Solution: iPhone 7 won’t turn on and WIFI failure after dropping

Here is an iPhone 7 won't turn on after dropping, the iPhone motherboard is damaged, and there is a short-circuited problem, we can get a solution here!

First, try to power up, we found a large current leakage, and continue to test by digital multimeter , we know the 3V power supply short circuit. Observe seriously, the motherboard card slot position is bent, and the short circuit may be in this position. Remove the two capacitors next to the NAND flash by QUICK 861DW Hot Rework Station  and power on, the phone turn on normally.

 Test function after turned on, we found no Wifi, sometimes stuck when enter the settings. When check, the Wifi clock signal R0807 end has 1.8V, the other end through the Wifi module 17 pin have no voltage, we replace the resistor, but the fault remains. Remove the iPhone Wifi IC, the soldering pad drop the point.

Originally, we plan to turn on phone without install the Wifi module,  and test its function. But there is leakage when power-up, we have to apply rosin. After removing the heating capacitor and test, the setting function is normal, no longer stuck, next install the WiFi module.

Assemble the iPhone 7, power on iPhone, after entering the IOS system, test the iPhone WIFI function, the iPhone WIFI function is working. Continue to test the ohter functions, all works good. The repairs end!