My A53 is not functioning at all. If I charge it, it kind of turns on but there is nothing on the screen. I don't think the screen is the problem. I am pretty sure, its the motherboard that has faulted. I would like to buy a replacement motherboard of Samsung A53 phone. How and where can I buy it?
You should still have a warranty on the device so I would suggest you take it back to Samsung. Motherboards aren't cheap and they need to be written with your serial/imei number unless you plan on buying a second hand device and using the motherboard from there.
Another issue is, I had bought the phone in Middle-East. Though, they mention "Global Warranty" or whatever to that tune, I have heard that Samsung don't really honour it and not very supportive.
