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Power measurement with external power supply

Hello everyone,

I am trying to measure the current being consumed by nrf52840 using an external power supply.

Setup: I have connected 3.3V DC power supply to connector P21 and switch 10 is in ON position and switch 9 is in VDD position. As specified in the picture below. 

However, the board is not running with this setup.

As mentioned in the second screenshot, supply VDD domain from a different source, I tried connecting USB to power the remaining board. But it does not work.

Kindly help me understand how I can power the rest of the board? If I have to power the rest of the board with USB what extra changes do I have to make on the board?

Regards,

Sameer 

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