Looks like a burned CPU. Replace it or buy a new laptop.
Then be sure to use it on a cooling pad and regularly use canned air to keep it clean, and most likely your new laptop will last a few years, especially if you buy a three year warranty.
My five year old Lenovo Thinkpad laptop used to shutdown for over-heating issue. Yesterday i gave for repairing and that man cleaned fan and applied thermal grease between processor and heat sink. After that it didn't improved and temperature used to increase randomly and shut down. Then i tried to do myself following experiments.
First: I applied toothpaste after removing earlier thermal paste and it also didn't worked out. Laptop was opening but shut down randomly with high temperature.
Second: I cleaned toothpaste with wet cloth and dried that place. Then insert a medicine packaging aluminium foil in that place and after that laptop isn't opening.
Finally i removed that packing material and started laptop but it isn't opening anymore. Please suggest what could have happened to laptop and how to solve.
Looking forward your reply. Thank you.