iPhone 6 No voice call, trouble shooting.

iPhone 6 passed without sound, often no serviecs, but still no serviecs after replacing 2G power amplifier. Then, after checking that the mobile phone has an operator, according to the previous maintenance experience, we can receive the operator's explanation that the receiving signal part of the mobile phone is good, and the problem should lie in the transmitting part. Then, a large RF is replaced, and the signal is OK after replacing the large RF.

iPhone No voice call, trouble shooting.

Machine model: iPhone 6. Malfunction phenomenon: there is no sound when the mobile phone passes, often no serviecs.Maintenance process:

Get a iPhone 6-generation phone earpiece hands-free and silent, with microphone, which often breaks down no serviecs. get the phone to record with voice function and play earpiece sound. then the line from coder to earpiece is good. Troubleshoot coder. the problem lies in the fact that microphone signal from earpiece CPU to coder has problems. the board has been touched by earpiece CPU and Baseband has been repaired.Then, nine times out of ten, the problem lies in Baseband. After picking up SMD REWORK STATION and removing Baseband CPU, many empty points were found.

iPhone 6. Maintenance of passing without sound Figure 1.
If so many empty points are dropped, the machine is probably dropped. After a closer look, two useful points are dropped. Under the microscope, replace u1 pin v1 pin of pad break off with pin, coat Solder Mask and install Baseband CPU.
Turn on no serviecs, because it can be confirmed that Baseband CPU is installed without problems. therefore, according to the maintenance experience, after replacing Baseband CPU,no serviecs will choose to replace 2G Baseband and 2G Baseband.

iPhone 6 passes through no serviecs without sound. troubleshooting figure 2.

After the 2G power amplifier was replaced, it was still no serviecs. Then I checked that the mobile phone had an operator. According to the previous maintenance experience, I was able to receive the operator’s explanation that the receiving signal part of the mobile phone was good, and the problem should lie in the transmitting part. Then I replaced a large RF, as shown in the following figure:

iPhone 6 passes no sound fault maintenance figure 3.
After the replacement of RF, the signal was OK, and all the calls were normal. At this point, the iPhone6 mobile phone passed the sound failure repair.