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Lenovo DG721 nu porneste

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Buna seara! Va rog sa ma ajutati in problema cu acest leptop ,care nu porneste .  Baterie descarcata  , alimentatorul este bun verificat ,nu am niciun led de alimentare aprins.La masuratori nu am tensiune in punctele N1,N2 ,cred ca nu se deschid mosfeturile PQ311,312(. la masuratori nu sunt in scurt) pin 4 fara tensiune .PU 301 este alimentat pe pin28(20v),pin6 (12v ) pin 4(0v) Suspectez PU301 BQ24780S defect ,dar nu se incalzeste doar foarte putin . Va rog sa mi spuneti ce masuratori sa mai fac .Multumesc!

Lenovo IdeaPad 320-14IKB 320 DG421 DG521 DG721 NM-B242 UMA Schematic.pdf

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