hi there,
Please remove this post. The customer has requested their laptop back, and I was unable to locate the resistor needed for the repair...

i made a mistake, the board is actually x540ubr not x450ubr...
i massaged you check it plz
the measurement between gate/drain is 255k, same as source/drain
i will update you when i find a replacement for the mosfet and resistor.

Hey 👋
tnx for ur reply!


Source/drain 255k
Source/gate 6k
Gate/drain 255k

there is a 6kohm resistor connecting the source to gate, removed it and i now get almost 3.8Mohm
should the resistor i removed be a higher value?


Edit: checked the schematic, the risistor value should be 4.7Mohm!...

Hi this is my first topic, im new here and learning
Laptop model: x450ubr rev2
main issue: no power after 1st mosfet
After bypassing 1st mosfet laptop runs! Picture+fan even winfows boots up
but after a few minutes (2-3m) it shuts down.
things i noticed:
-charger led blinks 4 times and stops and repeats.
-No overheated components found everything seems normal.
-​​​ 19v 5v 3.3v are present and stable
the original charg ic have been replaced by someone (i think) new ic is bq780

thats all i could figure out, im stuck