The copper sheet in the socket is too loose, causing the plug and socket to not be in good contact, generating a spark, the resulting sizzling sound, this is not the sound of current, must replace the socket, to ensure safety! The mobile phone has been used for a long time, the charging interface is loose, and the optimization plan of power failure is touched. Like the author millet 2s, that is, the interface is loose, touch it can not be powered on, and then the Internet to see the interface and the motherboard as one, the replacement cost is too large, and finally the Internet to find a small cost of the program to share with you, the pro test effect is much better than before.