MSI GT75 MS-17A31 no cpu/gpu power

[BalkanBoy]

Hi friends,

I got msi laptop with all voltages present except on cpu/gpu coils.
So far I changed realtek audio controller which was shorted, EC was bad too, I replaced it and reprogrammed, flashed bios. Result is that power led comes on for about 15-20 seconds, whole board has power including PCH but CPU/GPU doesn't get power. Gpu is mxm, it's removable, without it everything is same. CPU doesn't look shorted, I injected 0.8V on every coil, didn't draw abnormaly high current.

My question is what signals should I trace exactly on PWM controller or some place else, where to start diagnosing?

Thanks

[BalkanBoy]

Re: MSI GT75 MS-17A31 no cpu/gpu power

I got another question since I repaired CPU circuit.

Now laptop is powering on but there's no marketing name in bios, it says "please change product name". Issue is that Steelseries engine doesn't recognize keyboard, lights doesn't work and some keys doesn't work either. Could be EC related, I can try to change another EC but not sure how keyboard lights should work at all as there is no keyboard light connector on motherboard. Any ideas?