A customer have sent an damaged iPhone 6 to us, the faulty is that the iPhone is silent, which means the iPhone 6 totally no sound! No matter the Microphone or Earphone, moreover, the iPhone speaker is grey out! After checking, we have get the best solution for fix these problems.
Sound fault is the most common in cell phone
repairs, there are many chips control the sound function, so you need to be
careful to avoid more malfunction during repairs. This iPhone 6 has ringtone
sound when someone calls, but the speaker icon turns grey after connection.
First, we use the simplest elimination method
to diagnose where the fault comes from, removing the iPhone 6 Audio Flex Cable to check the receiver;
removing the earphone to test the speaker. After testing, there is still no
voice. It can be judged that the chip is out of order.
As we know, U1601 small audio water damaged phone comes out of a lot of problems, leading to large current, and there will be an automatic phone speaker. If the reset signal given by the iPhone CPU is abnormal, we can scrape and weld a jumper wire from the bottom of the chassis A6 track.
If the sound off and on, you can remove a small audio chip, when there is a temperature, measure the resistance value of the U1601 A6 track by digital multimeter.
iPhone 6 will also have a headphone mode, which automatically enters the headset mode without the plug in the headset.
The J1817 tail plug can be tested. If the block is normal, it will be solved by replacing the tail plug flex cable.
If there is the absence of a single sound instead of 3, we can replace the new parts, detect the circuit or test the block value, then basically you can find the problem.
After checking, we found the iPhone 6 U0900 big audio damage directly
caused the 3 voice failure, it's relatively simple to disassemble and assemble
large audio chip, layer welding spot is large while the iPhone audio chip is big and
thin, so it's necessary to avoid excessive force to crush the chip during
solder reballing process. We need to replace U0900 chip.
After replace the U0900 IC by QUICK 861DW, install the iPhone, and get into IOS to test, now all the sound is fine, the iPhone 6 has been repaired!
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