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Saturday 16 May, 2020 |

Fixed: iPhone X doesn't boot after dropping

The iPhone X fell to the ground heavily, the iPhone X rear case is broken, the worst is that the iPhone X doesn't boot anymore, the iPhone X display screen is good. When press the power button, the iPhone X doesn't respond, it doesn't boot, we need to fix it.

Use screwdriver to remove the screws at the bottom of the iPhone screen, put the iPhone X on the CPB screen separator for heating, after a while, use screen pry tools and sucker to open the iPhone screen.

Remove the iPhone X display assembly, disconnect the iPhone X battery, and then take off the iPhone X motherboard.

Put the iPhone X motherboard under a microscope to observe, the iPhone X motherboard looks good, but the layers are disconnected and the middle frame is up.

Connect the iPhone X motherboard to a DC power supply to measure the current, the boot current stucker on about 30mA, which abnormal, the iPhone X CPU can't be activated by this current，so the iPhone X won't turn on.

Place the iPhone X motherboard to the SS-T12A heating station to separate the layers, heat for 2 or 3 minutes, use tweezers to take off the iPhone X upper layer, and then take off the iPhone X lower layer. Observing them under a microscope, there are many pins missing.

Use soldering iron to remove the pins on the lower layer, after cleaning; the iPhone X lower layer looks good.

Now we need to handle the iPhone X upper layer. Because the iPhone X upper layer is damaged seriously, we are going to swap the board, so we need to swap the iPhone CPU, iPhone Nand flash and iPhone logic eeprom IC.

Attach the iPhone X upper layer to the PCB holder fixture, first use hot air gun and BGA removal blade to remove the iPhone CPU, there are many pins of the iPhone CPU also missing.

Put the iPhone X CPU on the PCB holder fixture, apply some solder paste to the CPU, use soldering iron to clean it, and then use hot air gun to reball the iPhone CPU.

Next we need to remove the iPhone Nand flash, and then reball the iPhone Nand flash. Now remove the iPhone eeprom IC, and then reball it.

Apply some solder paste to the new iPhone X upper layer, and then install the iPhone Nand flash, iPhone CPU and iPhone eeprom IC in turn.

Once done, cooling the motherboard and then measure it by DC power supply, the current measured is normal. Now install the iPhone X layers to the qianli iSocket test fixture, and connect the iPhone screen and battery, the iPhone X screen lights up normally.

Reballing the iPhone X middle frame, install the iPhone X motherboard double layers, and then assemble the iPhone X. Press the iPhone X power button, the iPhone X is turned on smoothly, the problem has been fixed!

This video was shared by 温州艾奥科技.

by Bellin

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