Yamaha RX-V675 Short on amp

[ObsoleteFilms]

I have had this Yamaha reciever for 2 years, and one day it hit a snag. I noticed 'Crackling' noises on the left speaker. I shut it off, then 2 days later I turned it on, the crackling started, then blasted through the left speaker then the reciever shut off, then when I pressed the power button the LED only blinked. It has been sitting on the shelf in my basement for a while, and now I took it up, and opened it up. I checked the power supply, good. Then, I tried the Straight - Info - Tone Control buttons and power button, and it powered up, and said codes - DC PRT : 0 L, and A1-1 DSP MARGIN. Along with that, the Sleep light was blinking and Zone 2 was solid on, even though it wasn't plugged in. I turned the volume on mute thinking it disables the amp, but after a good 30 seconds while searching, I smelled burning silicon, and saw smoke with a fire. I unplugged it and the fire went out on its own. I opened it more, and found a resistor, fully black. Before it wasn't. With the codes showing before the burning silicon, I was able to navigate the menu. I never plugged in a display, maybe that would of shown more info?? Anyway, I dont know what caused the short. Any ideas of what was causing the short? If you need more info, its in the Left Front speaker channel. Thanks, and of course, warranty ended, so its fully Home Fix. Any ideas?

 

[americanaudiophile]

Doesn't sound like a home fix. Your recent actions have made it worse.
If the receiver is an expensive one then a good tech would be needed. If there isn't a local one United Radio in Syracuse NY is excellent.
If it's not a mid to high end model it may not be worth the expense to repair. You could try contacting Yamaha. They might offer you a deal on a "B" stock unit.

 

[ObsoleteFilms]

I recently got back to working on it. I have alot of resistors, so I'm going to try and replace the resistor, and see if it burns or not. If it doesn't after a good 5 minutes, it's highly a dead resistor that blew for loosing overall max current. But I have to say, Yamaha receivers are good at detecting shorts .

 

[wolfpup6]

Hi, i don't know if you will check this site again anytime soon but, I have the same Yamaha with the Same Error DC prt 0 L, i found on in amp section (SL speaker amp) the DC Bias is at -10.0V way to high, iv been hunting for a open resister as everything else test good. did you ever figure out ??

 

[ObsoleteFilms]

Hi, i don't know if you will check this site again anytime soon but, I have the same Yamaha with the Same Error DC prt 0 L, i found on in amp section (SL speaker amp) the DC Bias is at -10.0V way to high, iv been hunting for a open resister as everything else test good. did you ever figure out ??

No, I just gave up on the project and just bought an Onkyo. They have more features and are usually just better.