原帖由： Minho ,
Considering all the tests you did, the only real option left is a logic board issue and boot loopers are the hardest to diagnose. One thing you can try is to look carefully along the edge of the logic board to see if there are any damaged components (preferably under magnification). The 5 series devices are prone to pry damage, especially when replacing batteries and in some cases, this can cause boot loops. If you really want to save this phone, then it will need to be looked at by an experienced micro-solderer.