I burned something down while connecting fans

[ari93]

Hello Guys,

Today i tryed to install 3 fans (1x for Board / 1x PSU / 1x for extra cooling of extruder).

While i plugged them in nothign strange happend.

As soon i turned on the power i could smell a bit of burnt plastic.
As you can see on the pictures something burnt down.

Printer is still working fine so i am just wondering what just happend there ?

I posted a picture here :
https://imgur.com/a/8vPLG

Would be nice if something can help me out there

[William]

I think you should replace it with a new mainboard
It seems not safe at now.
I think the issue lead by the wirings of fans Short-circuit.