Acer Nitro 5 Broken 3rd party AC adapter's charging pin gets exremely hot

Looks like you are not using the correct adapter plug barrel and pin diameter. Tell us what your full laptop model is and adapter model, include voltage and Watt of the adapter. You will likely burn the DC jack of your laptop if you continue using that bad adapter plug and that will require a trip to Acer Services to install a new DC jack or far worse a new motherboard. I recommend you stop using your laptop till you have corrected the bad adapter plug contact. Type @Puraw at the top of your reply so I will get an alert.

That's where I bought my laptop 4 years ago, are you also from the Philippines?

I need the OD and ID of the barrel and pin in mm, can you measure that with a small (cheap plastic) caliper (DIY shop), I know the pin is yellow.

This is a good one from Lazada (2 days delivery) P2,000.

The pin is blue but that's OK, the size is 5.5mm (outside) x 1.7mm (inside the pin) looks OK to me but check the OD with a good ruler if the diameter of your adapter plug (pin end) is 5.5mm (approximately).

https://www.lazada.com.ph/products/acer-laptop-charger-19v-711a71a-135w-for-acer-nitro-5-an515-54-an517-51-n18c4-an515-55-53ag-an515-44-r99q-an515-55-52kw-n18c3-an515-51-an515-41-an515-53-an515-52-an515-43-laptop-adapter-power-supply-cord-i1694132939.html

Magic, I am a magician😀(you posted a picture)

The 2mm inner is close enough but the 4mm is that really the outside of the metal barrel could that be 5.5mm perhaps? check also the DC jack of the laptop what is the inside of the hole, maybe your plug is not for this model or worn out. If you think that 5.5mm will fit in the DC jack you should go ahead, wish you had a caliper tool to measure the inside of the DC jack. See if you can find a bolt that fits snugly in the DC jack and then measure if the bolt is 5.5mm. Type my name on top of your reply @Puraw I cannot open every post.

Here is the same adapter by Shopee even your full laptop model number is mentioned, give them a call or chat and ask what the outside diameter of the metal plug pin (called barrel) is in mm, if they say 5.5mm you are safe. I checked all possible plugs it is either 5.5mm or 3.3mm, there is no 4mm, check again either the barrel of your plug is worn out or it is a wrong adapter for your model.

https://shopee.ph/Charger-compatible-with-Acer-Nitro-5-AN515-43-R3TY-ADP-135KB-T-19V-7.11A-i.25946513.6419582914

Acer laptops are very popular here, I would say 1/1,000 maybe. You want a good caliper, if you see a (small) stainless steel one buy it but make sure it has both mm and inches.

Same one only a blue tip instead of yellow and a good deal, go for it.

It started off as a US convention for compatible pins and laptop DC jacks, but like everything else in the tech industry it quickly lost its meaning since the Chinese are making these adapters.

Last month you wrote you were going to look for a small caliper tool at a DIY shop, did you get one? That new adapter should have an OD (the metal barrel tip) of 5.5 millimeters, check with the caliper that as there are also 3.3mm barrels and then you should return the adapter to Shopee (and ask for a refund). Note that some Shopee partners are careless with plug sizes.

Put @Puraw on your reply or I won't see it.