Introduction
If the device will not turn on when twisting the earcup to on position, the switch leaver might be broken.
This guide requires small soldering, and preferably hot air soldering. DO AT OWN RISK.
The part i used is this one: https://www.farnell.com/datasheets/40139...
but there are many others like it.
Tools
Parts
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use a flathead 2 to Remove cap over the hinge, on the right side (same side as charging port)
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help with prytool to get it open
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opened
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Conclusion
To reassemble your device, follow these instructions in reverse order.