Surface Pro 4 X911788-008 - No boot

[nosfay]

Hi,
A friend bring me his Surface Pro 4 X911788-008, it won't boot at all.

It charges, battery is fine, cpu and ssd are heating when I press power (I can shutdown by pressing 15s power).

I've mesured voltage of all inductances after pressing power, everything is fine except 2 that are at 0v, I think they are used for iGPU.

There resistance is 2.5ohms.

I've found schematics and board view here , they are for i7 suface, mine is i5, but not so much difference.

0v coils are L6805 and L6806.

I've checked shorted mosfets near, it's fine (Q6811, Q6812, Q6813, Q6814).

What can I do next? Flash a new bios ?

Thanks for help

[nosfay]

Hello,
Just before the 2 coils L6805 and L6806, there is a 0 ohm resistor PR6815 that was dead. I've shunted it and the surface now boot
I wait the part to replace it.