I wrote this in a comment but i think an answer is better If it’s overheating and doesn’t turn on it could be the heat cause the ic solder joints to weaken/melt such as cpu. I heard the only possible solution to this is to go to a microsolderist that specializes in reballing as long as the soc(cpu) and emmc chip isn’t damaged it could work. There are quick fix suggestions that could work like smacking or massaging or in more extreme measures like freezer (has to be really protected and covered) or oven method but that’s too dangerous and wouldn’t recommend at all If those quick fixes do work but only temporarily then like I said before the solder joints or other components are most likely loose and you may need to see a mircosoldering expert that specializes on androids to fix those loose solder connections. Hope that helps
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