hello all, i have this old laptop c640 and the problem is VTT, VCORE voltage blinking, led ac (plug logo) ok, but led (power logo) blinking. 5 and 3v are present. what shoud i check? any help appreciated. thank you.
I have same problem
Replaced charger ic but mosfet voltage goes 3v-8v, LDO 1.6v then 0v, AC detect is ok it show 1.66v but this laptop can run with battery
Maybe bad ic connection, i see it not fully filled with tin
And DLO pin show OL when resistance mode and 0v when plug a charger
I will resolder it again
After resolder charger led on but no charger voltage from inductor (low side charging mosfet gate 0v, resistance 23Mohm and high side charging mosfet gate only 10.43v, resistance 30Mohm and my battery voltage is 10.96v = 0%) also LDO 5.25v but after resistor R6007 only 0.24V
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