Hi all,
I have a Yamaha RX-V581 which has started going into protection mode on startup. If I have speakers plugged in when powering it on, I hear a quick loud pop noise before it shuts off.
When putting it into diagnostic mode, the message displayed is DC PRT: 000. I took it into a repair centre, who after taking $120 to quote on the device, who said there's a DC voltage on the rear right channel. They also said it'd be another $360 plus parts to fix it, so as you might expect, I declined.
So far all of the work I've done with electronics so far has been very basic, so an AV receiver with faulty components is all new territory for me. All I've done so far is replace obviously-damaged components on monitors, - not diagnosis. With that out of the way - I have done a bit of scouring online, and have been unable to find a manual for this particular model. If I'm right and the RX-Vx81 series are all similar, I did come across a copy of the RX-V381 manual on Elektrotanya and uploaded it here: https://www.scribd.com/document/4250...service-manual (it was higher than the PDF attachment size limit).
After reading some previous threads here - from what I can tell, I need to check the output transistors - specifically for the surround channels, and that they're likely to be mounted on the very large heatsink inside. And by check, I expect I need to confirm DC on one of the surround channels with a multimeter, do a visual inspection, and then potentially probe for certain conditions. Am I going to ve looking for a short, of a voltage out of spec, or voltage where it shouldn't be?
Do these things care if you power them up without some of the boards connected? I'm not sure how I can get readings from some of these without pulling boards out.
I have also attached a couple of photos of the main board to see if your eyes can spot anything that I didn't.
Let me know if you'd like specific photos, measurements, or have some general pointers.
Thanks
I have a Yamaha RX-V581 which has started going into protection mode on startup. If I have speakers plugged in when powering it on, I hear a quick loud pop noise before it shuts off.
When putting it into diagnostic mode, the message displayed is DC PRT: 000. I took it into a repair centre, who after taking $120 to quote on the device, who said there's a DC voltage on the rear right channel. They also said it'd be another $360 plus parts to fix it, so as you might expect, I declined.
So far all of the work I've done with electronics so far has been very basic, so an AV receiver with faulty components is all new territory for me. All I've done so far is replace obviously-damaged components on monitors, - not diagnosis. With that out of the way - I have done a bit of scouring online, and have been unable to find a manual for this particular model. If I'm right and the RX-Vx81 series are all similar, I did come across a copy of the RX-V381 manual on Elektrotanya and uploaded it here: https://www.scribd.com/document/4250...service-manual (it was higher than the PDF attachment size limit).
After reading some previous threads here - from what I can tell, I need to check the output transistors - specifically for the surround channels, and that they're likely to be mounted on the very large heatsink inside. And by check, I expect I need to confirm DC on one of the surround channels with a multimeter, do a visual inspection, and then potentially probe for certain conditions. Am I going to ve looking for a short, of a voltage out of spec, or voltage where it shouldn't be?
Do these things care if you power them up without some of the boards connected? I'm not sure how I can get readings from some of these without pulling boards out.
I have also attached a couple of photos of the main board to see if your eyes can spot anything that I didn't.
Let me know if you'd like specific photos, measurements, or have some general pointers.
Thanks
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