How to Fix IPhone 6 Recording Fault Repair

Audio problems with this Apple device have emerged in distinct scenarios. Some users aren’t hearing any alert sound when a new message comes in, intermittent sound alerts, and worst, no sound at all.

If you’ve been looking for remedies to any of these relevant issues over the Internet and have come across this page, then I suggest you keep reading the entire content as it features possible solutions and workarounds that could help you deal with this trouble.

Customers deliver a iPhone6 without recording sound function.

First of all, replace the U0900 audio frequency chip, we need to make sure whether U0900 is damaged, after replacing it and reinstalling the iPhone 6, the recording function fault is still not solved yet. 

For a motherboard like this, it didn't get water in before, so we can only consider that the bottom of the board is broken, take off U0900 to measure the resistance value of the bottom pin by Fluke digital multimeter, it is found that the big audio A9 pin has no resistance value. Picture 1

This pin is a clock synchronization signal given to u0900 by the iPhone 6 CPU through the R0301 resistance, and if the circuit is broken, the cell phone will record without voice.  

This kind of fault must be processed by fly jumper wire and directly from this resistor to the big audio A9 pin. Picture 2

You need to pay attention that the big audio requires very thin jumer wire(VC507) to avoid the installation of big audio too high or solder connection situation, after flying the jumper wire, you can use green oil solidification, the details will depend on your own skills.

Test the iPhone 6 function after reassembly, the recording fault is solved successfully now.