原帖由： Minho ,
As Jake suggests, this phone may have been contaminated with water. The easily accessible indicators can be found [https://support.apple.com/en-us/HT204104|here]. There are also some LDI’s on the logic board. The fact that the phone was smashed is also problematic. All of the symptoms you state are caused by excessive heat internally. The problem could be modular in nature or it could be at the board level. You could try to disconnect one module at a time (camera, sensor etc.) to see if you can identify a culprit. That requires time and lots of replacement parts. It’s a great learning experience though. In the end, you initial assumption is probably the best one…have it looked at by a shop :>).