Hi,
Seems as though there may be a problem with the DC-In jack (supplier example only) on the laptop.
What can happens is that the centre +ve pin of the jack breaks internally and this opens the power supply path from the charger to the motherboard. Therefore the motherboard won't turn on when the power is connected and also the battery can't be charged to keep it running either. It keeps discharging until the laptop turns off.
To prove this you would need to access the jack on the motherboard and test both the +ve centre pin and -ve outer ring connector for continuity between the jack's input side and the red and black wires on the cable plug that is connected to the jack. (unplug the cable from the motherboard before testing so as to not get an incorrect measurement).
If the jack is faulty it cannot be repaired, it has to be replaced. Search online for Acer Nitro 5 AN517-51-56YW dc-in jack to find suppliers that suit you best.
Here's a video that will help you to gain access to the motherboard etc. Ensure that the battery is disconnected from the motherboard - you don't have to remove it, just disconnect it - before doing any other work inside the laptop, to avoid creating any electrical problems on the board. There is always power on a motherboard somewhere, even when the laptop is off. The power button is not a power isolating button.
@siksikaX
I think that you are mistaken.
Looking at the video I linked (if it is the one for your model) the DC-In jack in NOT connected to the battery.
Here's an image from the video that shows the DC-In jack and where it connects to the motherboard.
The battery is seen being disconnected at 1:14 minutes into the video and you can see that there is only the one connecting cable from the battery to the motherboard and that the DC-In jack cable is not connected to the battery.
(click on image)
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siksikaX have you check the AC adapter itself? Plug it in and since it has a simple barrel adapter use a voltmeter set on DC voltage. Red probe in the center hole of the barrel and Black probe on the outside. It should give you something like 19V on your meter. If not, you know it's the adapter.
par oldturkey03