Why my iPhone 6 has no voice during the call and no service frequently
- cnfixphone
- Sep 22, 2017
- 2 min read
You might be surprised that your iPhone 6 has no voice during the call when you turn on the speaker, but it has microphone, and it is often no service, you must be angry with that. Please don't worry it anymore, now Vip Pro Show Team can tell you the reason and solution.
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First, recording with voice function, and the earpiece has sound, so we can concluded that the circuit from audio to earpiece is fine which can exclude the problem of audio. Then the problem maybe is signal of baseband CPU sends to audio.
Check the motherboard, we can find that the baseband CPU and the IMEI was repaired, probably the problem is on the baseband CPU. Remove the baseband CPU with hot air gun, we can find that there are many pins was lost, as shown in picture 4-3-1.

Because there are many pins lost, so possibly the iPhone 6 dropped before. Check it more carefully, there are two useful pins was lost. Put motherboard under the microscope, use jump wire to solder U1 pin V1 pin, and painted with UV Solder Resist Mask, then install baseband CPU.
Power on the iPhone and show no service, we can make sure that the baseband CPU is no problem. According to the experience, after change baseband CPU but still no service, so we can choose to replace the 2G PA, as shown in picture 4-3-2

After replace the 2G PA, it's still no service, but the phone has display operator, it means the signal of receive is good, the problem maybe is in the part of the emission. So, replace the big Radio frequency, as shown in picture 4-3-3

Finally, after replace the big Radio frequency, the signal is fine, and the phone call is normal. As shown in picture 4-3-4

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