Fixed: iPhone 6 has no sound in recording mode

The iPhone 6 has no sound when it in recording mode, it just keep silence. After troubleshooting the software failure, we start to check iPhone logic board, and then fix it.

Carefully disassemble the iPhone 6 by phone opening tools, and then replace the new iPhone u0900 big audio IC. After replacement, test the iPhone 6, the iPhone still no sound when it in recording mode.

Disassemble the iPhone, remove the iPhone motherboard, and u0900, and then use digital multimeter to measure the resistance value of the bottom pin, there is no resistance value on the iPhone big audio IC A9 pin.

As we know, 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.

Put iPhone under the Stereo Zoom Microscope, and then use QUICK 861DW to solder the jumper wire between this resistor and big audio A9 pin.

After soldering, assemble the iPhone, turn on iPhone 6 to test the iPhone recording function, now the sound can be recorded properly. The iPhone 6 no sound in recording mode problem has been fixed!