I am very new and don't really know if i'm posting in the right place, but this component comes from a power supply so... I'll post it here.
My first thought was that it is a transistor, but it is completely blank with no writing so i'm asking for some advice... I'm a complete noob so...

 

No way to identify it unfortunately.

What power supply is it from?

A schematic may be available.

 

No way to identify it unfortunately.

What power supply is it from?

A schematic may be available.

It is some old made in china 12 to 24V 100W power supply bought from one of those cheap stores... It doesn't even have a brand.... Well... I guess it's useless then.... Thanks for the answer!

 

Trace the circuit around the defective device and post a schematic. If we can't guess at what it is, we'll ask for more of the circuit until we can.

 

Post pictures of the pcb both sides...

 

Here goes the photo... Not really at high levels with drawing schematics, told you, I'm a noob and this thing is complicated

 

I'm not really hoping to get it back working again, there were a couple of components completely blown and here in italy finding electronic components is near to impossible. Just was curious about that element i showed in the first photo.

 

What you have there is a switchmode psu, can you show where the item is located on the pcb, chances are its a mosfet or dual diode.