RECENTLY A TRANSFORMER IN MY NEIGHBORHOOD BLEW OUT & MY RECEIVER STOPPED WORKING.
THE POWER PCB RELAY MAKES A BUZZING SOUND & NO LIGHTS TURN ON. POWER PLUGS ON THE BACK OF THE RECEIVER DONT WORK EITHER. NO FUSES ARE BLOWN & INSIDE LOOKS GOOD.
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Re: YAMAHA R-V701 MAKES BUZZING SOUND & WONT TURN ON
This could be the indication of an open resistor, or bad Capacitor in power supply. May not be visible to eye, but if you look in PS. there should be atleast one big sized cap and every PS has a bridge rectifier, this is usually 4 diodes in series, check them and see if any open, shorted
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Can you tell where the buzz is coming from? I think what may be happening is one of the PMW transformers on the power board is making the noise, when you unhook the LVDS cable (main to timing board) the load put on the power supply drops because the timing board uses a fair amount of power and the transformer(s) quit buzzing. It's very possible I'm wrong on this but I've seen this happen before. Another thing is you said the set works ok, if there was an issue with the tcon the set wouldn't work. Try to isolate the sound, if it's coming from the power board you could order a new one or just use it the way it is as it shouldn't hurt anything.
NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING. Turn the volume control to something medium. The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.
Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.
There is a good chance that a common control may have developed a high-resistance or 'dead
If you are blowing the mains fuse, you likely have an issue in the power supply. This can be a bad rectifier or filter capacitor; or, less likely, some other component. The fact that you're asking the question suggests you should not try to fix this yourself.
Usually a buzzing relay is an indication that AC has snuck into the circuitry. 99.999999% of the time, relays in home theatre amps are DC powered. If you power the relay with AC, it will buzz . I think you have a serious problem, that requires a service tech. Is the unit under warranty ?.....If so...great. If not, then I suggest you take it to a Yamaha shop, just because thay have access to all the necessary electrical diagrams and service bulletins. It may be possible that there is a factory modification out to correct an existing production problem with that unit, that only shows up later. If so, you should be eligable for the upgrade from Yamaha. If the unit is NOT under warranty, and it requires a factory mod, you may be eligible for a goodwill repair from Yamaha. Best of luck....Rob