Hello,
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 [link|https://drive.google.com/file/d/13CPxgVqsV97yvTnelcLGPQZwKVe-bwvK/view|schematic here|new_window=true] 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 [link|https://youtu.be/cbPLAr8K-6c?t=459|similar issue here|new_window=true] 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 [link|https://nextbv.app|nextbv|new_window=true] 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 [link|https://photos.app.goo.gl/dLW4aVd2PFPrCmK19|on google drive here|new_window=true].
What can I conclude from this ? Is the board toast and should I replace it ? Or is it the battery ?
Thanks !