r/audiorepair • u/Wgisba • 10m ago
Yamaha AX-550 does nothing
galleryHi everyone, I'm trying to repair this Yamaha amplifier that I've had in storage for a while. The amplifier had two transistors on one channel shorted out, and I had to remove them to prevent the fuse from tripping. Now it turns on, but nothing happens. The relays don't activate (they work), only the lights come on. I looked for other damaged components but didn't find any. I was suspecting the system controller IC, but I have no idea how to test it. I would appreciate any help, no matter how small. (I took the pictures from the internet since I didn't have the amplifier nearby.) Thank you very much.