I have an HP Probook 445 G7 and the standard AC adapter is not charging the laptop. When I plug it into the laptop, the white battery light blinks 8 1/2 times and then goes off. The charging indicator in Windows 10 does not show the laptop as charging or even as being plugged in. I am trying to determine what the root cause of this issue is. Here is what I have tried:
I have tried uninstalling the "Microsoft ACPI-Compliant Control Method Battery" in Windows Device Manager. This made no change.
I have tried unplugging the AC adapter, removing the battery, and holding down the power button for 30 seconds, then reinstalling the battery and plugging the laptop back in and I still get the 8 1/2 blinks. The laptop will boot up but it is running off the battery.
I have tried uninstalling the battery and trying to power up the laptop with just the standard AC adapter (and no battery). This results in the battery light, caps lock light, and power button flashing repeatedly, but the laptop will not boot up without the battery.
I have measured the voltage from the barrel connector for the standard AC adapter using a multimeter. It reads the correct 19.5V. I have also measured the voltage from the pigtail coming off the charging port inside the laptop, it also reads 19.5V.
I also own a USB-C charger for the laptop, this still charges the battery normally, and the laptop functions completely correctly when using the USB-C charger. I've also run the battery self-check under F2 when booting up and the battery passes as okay.
What could be causing the issues with the standard AC adapter? Is it bad? Is the charging port bad? Is it a mainboard problem? Given that the USB-C charger is still working fine, I'm assuming the battery and mainboard are okay. This would lead me to believe it is a charging port or standard AC adapter issue. Is is possible the standard AC adapter could be bad even though it still shows 19.5V on the multimeter? Is is possible the charging port is bad despite that it still passes 19.5V through it? Please let me know the next best course of action.