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Repair Guide: iPhone 6S No Touch and CPU Short Circuit issues

A colleagues feedback me that the iPhone 6S has no touch after expand iPhone Nand flash memory storage, when we touch the iPhone display screen, it is completely unresponsive. What’s trouble? We need to repair it.



Disassemble the iPhone by phone opening tools, remove the iPhone motherboard, and then measure the diode data for iPhone touch screen with Fluke 15B+ Digital Multimeter, we found the iPhone touch screen synchronized pin is short circuit. A capacitive filter on the side of the socket, a capacitor directly connect to CPU, we can check iPhone schematic diagram on WUXINJI Dongle.


Now, we need to remove the capacitor with Precision Titanium Alloy Tweezers, after movement, measure it again, it still is short circuit. Now, we need to remove inductance,

Use QUICK 861DW hot air rework station to remove the inductance, and then measure it again with multimeter, short circuit phenomenon still exists.

The socket is short circuit, the capacitor is short circuit, and the inductance also is short circuit, we can't fix it by borrowing power from other place.

According our experience, we can try dangling touch, now test it again, it works. The iPhone 6S touch function back to normal.


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