Model : Dell Vostro 15 3568
Mother Board : VEGAS/TURIS SKL/KBL 15341-1

First, laptop came with 19V line short. I found the shorted fet (PU4504). Replace with good one and 19V line short is gone. After that i found 3.3V line is shorted too. So i try to inject 3.3V with 1Amp setting in 5Amp DC Power Supply. But nothing hot. I try to increase Amp and at about 5Amp CPU is hot. Is that CPU short?

CPU replacement

How can i test CPU is really short or not without replacing CPU.