IS THAT TRUE? dynabook no power .

[mo000]

hi
i have dynabokk c50-g-102 i5 10th gen
IP3_CN16S_MB_V20_202001229B
the laptop die no power no charging led no nothing
i can't find schematic or boardview
no short on motherboard
19v stop on source of pq2 drain=0v
on the gate of pq1 and pq2 =18.5v qnd source 19v but pq1 and pq2 qre pchannel which is means the source voltage should be lower
what i know is gate of pq1 and pq2 controlled by charger ic here is bq24780s but vcc of bq=0v which means ther is somthing else controlling mosfet gate
i think kbc IT8987E is controll the gates of both mosfet becasue the gate of pq1 and pq2 connected to resistor and 3pin transistor and resistor and directly to pin 80 of kbc .
is that true ? or this circuit for a protection .
the kbc is faulty because 3.3 vcc kbc is shorted if i inject 1v the kbc heat quickly .

[davidebeatrici]

Sorin from Electronics Repair School (YouTube channel) has fixed quite a few of these models, almost all with MOSFET related issues. I, myself, have fixed a Satellite Pro C50-H-11J that was not charging the battery anymore due to PQ4 being shorted.



You mentioned the EC chip heats up quickly, have you checked whether one of its outputs is shorted?

[mo000]

any idea ?

[davidebeatrici]

Sorin from Electronics Repair School (YouTube channel) has fixed quite a few of these models, almost all with MOSFET related issues. I, myself, have fixed a Satellite Pro C50-H-11J that was not charging the battery anymore due to PQ4 being shorted.



You mentioned the EC chip heats up quickly, have you checked whether one of its outputs is shorted?

[mo000]

[QUOTE=davidebeatrici;n3714531]Sorin from Electronics Repair School (YouTube channel) has fixed quite a few of these models, almost all with MOSFET related issues. I, myself, have fixed a Satellite Pro C50-H-11J that was not charging the battery anymore due to PQ4 being shorted.



You mentioned the EC chip heats up quickly, have you checked whether one of its outputs is shorted?[/QUOTE
unfortunately not the same design
i found the ec is shorted 3.3v vcc input shorted .
i don't know if i have to program the new ec chip and i cant found ec dump for this laptop .