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iPhone 7 earpiece has a murmur fault repair
Machine model: iPhone 7
Malfunction: The mobile phone earpiece has noise, so you can’t hear the other party’s voice when you call, only the current sound.
iPhone 7 earpiece has a murmur fault maintenance Figure 1.
Maintenance process: The customer changed the earpiece and the former FPC, but the phone calls are still noisy, so the fault caused by Accessories can be eliminated.earpiece is normal when the test file is playing.
iPhone 7 earpiece has a murmur fault maintenance Figure 2.
When making a call, the signal is received from ANT, which is transmitted to the main CPU through Baseband CPU, and the main CPU outputs to coder IC codec, and then to earpiece through coder power amplifier chip.
When the recording file is played, the main CPU outputs it to coder IC codec, and outputs it to earpiece through coder power amplifier chip. The most likely problem is to replace coder IC directly when it is converted into codec.
iPhone 7 earpiece has a murmur fault maintenance Figure 3.
iPhone 7 earpiece has a murmur fault maintenance Figure 4.
Installation test, call earpiece to hear the sound, no noise, return to normal, maintenance is over.
iPhone 7 earpiece has a murmur fault maintenance Figure 5.
The fault is caused by the problem of coder IC, and there is noise when calling earpiece.
