user8754: I've recently bought an Arduino Pro Mini, the 3.3V and 8MHz version. The first time I powered it, using the VCC pin, all worked. But, as soon as I attempt using the RAW pin instead, nothing lights up... Is my regulator broken ? Or is this a typical issue ?

user4143: I am not completely familiar with that specific board, but according to the schematic there is a solder jumper which is used to isolate the RAW voltage regulator from the rest of the system "for low power applications".

I don't know off hand if that comes pre-soldered or not, but check it to make sure it is connected, otherwise the RAW input will do nothing.

8754: <p>I've recently bought an Arduino Pro Mini, the 3.3V and 8MHz version. The first time I powered it, using the VCC pin, all worked. But, as soon as I attempt using the RAW pin instead, nothing lights up... Is my regulator broken ? Or is this a typical issue ?</p>
 4143: <p>I am not completely familiar with that specific board, but according to the schematic there is a solder jumper which is used to isolate the RAW voltage regulator from the rest of the system "for low power applications".</p>

<p><img src="https://i.stack.imgur.com/qoVld.png" alt="enter image description here"></p>

<p>I don't know off hand if that comes pre-soldered or not, but check it to make sure it is connected, otherwise the RAW input will do nothing.</p>
