The XYZ da Vinci 3D printer is not the best 3D printer you can get, especially in 2020. However, if you are following this tutorial you are probably stuck with one and need to fix it.
I know it can be frustrating, and that usually 3D printers tend to breakdown when we need them the most. But don't worry this problem is very easy to solve, you just need to have some soldering skills.

By the way, even if your extruder is still working fine you might consider doing this simple upgrade to prevent any future damage to it.

Supplies

Screwdriver

Multimeter (or Voltmeter)

Soldering iron

Some Solder (60/40 preferable)

Clipper

Copper wire (~1mm thick)

4A DC fuse (or anything close to it, I am using a 5A fuse)

Fuse holder

Step 1: Knowing the Cause of the Problem

In my case, a thermistor on the motherboard of the printer was grilled, and it probably grilled due to a short-circuit that happened at the extruder while I was cleaning it with a metal brush. (Yea dumb idea, don't try this at home)

Nevertheless, to make sure that this is the case with your printer while being in the "filament installation process", (or any process that requires the extruder to heat up) measure the voltage at the extruder connector pins, if you see no voltage, then try to measure the voltage between the right pin of the connector and the upper pad of the R271 thermistor (located directly above the left pin of the extruder connector). If you see a voltage now then you, unfortunately, have the same problem as me. (or maybe, fortunately, because you will be able to repair it very soon).

Step 2: Removing / Replacing the Thermistor

DISCLAIMER: First of all, before we start, I am going to simply remove the thermistor and not replace it! That's because the thermistor only serves for temperature control purposes, and is not that important. I don't know the specs of the thermistor, and didn't want to bother doing some research to find it's specs. If you decide to replace it, try to do your research, and if you find it's specs share it in the comments so others could benefit from you, thank you :)

Now, if you wish to replace or remove it, first start by TURNING OFF your printer, then unscrew the backplate of the printer. (Which should be already removed if you conducted the tests in step 1)

With your soldering iron remove the thermistor and short it's pads together using a copper wire and solder (or replace the thermistor if you wish)

Step 3: Prevent Future Damage

Whether your thermistor is grilled or not, and even if you decide to replace the thermistor, I would recommend doing this step to prevent any future damage to the printer.

Remove the extruder connector, pick one of its wires and cut it in half. Solder in between the two ends of the wire your fuse connector and insert your fuse.

Insert the connector in place and your printer should now work like a charm while being protected from short circuits. And next time, when a short happens, simply replace the broken fuse.

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Thank you for your time,

I hope this video helped you,

Yours truly,

Guy Maalouf