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Repair information for the Asus VivoBook Flip 14. Model numbers: TP412U/TP412UA/TP412FA. Released in 2018.

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Laptop doesn‘t power on unless plugged in

My laptop has this issue where it refuses to use the battery. When the adapter is connected, it runs completely fine, it detects and even charges the battery.

However, the moment I disconnect the adapter, the laptop just shuts off. In this state pressing the power button does nothing. Something weird I found, is that on battery power, while holding the power button, the laptop will actually power on and start booting, but the moment I let go, or once it triggers a reset (because I held the power button for 10sec) the screen goes black again.

I already replaced the battery (previous one had around 60% health, new one shows 99% health) but that didn‘t work. I also updated the bios and my OS with no luck either.

I would GREATLY appreciate any help, thanks )

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Hi @arno80605,

Just wondering that if the laptop doesn't work on the battery, why is it only at 99% and never reaches 100% if it charges and never discharges because it can't operate the laptop.

If you haven't already done so, try uninstalling the Microsoft ACPI-Compliant Control Method battery drivers in Device Manager and once they're uninstalled, close all open windows and then restart the laptop in the normal manner.

Upon restarting Windows will reinstall the battery drivers but this time they will be relevant for the new battery and not the original.

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Hello @jayeff,

With the 99% I meant the battery health as in it still has 99% of its original capacity, the battery actually reaches 100%.

Also I use Linux, not Windows, but this issue still persists in the BIOS.

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Since it is a new battery showing 99% and the computer otherwise works normally from the charger,

The power management IC it responsible for switching between charger and battery power.

A laptop will run from charger power first and switch over instantly if charger power is lost.

All of that circuitry is in the power circuit, which might be integral to the MB or a separate daughter board.

Based on this picture from this video, that circuit is on the MB around the battery connector (red white and black wires).

Block Image

Repairing that at a component level would be very difficult because u would have to first determine which component is at fault, then replace that on a very crowded SMD

circuit board. You can try to do that, replace the MB, or just continue to use it plugged in.

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I'm not sure if I it's worth it to get a new MB, its an oldish laptop. But thanks for your detailed answer, I will mark this as a solution.

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Sounds like something in the battery power circuitry isn't working properly. Even even it's charging the battery, it may not be able to use battery power to operate the system. It can detect the battery and charge it, but many times there is some kind of gate or component that merges power from the battery into the main power line. My guess is that's where the fault is.

I don't have schematics at hand for this specific model, but I would wager this is an issue with the board if you have already replaced the battery. It's possible the new one is a dud, but I am less likely to think so if the symptoms are exactly the same. Can you confirm the model of your laptop as well as if there are any part numbers or model numbers on the system board itself?

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My laptop is the Asus Vivobook Flip 14 (TP412FAC). The board also has TP412FAC MAIN BOARD R2.0 along with some Chinese letters. I don't know if this is relevant but it is made by Askpcb

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