So I got my hands on a broken RX560.

After measuring the basic resistances and voltages everything appears to be fine, the core itself also heats up and the pc boots up (beep is there, on igpu mode everything runs fine).
But I just do not get any display output. After looking and touching around a bit I recognized the VRM controller chip (ON NCP81022) and the corresponding low side MOSFETs for the Vcore (uPI M3098M) get very hot to the touch.

Now I dont have the time anymore to check for any short circuits by injecting voltage in the circuit and checking if anything...