Question about Yamaha RX-770

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I have a Yamaha RX-770 Receiver, it suddenly stopped working. I noticed that it had blown the fuse on the board, I replaced it and it blew the fuse again, do I need a new transformer? or is there something else that could be wrong?

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Posted on Jan 02, 2017

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SOURCE: Yamaha AV Receiver RX V2400 - Shuts off

I've been having the same problem for 3 months. Checked connections, sent unit out for repair (3x), contacted Yamaha (no help at all) and still the same problem. I've spent over $350 in repairs and I'm very frustrated. I think I'm going to just buy a new receiver (not Yamaha).

Posted on Feb 17, 2008

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SOURCE: Yamaha RX-V420 No power

If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Dan

Posted on May 12, 2008

killer_clown
  • 86 Answers

SOURCE: Yamaha RX-V870 receiver front right channel not working

There is a fuse in side the system you could try but that sounds like the channels is shorted, but yet again there could be a fuse for it

Posted on Nov 09, 2008

  • 125 Answers

SOURCE: Yamaha RX-V995 receiver turns on & then powers off 2 seconds late

I suggest you run self diag.  press [FM/AM] key + [Input mode] key and press the [power/standby] switch.

ps prt = power supply problem
dc prt = shorted output or leakly cap in channel
tmp prt means to hot on heatsink

you'll likely have to measure the resistances of the output FETs to find a short, 

Posted on Feb 03, 2009

  • 1 Answer

SOURCE: Yamaha Rx-V870

I replaced it with a 6V lamp. Radio Shack part# 272-1140. It cost $1.49.

Posted on Feb 03, 2009

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HI. My Yamaha D80 while playing gave a burned smell and than sound quit. Rest works. I opened rearcover and notice 3rd fuse in the back was blown. Changed it. Blew again. So I stopped fidling around.


If the fuse blows and a smell of burning is present then its obvious there i a fault somewhere ahead of the fuse, the fuse is a protection device.

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It sounds like it is dead, check the manual.

Be sure you have mains power to the receiver, it sounds like that failed. A loose plug or blown fuse could cause that type of problem as well. Here are a few links that may help.

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I tried hooking up an old polk sub to my yamaha rx-v659 av receiver. smelled wires burning smell. before i could unplug it, receiver shut down. now it will power up for about 5 seconds and shut off. manual...


If a fuse was blown, it likely would have no power. However if the power board has overheated, the capacitors may have swelled up and burnt out and will only allow it to power on for a few seconds, then shut down. The capacitors can look swelled up or burnt or have burn marks on the power circuit board. You can test them with a continuity meter. Each component has a printed number of it's voltage and ohm resistance so you can test them.

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This receiver has worked since sept of of last year ...runs about 12 hrs a day all of a sudden, yesterday, it shut down .. checked fuse, it was blown. replaced fuse and it blew as soon as it was plugged in


I see the troubleshooting section of the manual is virtually useless.

First, disconnect all speakers and external cabling. Still blows the fuse? Don't keep feeding it fuses. Take it to a shop.

Otherwise, isolate which external thing is causing it.

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No sound: The receiver has suddenly stopped giving out any sound, regardless on which input I use. Have tried powering off/on (disconnecting all power), and checked front-speakers on another receiver.


That sounds like you blew the fuses inside the receiver. Take the cover off and check them. Typically thats the problem and if I'm not mistaken they are AGC-5 Buss fuses available at your local hardware store.

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there is a bulb inside the backlight on the lcd display.it is 12 volt and alot of manufacturers run it from the +- 15 volt preamp power supply,on the plus rail.when the bulb burns out it can activate the dc speaker protect,or some other 12 or 15 volt circuit..if it is a flourescent display that is a different problem.those run on 5 12 18 and -32 volts.there is also a 6 volt ac filament voltage.you need the schematic.

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This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.

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Sounds like the LED that lights up the display has burnt out. An easy fix, if you're not afraid to take the front panel apart and resolder a new one.

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Doesn't power up


Hallo,my name is Peppe and I am an italian technician (Naples). My english language is not perfect but I try to explain how repair the receiver because the mine have the same problem (don't power on after 4 years of regular use ).
The bad component is the capacitor C405 (22nf 630 v )on the relay power board,the same board where are the two socket for the ac outlet.
I hope that my solution help all the persons wich have this problem on this very beatiful amplifier Yamaha RX-V450.

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