Hi folks,
I am having a charge issue with a Acer TimelineX 4830TG-2434G75Mnbb laptop motherboard (LA-7321P rev1.0, model no P4LJ0).
The PC is booting and running OK on battery, but when I plug the AC adapter, I have no charge led and the battery does not charge (whether system on or off). Windows 10 shows the PC appears on battery mode.
I checked the charging port and the power rail through the DC-IN mosfets ; the 19.3V is available up to the B+ port. The gates of the 2 Mosfets is 25,2V.
I changed the original battery for a new battery ; charged at 11V.
Note: The JDOOR1 auxiliary board is connected to the motherboard with PWR ON set (battery active).
Somehow the BQ24725 (PU1) charging circuit looks inactive ; I noted the following voltages on the pins (AC adapter and battery connected, system off), which seem to comply with the standard application circuit
PIN1 1,2,3 : 19,34V
PIN4: 25,6V (ACDRV)
PIN5: 3,3V (ACOK)
PIN6: 2,7V (ACDET)
PIN7: 0V
PIN8,9: 3,3V (SMBUS)
PIN10: 0,8V (ILIM)
PIN11,12: 10,96V
PIN13: 11,01V
PIN14,15: 0V
PIN16: 5,99V
PIN17: 10,72V
PIN18: 10,93V
PIN19: 11,01V
PIN20: 19,05V
The battery driver mosfet is blocked (11V on one side, 19V on the other)
No sign of liquid damage or heated component in the area
Any idea what may be causing this issue and where to look ?
Thanks in advance for guidance.
I am having a charge issue with a Acer TimelineX 4830TG-2434G75Mnbb laptop motherboard (LA-7321P rev1.0, model no P4LJ0).
The PC is booting and running OK on battery, but when I plug the AC adapter, I have no charge led and the battery does not charge (whether system on or off). Windows 10 shows the PC appears on battery mode.
I checked the charging port and the power rail through the DC-IN mosfets ; the 19.3V is available up to the B+ port. The gates of the 2 Mosfets is 25,2V.
I changed the original battery for a new battery ; charged at 11V.
Note: The JDOOR1 auxiliary board is connected to the motherboard with PWR ON set (battery active).
Somehow the BQ24725 (PU1) charging circuit looks inactive ; I noted the following voltages on the pins (AC adapter and battery connected, system off), which seem to comply with the standard application circuit
PIN1 1,2,3 : 19,34V
PIN4: 25,6V (ACDRV)
PIN5: 3,3V (ACOK)
PIN6: 2,7V (ACDET)
PIN7: 0V
PIN8,9: 3,3V (SMBUS)
PIN10: 0,8V (ILIM)
PIN11,12: 10,96V
PIN13: 11,01V
PIN14,15: 0V
PIN16: 5,99V
PIN17: 10,72V
PIN18: 10,93V
PIN19: 11,01V
PIN20: 19,05V
The battery driver mosfet is blocked (11V on one side, 19V on the other)
No sign of liquid damage or heated component in the area
Any idea what may be causing this issue and where to look ?
Thanks in advance for guidance.
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