A buyer despatched us an iPhone 6S to restore, the issue is that iPhone 6S failed to boot after water damaged, and this iPhone 6S was once repaired through different restore guy, however nonetheless no longer turning on, he need us can assist him to clear up this drawback.
After we gained the iPhone 6S, first dissemble iphone with iPhone opening device , we noticed that the motherboard was once flooded with water, we wiped clean the water space totally, it kind of feels that CPU Upper additionally exist fault. After examined resistance and powered on, there’s no brief circuit. Connect the iphone motherboard to the DPS DC energy provide, we discover the present price is set 240MA.
Test PP-VCC-MIAN with a virtual multimeter , exist phenomenon of brief circuit, the resistance is small, most effective dozens of ohms. Observe sparsely, we discovered that capacitor subsequent to the WIFI chip was once black significantly.
Use QUICK 861DW Hot Air Station to take away the capacitor, resistance is examined greater than 100 ohms, and the present measured could also be greater than 100 mA. Due to the massive water poured space, it was once discovered capacitor at the iPhone audio IC additionally become black significantly, we will be able to test iPhone schematic diagram by means of WUXINJI Dongle.
After taking out the capacitor, measure PP-VCC-MIAN, then insert the DC energy provide once more, the present turn into greater than 30 mA. Test more than one energy provide, there’s no brief circuit, attach to the ability provide, we really feel a slight warmth. So fumigate rosin within the higher phase. It was once discovered that energy provide portion was once warmer than different portions. After taking out the show energy, the present returns to customary.
Remove the iPhone energy IC, take a look at the iPhone motherboard once more, now all knowledge examined are customary.
Assemble the iPhone, press the iPhone energy button, the iPhone 6S will also be became on effectively now. After coming into the IOS, take a look at all purposes on iPhone 6S, all works neatly, the issue has been solved!