Recently the Lonsdor K518ISE appeared a problem that will smoke after turn it on. It’s the same situation after repair it. it’s because customers use thier own power supply, not the power come with Lonsdor K518ISE.
In the board of K518 there is a capacitance to avoid that customer use other power, if use other power will burn out the capacitance, then this tool (Lonsdor K518ISE) will smoke.
The solution is remove the capacitance (if you want to use your own power supply), and this video is to tell you how to remove it.