Neumann KH120 studio monitor power supply repair

Hi everybody I am trying to rescue a dead Neumann KH120 studio monitor that likely suffered from a power surge. The SMPS has blown up and it is proving very difficult to repair it. My first findings were disintegrated mains fuse and shorted switching mosfet. also one of the diode rectifiers on the transformer secondary was short circuit. I have replaced the mosfet and the diodes, and also the pwm controller ic. I have checked all diodes, resistors and capacitors and also the opto... Read more