Post originale di: HAKU_LYU ,
Judging by what we have learned during the teardown of Face ID, main circuits of the Face ID are exposed. Once water damaged or exposed to a relatively humid environment, there might be electricity leakage or short-circuit problem that can result in Face ID failure. [guide|128388] And for a detailed repair process, Face ID parts are complicated and difficult to repair. A simple replacement can not fix the problem, not to mention that most Face ID parts are paired to the logic board. You need professional help.