EEVblog #1087 - UNBELIEVABLE Alesis Studio Monitor Fault!

An unbelievable fault in Dave's Alesis M1 Active 520USB powered studio monitor speaker.
Can you discover the culprit before Dave does?
This was supposed to be a boring trivial repair of a power LED, but it turned into something much more interesting.
Teardown: https://www.youtube.com/watch?v=KsBVBtUDYx4

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