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iPhone6 Plus has been troubleshooting no serviecs
Machine model: iPhone6 Plus
Malfunction: the mobile phone has been no serviecs.
Fault analysis: Any chip on the RFFE bus that is damaged or not working properly will cause *#06# no IMEI.
Maintenance process: observing the motherboard under the microscope, the last family basically moved the chip on the RFFE bus, and Baseband also did it.
iPhone6 Plus mobile phone no serviecs fault maintenance Figure 1.
Baseband CPU reinstallation failure remains. It is normal to check that the ground value of RFFE bus is more than 400.
iPhone6 Plus mobile phone no serviecs fault maintenance Figure 2.
Test that RFFE bus 1.8 V VCC is normal.
iPhone6 Plus mobile phone no serviecs fault maintenance Figure 3.
It seems that we can only remove and replace all the chips that we made last time. When we removed them to U_MBPAD IF power amplifier, we found something abnormal.
iPhone6 Plus mobile phone no serviecs fault maintenance figure 4.
pad break off, make up the dropped solder joints.
iPhone6 Plus mobile phone no serviecs fault maintenance figure 5.
Replace the removed chip, boot it into the system for testing, enter #*06#IMEI on the dial surface, and the maintenance is finished.
iPhone6 Plus mobile phone no serviecs fault maintenance figure 6.
