Dell ins 15-3521 no display(300mA in DC supply)

[parthabose]

I checked dell ins 15-3521(LA-9104p) as it was turning on but no display was present.
With RAM installed, DC supply was showing 300mA only. Battery port volt
was ok. BIOS volt was ok. RAM volt was .75v, Vcore of processor was missing.
Then I changed RAM power IC 5616A(PU300) & DC supply was then showing 900mA.
RAM volt became 1.5v, Processor vcore became .9v, Display came.