Chosen Solution
I went to turn on my Yamaha R-N803 amplifier after moving it to a new location. When I pressed the power button, there was a pop/bang sound and a flash inside the unit. The standby power light turned was on for a few seconds and then turned off. Now, there’s no response from the unit at all. When I turn it on, absolutely nothing happens. No sound of relays, nothing on the display, etc. Completely dead.Maybe I blew a fuse? Where should I begin looking for problems? A quick look inside the unit doesn’t show anything obviously wrong, but I’m also not sure exactly what to look for. EDIT: A bunch of photos of the insides. I also tried replacing the fuse on the power delivery board, no dice there. The original fuse is just fine as well. The whole thing:
Power Delivery Board:
Everything else:
Hi @Joseph Greve With the power connected to the receiver, in the power delivery board, check if there is +3.3VDC and/or +5.5VDC being supplied by the board with the fuse on it. Here’s a zoomed in image taken from the image you posted to show where I mean. In other Yamaha receivers, the +3.3V and the +5.5V DC are usually used to supply the board which has the CPU on it which controls the receiver. I can’t find a service manual or a schematic for your model, so hopefully yours will be similar.
(click on image to enlarge) Be safety aware when testing as there is lethal AC power on the board with the fuse on it.
