Get real solution for iPhone 6S won’t turn on disease

The customer sent an damaged iPhone 6s to us for repairing, he just said the the iPhone 6s won't turn on. After we check it by Fluke 15B+ Digital Multimeter, we found deeper problems.

Trouble details as followers:

When we press the boot button there is a large current of 500mA, it is leakage caused iPhone 6s won't turn on.

Repair process

AS we know, the reason why the iPhone power supply IC or power supply tube is hot is not necessarily that it's broken; mostly it is caused by the leakage or short circuit of the rear load. We can understand it like this, our home switch is hot, and usually it is caused by our home appliances burned out after the leak.

After seeing the ammeter, the first thing we think about is not the iPhone battery voltage leakage, nor the power supply of VCC. After pressing the power button to appear large current is caused by the power supply load in the leakage or short circuit.

First we use a Temperature-sensing method to feel the iPhone where the temperature is higher. After checking, we preliminary judgment the temperature is obviously high near the fingerprint line. Now we're going to check exactly which part is wrong. We can check the iPhone circuit diagram on WUXINJI Dongle.

Through the soldered Rosin method, we found that the 3D touch tube was obviously hot. This time we have an idea that this is not necessarily a problem with the power supply tube. When we first started repairing the 6 generation VCCMAIN short circuit issue, we found that the electronic switch hot obvious, at first we thought it was broken, but it is not. Anyway, remove the 3D-TOUCH power supply pipe first. After that, provide power to it to test, the iPhone 6S now can be turned on.

The problem was found, but a 3D-TOUCH was not powered. At this point, we're looking for a voltage close to 2.75V near it. The closest to it and nearest 2.75V is the fingerprint 3.0V voltage. When we connect to the 3.0V voltage, the iPhone again shows a large current of 500mA. Now we have an idea, it's not the power supply pipe problem, but the load short circuit. Now, we need to use QUICK 861DW Hot Air Rework Station to solder rosin again.And then we found the culprit, which is a small capacitor.

Directly remove the small capacitor by Precision Titanium Alloy Tweezers. Finally we install the iPhone 6s well, and then press the iPhone power button, the iPhone 6s can be turned on now. Keep testing, the 3D-TOUCH also can work now.The repairs end!