Schematics DELL XPS 15 7590 - EDP51 EDB51 LA-H331P REV1.0

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DELL XPS 15 7590 - EDP51 EDB51 LA-H331P REV1.0.pdf
Schematics

 

[vinapt]

So can try another BIOS then check the hardware

Already did.
As i stated before... if i use the bios from post #130, the computer powers on, but only the GPU fan is working.
I've tried the CPU fan, in the GPU fan connector, and it rotates....and also tried GPU fan in CPU connector and it does not rotate.