ACER E5-571G-35YH (LA-B162P) B+ absent

Good morning forum.
I have a problem with this maniboard.
Notebook stay off, from adapter and Battery (not charging, led stay off) i open and check mainboard.
I checked on PQ302:
pin 1,2,3 19V
pin 4 0v ACDRV ABSENT)
pin 5,6,7,8 0v
PU301:
pin 1,2,3 0v
pin 4 0,20v with osccilation
pin 5 0v
pin 6 2,65v
pin 7,8,9,10 0v
pin 11 0,26v
pin 12,13 0,42v
pin 14,15 0v
pin 16 6v
pin 17 5,77v
pin 18,19 0,42v
pin 20 19,10v
my suspect is the dead charger since acdrv is not present.
Thank you

Replace PU301.

Measure resistance to ground on PR303.
Check PQ305, PQ306 if not shorted.
Also check PQ303.

very thank's. i check pr303 and have 1,7 ohm from ground
pq305 and pq306 are ok and pq303 are ok exect pin 5678 (linked to b+ are shorted)
I desolder pin 5,6,7,8 from pq303 and measure mosfet and is ok

iìve founded a short capactor linked to b+. I connect my power supply to b+ line and inject 1volt and founded a ceramic capacitor shorted. Very thank's guy's.
Now check rest of mainboard and charging process

i check pr303 and have 1,7 ohm from ground

Do the test described here on pr303:
post5699.html#p5699

Mainboard work very fine. Thank's