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What effect would shorting a Vin+ pin to GND have? Assuming no DC power has been fed and the board is not connected to power. Would damage the board or has no effect?

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    \$\begingroup\$ What happens when you hit the gas pedal and the break pedal at the same time in a car that's not running? That's right, it starts flying. The future is now, put on your seat belt. \$\endgroup\$ – Harry Svensson Jul 26 '17 at 2:17
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If the board is not powered, there should be no effect. There will be a short but there will be no (significant) current flowing.

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It should cause no problem if the power is not applied. However, if you do this with the power applied, then the low resistance path may cause a large current to flow from Vcc to GND, damaging both pins if no protection is provided.

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Nothing happens cause you don't have any power applied to the board. If you would have a powered up board and short 5V and GND for a short period of time probably nothing would happen. The consumer Developmentboards are wery resistant and have security features to prevent serious damage.

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