Asus Q304UA Not Charging Battery - Remains at 0%

[doesntmind]

Asus Q304UA
Symptoms:
Battery does not charge despite Windows showing battery charging. The battery does not charge above 0%. I replaced the battery to find that the laptop slowly discharged the new battery even though it was plugged in and displayed as charging in Windows.

I found a mosfet A5 GNA at the battery connector which reads 19V on top side and 800mv at the gate and battery connector side (see picture with red drawing). Is this normal?

[Techtiger]

Re: Asus Q304UA Not Charging Battery - Remains at 0%

Test the Coil and the 2 Mosfets 2 caps impedance with multimeter those might be connected to your battery connector
After test the coil 2 fets 2 caps and the battery connector all pins with battery in for Voltage 1 or 2 pins battery connector is GND , might be battery is completely dead or you have to check SIO battery pressent, I don't have the Schematic or the boardview

[doesntmind]

Re: Asus Q304UA Not Charging Battery - Remains at 0%

Here is my amateur schematic of that section. When A/C is plugged in, all three mosfets close and but two have 800mV on its gate and source and one has 800mV at drain and 0V on gate and source goes to ground. Will post again soon

[doesntmind]

Re: Asus Q304UA Not Charging Battery - Remains at 0%

Test the Coil and the 2 Mosfets 2 caps impedance with multimeter those might be connected to your battery connector
After test the coil 2 fets 2 caps and the battery connector all pins with battery in for Voltage 1 or 2 pins battery connector is GND , might be battery is completely dead or you have to check SIO battery pressent, I don't have the Schematic or the boardview

Inducter tested good.

3 Caps tested as:
Capacitance: 11.76 μF | ESR: .448 mΩ

2 E4 mosfets tested as:
Capacitance: 980 pF | Vt: 1.8 V

1 A5 mosfet tested as:
Capacitance: 2.43 nF | Vt: 2.1 V

I hope my readings at the points where components were removed may give a better clue as to whats the issue

[mcplslg123]

Re: Asus Q304UA Not Charging Battery - Remains at 0%

It seems your battery is either dead or completely discharges as 730mv reading is coming from battery output. Since you have tried a new battery and it was discharging actually so some fet is leaky and/or charger ic is likely to be defective. caps connected to battery output line should be fine since you got backup from new battery. Better to test those fet in diode mode and see if it shows shorting or near short reading between source and gate pins.

[doesntmind]

Re: Asus Q304UA Not Charging Battery - Remains at 0%

It seems your battery is either dead or completely discharges as 730mv reading is coming from battery output. Since you have tried a new battery and it was discharging actually so some fet is leaky and/or charger ic is likely to be defective. caps connected to battery output line should be fine since you got backup from new battery. Better to test those fet in diode mode and see if it shows shorting or near short reading between source and gate pins.

The 730mV is there when the battery is disconnected. Trying to find schematics for this board so I can get a better idea