I stupidly changed the AV receiver to my system with the subwoofer still powered up and active. When I unplugged the sub phono it made a loud rumble noise and then completely stopped working. I checked the power on the kettle plug and the fuse on the back of the sub. All ok.
I have removed the back plate with electronics and confirmed power to the first circuit board.
Any steer you advice on how to fault find and repair would be much appreciated?
Thnaks