Sansei nb156 ( sf40kb rev: 1.0 ) wont boot properly

[SoporteNetFe]

Laptop: SANSEI NB156 ( Intel Core i5-7200U )

Board: SF40KB REV: 1.0

BIOS: 1.02.02.DTH

Problem: Only with battery power supply, when press power button, laptop boot, show brand logo and shutdown. Always.

With charger attached, first press power button, same results, but second, boot correctly and all works fine. Can disconnect the charger, reboot Windows, close the lid.

If power off the laptop, need connect the charger and in the second boot, works again.

Maybe BIOS/EC problem? BIOS dump attached.

Thanks!

[Stevedb]

I would look to check first dcin mosfets and surrounding on charging circuit , charging ic . If you got required voltages before messing with bios