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Boot Up Problem/Mystery


When I turn on the unit, the logic controller ( ItsyBitsy 32u4 - 3V ) does not boot up.It boots up just fine when I connect the USB, then runs properly even when the USB is disconnected!!!

Yes, I checked the 3V rail and it is rock stable.

Here is a screenshot of the schematic.

Does anyone have any clue what is causing the problem?

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