ACER e1-531 not charging .

[mo000]

hi everyone
the laptop comes to me with water damage
i clean it and i fix the shorted (the short not in charging circuit) .
the laptop works fine with battery and with charger
but when i plug in the power supply to charge the battery the voltage becomes 16 v with high amps 5A and mosfet PQ9 becomes very hot

i change the PQ9 PQ11 and charger ic BQ25A and PR52 and pq12 pq13 witout any change .

[mon2]

Re: ACER e1-531 not charging .

Remove all power. Meter in resistance mode (2k).

Check resistance of:

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

for each mosfet. Low readings are of concern.

Which exact mosfet was used for PQ9 ?

[mo000]

Re: ACER e1-531 not charging .

Remove all power. Meter in resistance mode (2k).

Check resistance of:

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

for each mosfet. Low readings are of concern.

Which exact mosfet was used for PQ9 ?

PQ9 (S-D) 0 ohm (S-G) 5 ohms (G-D) 5 ohms
PQ10 (S-D) 0 ohm (S-G) 5 ohms (G-D) 0 ohms
PQ11 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms
PQ12 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms
PQ13 (S-D) 0 ohm (S-G) 0 ohms (G-D) 0 ohms

PQ9 mosfet AO4496

[mon2]

Re: ACER e1-531 not charging .

Wow. From the posted resistance values, each mosfet appears to be defective.

Try the following:

a) remove PQ9 off the logic board. Then measure the resistance again for the removed mosfet. Are the readings much different of the removed component ?

b) with PQ9 removed - check the resistance of the PCB pads where PQ9 was soldered.

Post the values of PQ9 (when it is not on the board) & PCB pads with PQ9 removed.

Do not power up the logic board.

c) Did you replace only PQ9 with the AO4496 ? No other mosfet has been replaced ?

[mo000]

Re: ACER e1-531 not charging .

Wow. From the posted resistance values, each mosfet appears to be defective.

Try the following:

a) remove PQ9 off the logic board. Then measure the resistance again for the removed mosfet. Are the readings much different of the removed component ?

b) with PQ9 removed - check the resistance of the PCB pads where PQ9 was soldered.

Post the values of PQ9 (when it is not on the board) & PCB pads with PQ9 removed.

Do not power up the logic board.

c) Did you replace only PQ9 with the AO4496 ? No other mosfet has been replaced ?

the problem solved
i replace pq9 and pq10 with AO4456
the laptop charging fine
thank you for help .