Hi @juniorcabane
Use a DMM (digital multimeter) to check if there's 19V DC on the output plug of the charger. If you don't have a DMM then try using a another known working, compatible charger and check it works OK when charging the laptop.
If the charger is OK then here's the [https://www.youtube.com/watch?v=Uq5vqDRBwik|video] that shows how to open the laptop that may help.
At this stage all you need to do is to locate and unplug the [https://www.ebay.com.au/itm/225060323179|DC-In jack] cable (example only) from the motherboard and then use a DMM to check if there's 19V DC when measuring between the red and black wires on the cable plug, with the charger connected to the jack as per normal.
''If there is no voltage detected'' then the jack is faulty and it will need to be replaced as it cannot be repaired. Search online for ''Acer Aspire A114-31 DC-In jack'' to find suppliers that suit you best.
''If the correct voltage detected,'' then the [https://www.alisaler.com/?s=Quanta+ZAJ+Z8P+Z8PA|schematics] for the motherboard would be required to find out what's wrong.