laptop ideapad 3-15IML05 Laptop - Type 81WB

[mazloum]

Hi, I have this laptop ideapad 3-15IML05 Laptop - Type 81WB,
serial number: PF3DN87L
MTM: 81WB010DAX
board: GS452/GS552/GS752 NM-C781 Rev:1.0 2019-11-25
the problem is it powers up for10 seconds, no fans no picture then powers off, after few seconds it powers on by itself, also no display and then off, i found u4401 burnt , i removed it because i did not find it

3v and 5v are both present, 3.3v is present on bios, i reprogrammed bios with no success

[mcplslg123]

Resistance to GND on pin5/4/1 of U4401?

[mazloum]

Resistance to GND on pin5/4/1 of U4401?

pin5= 139 ohm
pin 4= 100 kohm
pin 1= 9 m ohm

[mcplslg123]

Pin5 resistance is too low-Should be in Kohms range.