Reddit reviews 3M 41.9mm-25.4mm-25-8810 Thermally Conductive Adhesive Transfer Tape 8810, 1.65" Wide, 0.028 yd. Length, White (Pack of 25)
We found 1 Reddit comments about 3M 41.9mm-25.4mm-25-8810 Thermally Conductive Adhesive Transfer Tape 8810, 1.65" Wide, 0.028 yd. Length, White (Pack of 25). Here are the top ones, ranked by their Reddit score.
Used for creating a heat transfer path between heat generating components and heat sinks or other cooling devicesHigh mechanical strengthImproved surface wet-out for rough surface/LSE substrates
It sounds like your PMA8084 Power Management IC has been killed. It's really close to the SoC so all that heat probably did it in. It's a common issue, maybe you could find someone to replace it for you. Process looks like this https://www.youtube.com/watch?v=lMmMoyNrxdo
You can buy the IC here: https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=Pma8084+Power+Management&_sacat=0
You probably don't have the tools or skill to do it yourself, you'll have to find someone local or online to send it to.
​
Good luck, depends how important those files were to you if this is worth it. Sorry to bring you bad news. Let me know if you do fix it or the problem was actually something else, always a learning experience.
​
You should also open up the phone and place new thermal pads were the old ones were. The thickness of new pads squeezes the SoC against the PCB and usually keeps it working for some time longer if the solder has degraded from overheating. The thermal pad also prevents it from ever overheating again. The thermal pads Samsung put in from factory are absolute garbage, and are what cause the SoC to cook itself alive, or "eMMC errors". Do not put cardboard in your phone against the 100 Celsius surface of the SoC like some people are going around suggesting. I recommend these thermal pads. Any pressure from placing cardboard will also be there with good quality thermal pads.