Hi, I got Yamaha RX-V677 which doesn't want to start. No standby LED either. I inspected power board and no problems there. 5.6v to digital board, AC power detection etc measures correctly. I check signal going to main IC and all looks fine there. Inspected vcc pins on main IC and 3.3volts goes there. Same for EPROM. Same for the button 3.3V pull down and trace back down to logic shifter. Disconnected some cables that are not necessarily to start didn't helps either. I am a bit puzzled as I am not sure what other criteria must be met to allow unit to boot. Has anybody seen this kind off issue or might have some other ideas where to look. Any input more than welcome.
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Re: Yamaha RX-V677 no response
I think I am getting close. I started to look into other power sections and I found that on Both IC944 and IC943 there is no Voltage coming out. 5.6 V goes in but nothing goes out. Schematics in the attachment. Any advise more than welcomeAttached Files -
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Re: Yamaha RX-V677 no response
Those ic's both have ENable pins , the ic's are likely not turned on. As for the micro, check the reset circuit.Comment
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Re: Yamaha RX-V677 no response
You are correct lack of enabler to run DC-DC converters. As you said I looked at Reset circuit and I draw attention to DFF_FROM_N_RST line which is connected to D type flip flop IC81. This sends enable signal to DC-DC converters giving other voltages on digital board.
DFF_FROM_N_RST line comes directly from Microcontroller IC83 pin 92. Signal stays high at this line and D entry on flip flop which comes from same microcontroller is low. If I am correct to get flip flip to pass correct output I need D to be high as well.
Is there a chance that EEPROM is corrupted?Attached FilesLast edited by MaLe20; 02-14-2022, 02:16 PM.Comment
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Help Needed: Yamaha RX-V485 Network Issue After Firmware Update (WN9711 Error)
Hi everyone,
I'm facing an issue with my Yamaha RX-V485 receiver. During a firmware update, the process failed, and now the USB, Bluetooth, and network functionalities are not working. Occasionally, the receiver displays the error code WN9711.
I came across Yamaha Technical Bulletin No. 0103, which describes a similar issue for models like the RX-V4A, RX-V6A, and RX-A2A. According to the bulletin, the issue can be resolved by shorting soldering points (e.g., J260 for RX-V4A or... -
I have an old Yamaha RX V675 receiver which is starting to develop issues with the sound, although it doesn't quite match up with what folk normally report with these.
From cold, the sound cuts in and out. When this happens the amp is losing sync with the optical input (speaker graphic disappears from the front panel). But this is not resolved by putting the unit into pure direct mode. After a couple of minutes this resolves, although there are occasional clicks from the speakers after that.
At first I thought it was either a speaker relay or the DSP, but I don't think... -
Hi.
I have an old YAMAHA CLP-550 without sound. (Some times I can get some kind of noise or distorted sound)
I have replaced all green marked elements, but it gave me nothing.
The IC12 chip LC9116A-105 (red marked) remains under suspicion yet.
But it is custom YAMAHA's chip, and I can't find any information about it.
Maybe somebody came across with the same issue?
Any information will be very useful. I will be very appreciated.
Thank you.... -
Hello Everyone,
Greetings!
It has been very long time that I opened up my garage again because I got something that I could not stop myself and this time I have a Yamaha RX-A1020 super powerful (at least from inside structure 😉 ) AV receiver. When this unit came to me this Saturday it was full of dust and what not but the standby LED blinked when pressed and power relay clicked once but no display. It worked 3 times after normal reset like other Yamaha receivers and then again it had to be unplugged to get his behavior back. I opened everything and cleaned it up and...09-14-2024, 11:25 AM -
My friends Yamaha RXv-485 receiver has stopped communicating on network and Bluetooth, we decided to make a firmware update from USB stick but after a while it comes up with the message "unknown".... Its the latest 1.87 version we are trying to load and it seems like the is no firmware in it at the moment as it does not state the old version ?
Any ideas how to resolve this issue?​
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