must be checked. Check the +5 rail to the processor to confirm.
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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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