How to repair iPhone 6S receiver without sound when making a call
We received an iPhone 6S, and the customer reported that the receiver had no sound during the call and he could not hear the other side. He suspects that the iPhone speaker is broken. The client wants us to fix it.
When we turn on the speakers on the iPhone, we can't hear each other. According to our maintenance experience, the iPhone receiver has no sound, but the iPhone speaker can hear the sound. This problem is usually caused by the iPhone receiver, receiver flexible cable, receiver circuit or iPhone audio IC.
First we need to test the iPhone 6S. Turn on the iPhone 6S, go to Settings -> Sound and Touch to test the ringtone, and the tested ringtone is normal. Call someone else, the receiver has no sound, but the speakers are normal.
Now, replace the receiver and flex cable, and then test the iPhone 6S, but the failure still exist.
Use digital multimeter to measure the diode data of receiver signal 1 pin and 3 pin that on the connector J3100, the data measured are normal.
Check iPhone schematic diagram via WUXINJI Dongle, we know that the 1 pin and 3 pin of J3100 are through capacitor FL3153 and FL3154 to iPhone audio IC U3500, their diode data are normal, which means the capacitor FL3153 and FL3154 are normal.
After excluding the cause of the peripheral components，we start to check U3500. Take out the iPhone motherboard, we found the U3500 has been replaced before by other repair man, the several filter capacitors around it has been removed, and there is a power supply IC of NFC also has been removed.
Now, we need to fix iPhone receiver failure, directly replace the iPhone audio IC U3500. After replacement, connect iPhone 6S to the DC power supply, the trigger current jumps from 0 to 80mA, it's been circulating like this.
The replacement IC has been soldered well, the iPhone CPU didn't been blown by QUICK 861DW hot air rework station. Remove the iPhone audio IC, now the current is back to normal, so we confirmed that it's the problem of the iPhone audio IC. Replace it with new iPhone audio IC, and then install the iPhone.
The iPhone receiver is working properly, and the iPhone speaker also works normally.
When we turn on the speakers on the iPhone, we can't hear each other. According to our maintenance experience, the iPhone receiver has no sound, but the iPhone speaker can hear the sound. This problem is usually caused by the iPhone receiver, receiver flexible cable, receiver circuit or iPhone audio IC.
First we need to test the iPhone 6S. Turn on the iPhone 6S, go to Settings -> Sound and Touch to test the ringtone, and the tested ringtone is normal. Call someone else, the receiver has no sound, but the speakers are normal.
Now, replace the receiver and flex cable, and then test the iPhone 6S, but the failure still exist.
Use digital multimeter to measure the diode data of receiver signal 1 pin and 3 pin that on the connector J3100, the data measured are normal.
Check iPhone schematic diagram via WUXINJI Dongle, we know that the 1 pin and 3 pin of J3100 are through capacitor FL3153 and FL3154 to iPhone audio IC U3500, their diode data are normal, which means the capacitor FL3153 and FL3154 are normal.
After excluding the cause of the peripheral components，we start to check U3500. Take out the iPhone motherboard, we found the U3500 has been replaced before by other repair man, the several filter capacitors around it has been removed, and there is a power supply IC of NFC also has been removed.
Now, we need to fix iPhone receiver failure, directly replace the iPhone audio IC U3500. After replacement, connect iPhone 6S to the DC power supply, the trigger current jumps from 0 to 80mA, it's been circulating like this.
The replacement IC has been soldered well, the iPhone CPU didn't been blown by QUICK 861DW hot air rework station. Remove the iPhone audio IC, now the current is back to normal, so we confirmed that it's the problem of the iPhone audio IC. Replace it with new iPhone audio IC, and then install the iPhone.
The iPhone receiver is working properly, and the iPhone speaker also works normally.
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