I am not a pro, and I am just saying.Okay, I had an RedMI 1S a year ago, and as like any cheap phone, it used to overheat like up to 70 degrees [Celsius]. So, I couldn't multitask, and if I used data, my SIM slot heated up like a lot, felt that the SIM would burn up or something.
Regarding your problem, I guess the problem is the battery, try going to a local phone shop and try replacing the battery, or else if you still have your warranty on, replace the whole phone.
If not, your phone is screwed. It will not function, try buying a better phone like the OnePlus 3 or 3T, cause this phone really is horrible, random shutdowns and overheating, its miserable.
I highly do not recommend you to buy this phone.
I'm sorry about your phone, I guess its time. This only way to fry the CPU or short-circuit is possibly, if you poured water on the phone

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My MI died as it overheated tooooooooooo badly, and voila. The screen began turning black. All the features of the phone works except the screen or display.
So, in all, replace your 1S battery, and if that doesn't work, buy a 3T.
Good Luck.
(Current phone of mine is - iPhone 5C)
I repeat I am not a pro, I am just saying through the experience I got.
