Laptop suddenly shutdown after 1 minute I need help

Hi, I have a problem with a dell vostro 1520 laptop. When it turns on and 1-2 minutes pass, it suddenly turns off. I thought it was overheating, so I changed the thermal paste, but it's still the same, i thougt its battery and i replaced it but its same and when the charger is plugged laptop only turn on when battery is IN laptop and i reset bios through motherboard battery and still same. if someone have any solution i will try