user28024: I have a spb 8266 board, an ESP-12E NodeMCU.
I broke my micro USB.
There's this piece of information but my case is unclear:
Can I use the micro usb's 5v to power the board through the VIN or do any solution require more equipment than that ?
(The board only has 3.3V and no 5V)

user61576: If you are working with the "v3" (Lolin) pcb, USB v5 pin is not directly connected to Vin, but to VU. Vin has a S4 SMD diode (aka Schottky 40V1A 1N5819) between it and the USB v5 pin.

user4143: 
Can I use the micro usb's 5v to power the board through the VIN or do any solution require more equipment than that ?

Yes. That is the pin's purpose.  You can use any voltage from about 4.5V up to 20V, although higher voltages will cause more heat from the on-board 3.3V regulator.
VIN just connects to the 5V of the USB.

28024: <p>I have a spb 8266 board, an ESP-12E NodeMCU.
I broke my micro USB.</p>

<p>There's <a href="http://henrysbench.capnfatz.com/henrys-bench/arduino-projects-tips-and-more/powering-the-esp-12e-nodemcu-development-board/" rel="noreferrer">this</a> piece of information but my case is unclear:</p>

<p>Can I use the micro usb's 5v to power the board through the VIN or do any solution require more equipment than that ?</p>

<p>(The board only has 3.3V and <strong>no</strong> 5V)</p>
 61576: <p>If you are working with the "v3" (Lolin) pcb, USB v5 pin is not directly connected to Vin, but to VU. Vin has a S4 SMD diode (aka Schottky 40V1A 1N5819) between it and the USB v5 pin.</p>
 4143: <blockquote>
  <p>Can I use the micro usb's 5v to power the board through the VIN or do any solution require more equipment than that ?</p>
</blockquote>

<p>Yes. That is the pin's purpose.  You can use any voltage from about 4.5V up to 20V, although higher voltages will cause more heat from the on-board 3.3V regulator.</p>

<p>VIN just connects to the 5V of the USB.</p>
