Right off the bat : electronics repair is not my job, this is my first time poking about on a motherboard with a multimeter, and I'm unsure I'm measuring right. I have an Acer SF314-42 laptop whose battery won't charge, in windows (able to boot fine with power cable plugged) it says it's charging and battery at 0%. If I unplug the adapter (charge via USB-C), the laptop instantly turns off.

I've been able to find a schematic here which I've opened the laptop and checked the connector between the motherboard and the battery because I found a tutorial for an Acer laptop having the similar issue here though it's not the same model, it looks like a similar adapter. The guy in the video measures the voltage between every pin of the laptop and I tried to follow a similar diagnostic procedure.

I did that, and in the schematics linked above (which I've been able to view online with nextbv I see that the battery motherboard connector is called PJP2 and the pin all the way to the right is supposed to be 12.6 Volts, which I imagine is to be measured w.r.t. the ground. I suppose that if the motherboard works fine, I should be able to get 12.6 V reading when reading the tension between that pin and ground when the laptop is plugged in ?

In any case I tried to measure that and was getting the following (rather worrying) measurements, see the attached pictures and captions on google drive here.

What can I conclude from this ? Is the board toast and should I replace it ? Or is it the battery ?

Thanks !

⟐ Commented May 16, 2024 at 10:28 MST

⟐ Answer edited May 12, 2025 at 2:33 MST

⟐ Answered August 08, 2024 at 4:15 MST