Acer Swift SF314-42 Battery not Charging

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Acer Swift 3 SF314-42

Acer Swift SF314-42 laptop range, models including N19C4, there are other models. Depending on model it'll come with AMD CPU and Radeon graphics or Intel and NVDIA.

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Gordon Freeman @gordonfree22038

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Acer Swift SF314-42 Battery not Charging

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 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 !

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Moth @computermoth 평판: 137 3 1 · Answer 1 · 2024-05-16T08:34:32-07:00

Moth @computermoth

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I have yet to fully understand voltage and such with computers (I understand none of it, and quite honestly, it's an alien language to me). But I commonly see issues like this.

This may be that the battery has gone and decided that it wants to be a paperweight now, basically, it's dead, dead dead.

Usually I test this by removing the battery and seeing how the computer responds if I try plugging in a battery from another device. (Helps when one has dozens of the same model for spare parts.)

If the other battery holds a charge? Great! It's the battery. If it's the same issue? Well then, the chances of this spare battery going from fully functioning to paperweight in 5 minutes is unlikely.

Another thing you may be able to try, not all computers can do this. Unplug the battery and remove it, plug in the charger. Does it turn on? Or does the computer remain an expensive paperweight? If it does turn on, see if you can go and find the battery settings and such. If you do, it's probably freaking out, I've had it display anything from '250% charged' to '0%' and 'N/A'.

This should be able to at least rule out, the charging port works. This narrows it down to your battery and the area on the motherboard that is around the battery.

Sadly this is all I can suggest, good luck.

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Don't worry, nobody understands voltage, those that claim they do are just pretending.

Hey, thanks for your input, so I tried unplugging the battery and starting up the laptop while connected, it starts up just fine, the battery icon on the windows lock screen has an arrow on it, and once unlocked, if I go to settings there is not battery menu, it's as if it was a desktop computer. Best,

Gordon Freeman 의 2024년 5월 16일

@gordonfree22038 - That's pretty much just the computer freaking out. It turns on, realizes that that part isn't connected, and therefor, in it's mind, that part doesn't exist. So, bye bye to the battery menu, no use for something that doesn't exist.

Best suggestion is looking into trying to replace the battery, or even better, if you have a battery for that model that you know works, try connecting it and see what happens. You can even just connect the battery, see what happens, and then put the battery back in the other working device.

In the meantime, your computer is basically on life support. It will work plugged in, but the instant it is unplugged for even a millisecond, it will turn off. Not exactly ideal, but it does work for the short term. And no, it should not damage your computer if you do this.

Moth 의 2024년 5월 16일

Heya @Moth, I get that the thing is that I'd like to figure out if the board is faulty instead of the battery based on the readings and schematics above as I don't have a spare battery lying about for that laptop, Best

Gordon Freeman 의 2024년 5월 16일

@gordonfree22038 - Unfortunately I don't have that knowledge to help with that, but I do so happen to be in the same room as someone that does have that kind of knowledge, to which I shall consult them and see if they can tell you what I can't about your readings.

Moth 의 2024년 5월 16일

Heya @Moth

That's very sweet, thank you :)

If you need extra measurements, ask away

Gordon Freeman 의 2024년 5월 16일

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