Introduction
The Dyson V8 powers accessories through two pins in the motor unit. If there is no power on these pins when the motor is working, it's likely a fault on the motherboard.
The following video shows how to replace the MOSFET on the motherboard. Alternatively, if soldering is not an option, it's also possible to buy the motor block including the motherboard from e.g. Aliexpress.
Tools
Parts
Conclusion
To reassemble your device, follow these instructions in reverse order.
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