Today I recieved a Jamo A101 subwoofer.
The problem was it did not work at all. The switched power supply did not start oscillating. After measuring I noticed the feedback optocoupler was not switching. After checking some caps I finally found a defective Schottky diode. This one was fully shorted.
See backside of PCB here below. I have marked de culpritt diode in red. It is a SS16 diode. After replacing it, the subwoofer works well again.
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