Acdrv not genarating

[RATIM SIDDIQUE]

Lenovo fs44a&fs54a nm-c171 rev:1.0 board
charging ic bg24780s
Dc in-19v
Regn-6v
Acdetect-2.8v
Acok low
No volt in acdrv pin
laptop running fine with battery
no power without battery
help me plz

[mon2]

Remove all power. Meter in resistance mode.

Measure the resistance across the DC-in mosfets (full details in the sticky above by @Piernov).

Measure:

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8)

Post each measurement of each DCin mosfet. If ACDRV is low, the fault is likely a defective mosfet which is being driven by this charger pin. In series with ACDRV is often a ~4k ohm resistor. You can flux and carefully remove this resistor. Do not lose the part.

Then power up again to check if ACDRV is ~25v without this resistor driving the mosfets. Best to check the resistance without power on the same mosfets.

[RATIM SIDDIQUE]

Thank u so much
pq202 was faulty
I repalaced it,now working fine
Again thanks for your advice