How to fix iPhone X Booting problem: Repairing Guide
There are many reasons when you are not able to boot your iPhone X normally. Regardless of this problem. You must use the DC power to measure the current flow. In this way, you know the problem before it is set to repair. How you can troubleshoot and repair the iPhone would not boot.
Take the function test:
Firstly, you should connect the iPhone X motherboard to the DC power supply and boot up yet. The booting current jumps directly to 800 Ma, when you trigger the boosting. The normal current is normally caused by a short circuit of a power supply. You can disconnect the power and use the heat to separate the motherboard.
You can buckle the upper layer of the motherboard to a screen assembly and connect to the DC supply. When you boot up and take a test. The iPhone boots up in a proper way and the booting current shows normal too. The upper layer of the motherboard is proven to work normally. The problem is that the iPhone is not booting from the bottom layer of the motherboard, which needs to be troubleshot next.
You can also measure the diode resistance of the power supply output. The diode resistance is 1.8V indicator. According to the Schematic, there are many components in the bottom layer. The motherboards use a 1.8V power supply. You can use burn in the test. The methods of the rosin narrow the range.
The repairer slips the bottom with the ground wire and adjusts the voltage to 1.8V for burn in the test. You can use the rosin method to troubleshoot the components. The rosin of the capacitor C2414-E melts firstly.
You can scrape off the black sticker, where the rosin melts, then you can remove the capacitor. You can also measure the diode resistance of 1.8V power supply with the multimeter. The diode resistance shows normally. You can clean the motherboard with the PCD cleaner. It resembles the motherboard and makes it cool for 5 minutes.
Assemble and test:
You can find the buckle of an iPhone X screen assembly, you can connect to the DC supply and make a test. IPhone display works in a proper way.
Tools and Materials Used
· DC Power Supply
· Heating platform
· Knife blade
· Soldering iron
· PCB cleaner
· Solder flux paste