iPhone 6 Plus screw column and chip disconnection can not be turned on

Machine model: iPhone 6 Plus
Malfunction: no booting, the customer’s reaction fell, turn on Restart repeatedly, remove the screen and put it back on, and it will be no booting.
Failure analysis: According to the customer’s reaction,Screw hole may be broken through.
Maintenance process: Connect DC power supply to see current change’ s abnormality, disassemble the machine and observe under microscope that there are screw marks on the right Screw hole.

iPhone 6 Plus screw column and chip disconnection can not be turned on Figure 1.

Scratch the screw mark with a blade and repair it with poor line repairing.

iPhone 6 Plus screw column and chip disconnection can not be turned on Figure 2.

This one is i2c bus. According to the customer’s description, the data should not be Update System, and the fault point can only be roughly judged according to the description, which should be logical EEPROM disconnection or Inveracious Soldering. Cut off the cover of logic EEPROM EEPROM and measure logic EEPROM B1/B2 EEPROM. When B2 Update System 24101 Update System 2401 is too large,Inveracious Soldering should be disconnected.