iPhone 6 has no service regularly and no IMEI Guide

 iPhone 6 has no service regularly and no IMEI Guide

Trouble Phenomenon

IPhone 6 doesn’t have service and doesn’t show IMEI when dialing *#06#.

Repair Process

Checking “settings”→ “general” → “about phone” after power on，there is IMEI. But there is no IMEI when dialing*#06# at the dialing interface. Repeating power on several times, sometimes there is IMEI. This kind of trouble is called *#06# no IMEI. Usually, this is caused by the troubles of RFFE1 and RFFE2 serial of the baseband. The two serials are used by baseband CPU to control the signal chips. The place of RFFE1 is  ZXW DONGLE circuit diagram in the picture 1-4 and in the circuit diagram 1-5

                                                   picture 1-4

Circuit diagram(电路图) 1-5


Dropped iPhones have such phenomenon because RFFE1_DATA (picture 1-5) Charging Cable is broken at the bottom of U1. After teardown the baseband, using an enameled wire connects the test point at the back. RFFE1_DATA material object testing point is shown in the picture 1-6.



After jump wire Cutting cable connects the test point at the back, then smearing Green UV Fluxes Oil and assembling the baseband, as is shown in the picture 1-7 and picture 1-8.

                                       
                                                  picture 1-7

                                                    picture 1-8
Assembling the motherboard to the assembly, then power on, “no-service” doesn't appear any more after testing for several days. The trouble is removed.

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