I'm back for some help.
Checked the board after desoldering the allegedly faulty component, and saw that only one of the two internal load switches is used.
Measuring i get 5v at Vin and 0.9V at Vout (without the IC, of course), enable signal 3.3V
Is that possible? Or is something shorted also on the load side?...

It matches indeed! Thank you very much!

Hi all,
I'm trying to fix this NUC, whose sata power cable was somehow shorted (not yet clear).
Standby light comes on when dc jack is inserted, but when power button is pressed this component becomes very hot and nothing more happens.
It's located near the corner of the motherboard close to the ram socket and behind the power button.
Close to it there's an ITE it8566vg (unknown) and a load switch DML3009LDC.

So what is this JWFN 1rD9B ?
Thanks in advance....