hello hello

i have one for onlock.
Latitude 5420, 8FC8, ST: 301H1F3, mobo: LA-K491P...

Heh thank you for help.
It was bad PQ8211 - was shorted in all ways

Funny - i have searched for problems on mosfets near battery

MANY THANKS !!!


btw because gpu still makes problems - i have found another problematic mosfet PQA406 on DGFXCORE

Now looks all fine i mean

Hello,

sorry for deelay.
I have tested battery on another lenovo. Battery was charged to 80% soo looks good.

Here are results - tested on usbc charger and on square lenovo charger too - both original.

On BQ:

ACDET : 3,7V
ACOK : 2,8V
REGN : 6V
ACDRV : 20,2V

On BATT Conn:

M_BAT_IN : 16,4V (battery is charged to approx 80%)
I2C_CLK : 3,3V
I2C_DATA : 3,3V
M_TEMP : 2V

ON DCIN with square charger :

DCIN : 20,5V
ACDC_ID : 1,9V
...and led is not...

Hello,

Please i need help from you how to check what is bad on this device.
Laptop turns on normally on charger or on precharged battery, but is unable to charge - in system shows charging but not charging.

Originally was blown dual mosfet near gpu.

EDIT - after few mins on charger windows says 100% chaged with exclamation mark and something like "please check charger"

Charger is new original 100Watt

Motherboard LPM-3 MB 19770-1
Charging is BQ24780s
Schematics here : https://www.badcaps.net/filedata/f...